WO2024065169A1 - 储能系统的控制方法、控制装置和储能系统 - Google Patents
储能系统的控制方法、控制装置和储能系统 Download PDFInfo
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- WO2024065169A1 WO2024065169A1 PCT/CN2022/121686 CN2022121686W WO2024065169A1 WO 2024065169 A1 WO2024065169 A1 WO 2024065169A1 CN 2022121686 W CN2022121686 W CN 2022121686W WO 2024065169 A1 WO2024065169 A1 WO 2024065169A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in networks by storage of energy
- H02J3/32—Arrangements for balancing of the load in networks by storage of energy using batteries or super capacitors with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
- H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/50—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries acting upon multiple batteries simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/80—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including monitoring or indicating arrangements
- H02J7/82—Control of state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/855—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/90—Regulation of charging or discharging current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/90—Regulation of charging or discharging current or voltage
- H02J7/927—Regulation of charging or discharging current or voltage with introduction of pulses during the charging process
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2101/00—Supply or distribution of decentralised, dispersed or local electric power generation
- H02J2101/20—Dispersed power generation using renewable energy sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Details of circuit arrangements for charging or discharging batteries or supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
Definitions
- the present application relates to the field of energy storage technology, and in particular to a control method, a control device and an energy storage system.
- an energy storage system connected to the energy generation system is usually provided to store excess energy.
- the energy generation system charges the energy storage system in a continuous charging manner. After a long period of charge and discharge cycles, the batteries in the energy storage system produce lithium deposition, heat generation and other phenomena, which affect the performance and service life of the batteries. Therefore, how to provide a control method for an energy storage system to improve the performance and service life of the energy storage system is a technical problem that needs to be solved urgently.
- the present application provides a control method, a control device and an energy storage system for an energy storage system, which can improve the performance and service life of the energy storage system.
- the present application provides a control method for an energy storage system, wherein the energy storage system comprises a plurality of energy storage units, the energy storage system is coupled to an energy generation system and a power grid, the energy storage system is used to store electrical energy obtained from the energy generation system and release electrical energy to the power grid, the method comprising: in a first stage, controlling the energy generation system to charge a first energy storage unit of the plurality of energy storage units, the first stage being a charging stage of a charging cycle of the first energy storage unit; and in a second stage, controlling the first energy storage unit to discharge a second energy storage unit of the plurality of energy storage units, the second stage being a discharging stage of a charging cycle of the first energy storage unit.
- the energy generation system in the first stage of the charging cycle of the first energy storage unit, the energy generation system is controlled to charge the first energy storage unit, which can make full use of the electric energy output by the energy generation system and avoid energy waste; in the second stage of the charging cycle of the first energy storage unit, the first energy storage unit is controlled to discharge to the second energy storage unit, which can reduce the lithium deposition and heating of the battery in the energy storage system, which is conducive to improving the performance and service life of the battery. Therefore, the solution of the present application can improve the performance and service life of the energy storage system.
- controlling the energy generation system to charge the first energy storage unit of the multiple energy storage units includes: in the first stage, according to the dispatching state of the power grid, the output power of the energy generation system, the charging power of the first energy storage unit, the remaining capacity of the first energy storage unit, and at least one of the remaining capacity of the second energy storage unit, controlling the energy generation system to charge the first energy storage unit of the multiple energy storage units. In this way, it is convenient to determine the strategy for the energy generation system to charge the first energy storage unit according to different usage scenarios.
- the energy generation system is controlled to charge the first energy storage unit of the multiple energy storage units according to at least one of the dispatching state of the power grid, the output power of the energy generation system, the charging power of the first energy storage unit, the remaining capacity of the first energy storage unit, and the remaining capacity of the second energy storage unit, including: when the remaining capacity of the first energy storage unit is less than the maximum preset capacity, the energy generation system is controlled to charge the first energy storage unit. In this way, the remaining capacity of the first energy storage unit can be maintained within a suitable range, avoiding overcharging caused by charging the first energy storage unit when the remaining capacity of the first energy storage unit is high.
- the energy generation system is controlled to charge the first energy storage unit of the multiple energy storage units according to at least one of the dispatching state of the power grid, the output power of the energy generation system, the charging power of the first energy storage unit, the remaining capacity of the first energy storage unit, and the remaining capacity of the second energy storage unit, including: when the dispatching state of the power grid includes the absence of energy dispatching demand, the energy generation system is controlled to charge the first energy storage unit according to the output power of the energy generation system, the charging power of the first energy storage unit, and the remaining capacity of the second energy storage unit. In this way, when there is no dispatching demand from the power grid, a strategy for charging the first energy storage unit can be determined according to corresponding information.
- the controlling the energy generation system to charge the first energy storage unit of the multiple energy storage units includes: when the output power of the energy generation system is less than the charging power of the first energy storage unit, controlling the energy generation system to charge the first energy storage unit, and controlling at least one of the second energy storage unit and the power grid to charge the first energy storage unit, wherein the remaining capacity of the second energy storage unit is greater than or equal to the minimum preset capacity.
- the second energy storage unit and/or the power grid can charge the first energy storage unit at the same time as the energy generation system in the first stage to meet the first energy storage unit's demand for charging power, thereby facilitating the extension of the service life of the first energy storage unit.
- controlling the energy generation system to charge a first energy storage unit of the multiple energy storage units includes: controlling the output power of the energy generation system to be the same as the charging power of the first energy storage unit when the output power of the energy generation system is greater than or equal to the charging power of the first energy storage unit; and after controlling the output power of the energy generation system to be the same as the charging power of the first energy storage unit, controlling the energy generation system to charge the first energy storage unit.
- the output power of the energy generation system when the output power of the energy generation system is greater than or equal to the charging power of the first energy storage unit, the output power of the energy generation system is controlled to be the same as the charging power of the first energy storage unit, and after the output power of the energy generation system is controlled to be the same as the charging power of the first energy storage unit, only the energy generation system is controlled to charge the first energy storage unit.
- This implementation can meet the demand of the first energy storage unit for charging power, which is conducive to extending the service life of the first energy storage unit; at the same time, this implementation is simple and easy to implement.
- the controlling the energy generation system to charge the first energy storage unit of the multiple energy storage units includes: when the remaining capacity of the second energy storage unit is less than the minimum preset capacity, controlling the energy generation system and/or the power grid to charge the second energy storage unit. In this way, it is convenient to flexibly select a strategy for charging the second energy storage unit according to actual conditions; in addition, after the second energy storage unit is charged to a certain amount of electricity, it is convenient to use the second energy storage unit to charge the first energy storage unit in the subsequent process.
- controlling the energy generation system and/or the power grid to charge the second energy storage unit includes: when the output power of the energy generation system is less than the charging power of the first energy storage unit, controlling the energy generation system and the power grid to charge the first energy storage unit, and controlling the power grid to charge the second energy storage unit. In this way, while charging the first energy storage unit, the second energy storage unit is also charged, so that after the second energy storage unit is charged to a suitable amount of power, the second energy storage unit can be used to charge the first energy storage unit.
- the controlling the energy generation system and/or the power grid to charge the second energy storage unit includes: when the output power of the energy generation system is equal to the charging power of the first energy storage unit, controlling the energy generation system to charge the first energy storage unit and controlling the power grid to charge the second energy storage unit; when the output power of the energy generation system is greater than the charging power of the first energy storage unit, controlling the energy generation system to charge the first energy storage unit and controlling the energy generation system and/or the power grid to charge the second energy storage unit.
- the energy generation system when the output power of the energy generation system is greater than the charging power of the first energy storage unit, the energy generation system is controlled to charge the first energy storage unit, and the energy generation system and/or the power grid are controlled to charge the second energy storage unit, including: when the difference between the output power of the energy generation system and the charging power of the first energy storage unit is less than the maximum charging power of the second energy storage unit, the energy generation system and the power grid are controlled to charge the second energy storage unit. In this way, it is convenient to realize fast charging of the second energy storage unit.
- the energy generation system is controlled to charge the first energy storage unit of the multiple energy storage units according to at least one of the dispatching state of the power grid, the output power of the energy generation system, the charging power of the first energy storage unit, the remaining capacity of the first energy storage unit, and the remaining capacity of the second energy storage unit, including: when the dispatching state of the power grid includes the existence of energy dispatching demand and the output power of the energy generation system is greater than the required power of the power grid, the energy generation system is controlled to charge the first energy storage unit according to the output power of the energy generation system, the charging power of the first energy storage unit, and the remaining capacity of the second energy storage unit.
- the energy generation system when the power grid has a dispatching demand and the output power of the energy generation system is greater than the power demand of the power grid, the energy generation system is controlled to charge the first energy storage unit. In this way, the first energy storage unit can be charged while meeting the demand of the power grid, avoiding affecting the stability of the power grid due to charging the first energy storage unit.
- the controlling the energy generation system to charge the first energy storage unit of the multiple energy storage units includes: when the remaining capacity of the second energy storage unit is greater than or equal to the minimum preset capacity, controlling the energy generation system to charge the first energy storage unit, or controlling the energy generation system and the second energy storage unit to charge the first energy storage unit.
- the second energy storage unit and/or the energy generation system can charge the first energy storage unit at the same time in the first stage to meet the first energy storage unit's demand for charging power, thereby facilitating extending the service life of the first energy storage unit.
- the controlling the energy generation system to charge the first energy storage unit of the multiple energy storage units includes: when the remaining capacity of the second energy storage unit is less than the minimum preset capacity, controlling the energy generation system to charge the second energy storage unit; after controlling the energy generation system to charge the second energy storage unit, controlling the energy generation system and/or the second energy storage unit to charge the first energy storage unit.
- the remaining capacity of the second energy storage unit can be made greater than the minimum preset capacity, so that when charging the first energy storage unit, the charging power requirement of the first energy storage unit is met.
- controlling the first energy storage unit to discharge to the second energy storage unit of the plurality of energy storage units includes: in the second stage, according to at least one of the dispatching state of the power grid and the remaining capacity of the second energy storage unit, controlling the first energy storage unit to discharge to the second energy storage unit of the plurality of energy storage units. In this way, it is convenient to flexibly set different discharge strategies of the first energy storage unit during the charging cycle according to actual conditions.
- controlling the first energy storage unit to discharge to the second energy storage unit of the plurality of energy storage units according to at least one of the dispatching state of the power grid and the remaining capacity of the second energy storage unit includes: when the remaining capacity of the second energy storage unit is less than the maximum preset capacity, controlling the first energy storage unit to discharge to the second energy storage unit. In this way, overcharging caused by excessive power received by the second energy storage unit can be avoided.
- the controlling the first energy storage unit to discharge to the second energy storage unit of the plurality of energy storage units according to at least one of the dispatching state of the power grid and the remaining capacity of the second energy storage unit includes: when the dispatching state of the power grid includes the existence of energy dispatching demand, controlling the output power of the energy generation system to be 0, and controlling the first energy storage unit to discharge to the second energy storage unit. In this way, the discharge of the first energy storage unit to the power grid can be prevented from affecting the stability of the power grid.
- the controlling the first energy storage unit to discharge to the second energy storage unit of the plurality of energy storage units according to at least one of the dispatching state of the power grid and the remaining capacity of the second energy storage unit includes: when the dispatching state of the power grid includes the existence of energy dispatching demand, controlling the output power of the energy generation system to be equal to the required power of the power grid, and controlling the first energy storage unit to discharge to the second energy storage unit.
- This implementation is simple and easy, and can simultaneously meet the demand of the power grid and the demand of the first energy storage unit to discharge to the second energy storage unit.
- the method further includes: when the charge amount of the first energy storage unit reaches a first preset capacity, controlling the first energy storage unit to switch from the first stage to the second stage; when the discharge amount of the first energy storage unit reaches a second preset capacity, controlling the first energy storage unit to switch from the second stage to the first stage. In this way, the first energy storage unit is charged by continuously switching between the first stage and the second stage during the charging cycle of the first energy storage unit.
- the method further includes: when the remaining capacity of the first energy storage unit reaches a maximum preset capacity, controlling the energy generation system to stop charging the first energy storage unit. In this way, the remaining capacity of the first energy storage unit does not exceed the maximum preset capacity, and after the energy generation system finishes charging the first energy storage unit, the first energy storage unit can be used as an energy absorption device to receive the electricity discharged by other energy storage units of the plurality of energy storage units.
- the present application provides a control device, which is coupled to an energy storage system, wherein the energy storage system is coupled to an energy generation system and a power grid, and the energy storage system is used to store electrical energy obtained from the energy generation system and release electrical energy to the power grid.
- the energy storage system includes multiple energy storage units
- the control device includes a control unit, which is used to: in a first stage, control the energy generation system to charge a first energy storage unit of the multiple energy storage units, and the first stage is a charging stage of a charging cycle of the first energy storage unit; in a second stage, control the first energy storage unit to discharge a second energy storage unit of the multiple energy storage units, and the second stage is a discharging stage of a charging cycle of the first energy storage unit.
- control unit is also used to: in the first stage, control the energy generation system to charge the first energy storage unit of the multiple energy storage units according to at least one of the dispatching status of the power grid, the output power of the energy generation system, the charging power of the first energy storage unit, the remaining capacity of the first energy storage unit, and the remaining capacity of the second energy storage unit.
- the present application provides an energy storage system, which is coupled to an energy generation system and a power grid, and is used to store electrical energy obtained from the energy generation system and release electrical energy to the power grid.
- the energy storage system includes multiple energy storage units and the control device described in the second aspect and any one of the second aspects.
- the present application provides a control device for an energy storage system, the control device comprising a memory and a processor, the memory being used to store instructions, the processor being used to read the instructions and execute the first aspect and any one of the methods in the first aspect according to the instructions.
- the energy generation system in the first stage of the charging cycle of the first energy storage unit, the energy generation system is controlled to charge the first energy storage unit, which can make full use of the electric energy output by the energy generation system and avoid energy waste; in the second stage of the charging cycle of the first energy storage unit, the first energy storage unit is controlled to discharge to the second energy storage unit, which can reduce the lithium deposition and heating of the battery in the energy storage system, which is conducive to improving the performance and service life of the battery. Therefore, the solution of the present application can improve the performance and service life of the energy storage system.
- FIG1 is a schematic diagram of an application scenario of an energy storage system in an embodiment of the present application.
- FIG2 is a schematic diagram of an architecture of an application scenario of an energy storage system according to an embodiment of the present application
- FIG3 is a schematic diagram of a control method for an energy storage system according to an embodiment of the present application.
- FIG4 is a schematic diagram of a charging cycle of a first energy storage unit according to an embodiment of the present application.
- FIG5 is a schematic diagram of a control method according to an embodiment of the present application.
- FIG6 is a schematic diagram of a control method according to an embodiment of the present application.
- FIG7 is a schematic diagram of a control device according to an embodiment of the present application.
- FIG8 is a schematic diagram of an energy storage system according to an embodiment of the present application.
- FIG. 9 is a schematic diagram of a control device according to an embodiment of the present application.
- a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
- the character "/" in this application generally indicates that the associated objects before and after are in an "or" relationship.
- an energy storage system connected to the energy generation system is usually set up to store excess energy.
- the energy generation system charges the energy storage system in a continuous charging manner. After a long period of charge and discharge cycles, the batteries in the energy storage system produce lithium deposition, heat generation and other phenomena, affecting the performance and service life of the batteries.
- the present application provides a control method for an energy storage system, wherein the energy storage system includes multiple energy storage units, the energy storage system is coupled with an energy generation system and a power grid, and the energy storage system is used to store electrical energy obtained from the energy generation system and release electrical energy to the power grid.
- the control method includes: in a first stage, controlling the energy generation system to charge the first energy storage unit of the multiple energy storage units, and the first stage is the charging stage of the charging cycle of the first energy storage unit; in a second stage, controlling the first energy storage unit to discharge to the second energy storage unit of the multiple energy storage units, and the second stage is the discharging stage of the charging cycle of the first energy storage unit.
- the first energy storage unit is charged to a certain amount of electricity in the first stage of the charging cycle, and then discharges to the second energy storage unit in the second stage, thereby reducing the occurrence of lithium plating and heating of the battery of the first energy storage unit in the energy storage system, which is beneficial to improving the performance and service life of the battery, thereby improving the performance and service life of the energy storage system.
- FIG. 1 is a schematic diagram of an application scenario of an energy storage system according to an embodiment of the present application.
- the energy generation system 120 is connected to the energy storage system 110 and the power grid 130 , and the energy generation system 120 can transmit power to the energy storage system 110 and the power grid 130 .
- the energy generation system 120 can convert solar energy, wind energy, nuclear energy, etc. into electrical energy.
- the energy generation system 120 is a renewable energy system such as a wind power generation system, a photovoltaic power generation system, or a tidal power generation system, or a nuclear power generation system, a thermal power generation system, or a hydropower generation system, or a power generation system that combines a wind power generation system and a thermal power generation system. This application does not limit the power generation form of the energy generation system 120.
- the energy storage system 110 is used to store electric energy, and the energy storage system 110 may include multiple energy storage units.
- each energy storage unit may include at least one battery, and a battery management system (BMS) is designed in each energy storage unit to monitor battery information such as the state of charge (SOC), temperature, current, voltage, and state of health (SOH), and to interact with the upper-level energy management system (EMS) or power conversion system (PCS) in real time to achieve energy management of the entire energy storage system 110.
- SOC state of charge
- SOH state of health
- EMS upper-level energy management system
- PCS power conversion system
- a battery may include a plurality of battery cells, which are connected in series, in parallel or in mixed connection to form a battery.
- a battery cell may be the smallest unit of a battery.
- the energy storage system 110 may also output power to an electrical device, which may be an electric vehicle or the like.
- the energy storage system 110 is connected to a power grid 130.
- the power grid 130 may be a distribution grid, a regional grid, or a power supply grid, which is not limited in this application.
- the power grid 130 may receive power output by the energy storage system 110, or may transmit power to the energy storage system 110.
- the power grid 130 may also be replaced by user-side electrical equipment, which may not output power to the energy storage system 110.
- the user-side electrical equipment may receive power output by the energy storage system 110 and/or the energy generation system 120.
- the energy storage system 110 is connected to the energy generation system 120, the energy storage system 110 is connected to the power grid 130, and the energy generation system 120 is connected to the power grid 130. It can also be understood that the energy storage system 110 is coupled to the energy generation system 120, the energy storage system 110 is coupled to the power grid 130, and the energy generation system 120 is coupled to the power grid 130.
- Fig. 2 is a schematic diagram of the architecture of an application scenario of an energy storage system according to an embodiment of the present application.
- the energy generation system 120 is illustrated as a photovoltaic power generation system as an example. It should be noted that the energy generation system 120 is not limited to a photovoltaic power generation system.
- the output power of the energy generation system 120 is the power output after passing through the first controller.
- the first controller may be a maximum power point tracking solar controller (MPTT), which may control the output power of the energy generation system 120 and may also control whether the energy generation system 120 outputs power to the energy storage system 110 or the power grid 130.
- MPTT maximum power point tracking solar controller
- the power of the energy generation system 120 is output to the bus 140 through the MPPT, which means that the energy generation system 120 may output direct current to the bus 104 under the control of the MPPT.
- the power output by the grid 130 can be output to the bus 140 through an alternating current-direct current (AC/DC) converter.
- the AC/DC converter is a bidirectional AC/DC converter that can support a fast charge/discharge switching function.
- the AC generated by the grid 130 can be converted into DC through a bidirectional AC/DC converter and then output to the bus 140.
- the energy storage system 110 includes a plurality of energy storage units, each of which includes a battery and a direct current-direct current (DCDC) converter.
- the DCDC converter is a bidirectional DCDC converter that can support a fast charge and discharge switching function, and can also convert the size of the current or power to meet the charge and discharge power of the battery.
- Each energy storage unit can output power to the bus 140 through DCDC, and can also output power to other energy storage units through DCDC.
- the current or power of the bus 140 can also be transmitted to each energy storage unit through DCDC.
- the charging or discharging of the energy storage unit can be turned on and off by controlling the DCDC converter.
- the DCDC converter may be an isolated DCDC converter or a non-isolated DCDC converter.
- Fig. 3 is a schematic diagram of a control method for an energy storage system according to an embodiment of the present application.
- the control method 300 includes the following steps.
- the control method 300 of the embodiment of the present application is applicable to the energy storage system 110 shown in Figures 1 and 2.
- the energy storage system 110 is coupled to the energy generation system 120 and the power grid 130.
- the energy storage system 110 is used to store the electrical energy obtained from the energy generation system 120 and release the electrical energy to the power grid 130.
- the energy storage system 110 includes multiple energy storage units.
- the control method 300 of the embodiment of the present application is executed by a control device, which can be set in the energy storage system 110, or in the energy generation system 120, or can be independently set outside the energy storage system 110 and the energy generation system 120.
- the specific setting of the control device can be specifically set according to actual conditions, and the embodiment of the present application does not specifically limit this.
- Step 310 In the first stage, the energy generation system 120 is controlled to charge the first energy storage unit 111 of the plurality of energy storage units.
- the first stage is the charging stage of the charging cycle of the first energy storage unit 111 .
- step 310 may be implemented by the following operations.
- the control device controls the MPPT to output the power of the energy generation system 120 to the bus 140 , and then the control device controls the DCDC in the first energy storage unit 111 to convert the direct current on the bus 140 side into a charging current of the first energy storage unit 111 and output the current to the first energy storage unit 111 .
- step 310 the energy generation system 120 is controlled to charge the first energy storage unit 111, so as to fully utilize the electric energy generated by the energy generation system 120 and avoid energy waste.
- Step 320 In the second stage, the first energy storage unit 111 is controlled to discharge to the second energy storage unit 112 of the plurality of energy storage units.
- the second stage is the discharge stage of the charging cycle of the first energy storage unit 111 .
- step 320 may be implemented by the following operations:
- the control device controls the DCDC of the first energy storage unit 111 and the DCDC of the second energy storage unit 112 to turn on, so as to output the power of the first energy storage unit 111 to the second energy storage unit 112 .
- FIG4 is a schematic diagram of a charging cycle of the first energy storage unit of an embodiment of the present application.
- the charging cycle of the first energy storage unit 111 includes a plurality of first stages and second stages that appear in sequence.
- the first energy storage unit 111 is charged to replenish the power of the first energy storage unit 111.
- the second stage the first energy storage unit 111 is discharged to reduce or eliminate the polarization accumulation of the battery in the first energy storage unit 111, thereby reducing the generation of lithium plating and reducing the heat accumulation caused by charging the first energy storage unit 111.
- the charging power of the first energy storage unit 111 may be different, and the amount of electricity replenished may also be different, which can be determined by the BMS according to the battery information of the battery of the first energy storage unit.
- the discharge power and the amount of electricity discharged of the first energy storage unit 111 may also be different.
- durations of different first stages and different second stages may be the same or different, and these may be specifically set according to actual conditions.
- controlling the first energy storage unit 111 to discharge to the second energy storage unit 112 can reduce the generation of lithium deposition and heating of the battery in the energy storage system 110, which is beneficial to improving the performance and service life of the battery.
- controlling the first energy storage unit 111 to discharge to the power grid 130 is easier to implement, has less impact on the power grid 130, and does not affect the stability of the power grid 130.
- the embodiment of the present application provides a control method 300.
- the energy generation system 120 is controlled to charge the first energy storage unit 111 of the multiple energy storage units, and the first stage is the charging stage of the charging cycle of the first energy storage unit 111; in the second stage, the first energy storage unit 111 is controlled to discharge the second energy storage unit 112 of the multiple energy storage units, and the second stage is the discharging stage of the charging cycle of the first energy storage unit 111.
- the electric energy generated by the energy generation system 120 can be fully utilized to avoid energy waste, and the occurrence of lithium plating and heat generation of the battery in the energy storage system 110 can be reduced, which is beneficial to improving the performance and service life of the battery. Therefore, the solution of the present application can improve the performance and service life of the energy storage system 110.
- the first energy storage unit 111 may be controlled to charge the first energy storage unit 111.
- the first energy storage unit 111 may be charged by other energy storage units to heat the battery of the first energy storage unit 111.
- Fig. 5 is a schematic diagram of a control method according to an embodiment of the present application.
- step 310 includes step 311 .
- Step 311 In the first stage, the energy generation system 120 is controlled to charge the first energy storage unit 111 of the multiple energy storage units according to the dispatching status of the power grid 130, the output power of the energy generation system 120, the charging power of the first energy storage unit 111, the remaining capacity of the first energy storage unit 111 and at least one of the remaining capacity of the second energy storage unit 112.
- the charging power of the first energy storage unit 111 can be determined based on the battery information of the battery in the first energy storage unit 111.
- the battery information may include the voltage of each battery cell in the battery, the temperature of the battery cell, the SOH of the battery cell and the battery, the SOC of the battery cell and the battery, etc.
- the BMS in the first energy storage unit 111 can determine the charging current and charging power of the first energy storage unit 111 based on the battery information. For example, the BMS can obtain the battery information in real time and determine the most suitable charging power for the first energy storage unit 111 based on the battery information.
- the charging power can be sent to the control device.
- the BMS sends the charging power to the control device through a controller area network (CAN) communication method.
- CAN controller area network
- the output power of the energy generation system 120 is the power at the output side of the energy generation system 120, for example, the output power at position a in Figure 2.
- the output power of the energy generation system 120 may be controlled by a first controller, such as an MPPT.
- the remaining capacity of the first energy storage unit 111 and the remaining capacity of the second energy storage unit 112 refer to the SOC of the first energy storage unit 111 and the SOC of the second energy storage unit 112 , respectively.
- the strategy for the energy generation system 120 to charge the first energy storage unit 111 based on information such as the dispatching status of the power grid 130, the output power of the energy generation system 120, the charging power of the first energy storage unit 111, the remaining capacity of the first energy storage unit 111 and the remaining capacity of the second energy storage unit 112.
- step 311 includes: when the remaining capacity of the first energy storage unit 111 is less than the maximum preset capacity, controlling the energy generation system 120 to charge the first energy storage unit 111.
- the maximum preset capacity may be the maximum SOC of the battery of the first energy storage unit 111 , and the SOC may be specifically set according to actual needs, for example, the SOC is 0.8, 0.9, etc.
- the remaining capacity of the first energy storage unit 111 can be maintained within a suitable range, thereby avoiding overcharging caused by charging the first energy storage unit 111 when the remaining capacity of the first energy storage unit 111 is high.
- Fig. 6 is a schematic diagram of a control method according to an embodiment of the present application.
- step 311 includes step 312 .
- Step 312 When the dispatching state of the power grid 130 includes the absence of energy dispatching demand, the energy generation system 120 is controlled to charge the first energy storage unit 111 according to the output power of the energy generation system 120 , the charging power of the first energy storage unit 111 and the remaining capacity of the second energy storage unit 112 .
- the dispatching state of the power grid 130 includes a situation where there is no energy dispatching demand, it can be that at this time, the power grid 130 does not need the energy generation system 120 and the energy storage system 110 to transmit power to the power grid 130 .
- the strategy for charging the first energy storage unit 111 when there is no scheduling demand from the power grid 130, it is convenient to determine the strategy for charging the first energy storage unit 111 based on the relationship between the output power P2 of the energy generation system 120 and the charging power P1 of the first energy storage unit 111, and the remaining capacity of the second energy storage unit 112.
- step 312 includes: when the output power of the energy generation system 120 is less than the charging power of the first energy storage unit 111, controlling the energy generation system 120 to charge the first energy storage unit 111, and controlling at least one of the second energy storage unit 112 and the power grid 130 to charge the first energy storage unit 111, wherein the remaining capacity of the second energy storage unit 112 is greater than or equal to the minimum preset capacity
- the minimum preset capacity may be specifically set according to actual needs.
- the SOC of the battery in the second energy storage unit 112 corresponding to the minimum preset capacity of the second energy storage unit 112 is 0.5.
- the second energy storage unit 112 can be used as an energy supplement device to charge the first energy storage unit.
- the output power of the energy generation system 120 is less than the charging power of the first energy storage unit 111, in addition to the energy generation system 120, other devices are required to charge the first energy storage unit 111.
- the energy generation system 120 and the power grid 130 charge the first energy storage unit at the same time, which is more economical.
- the energy generation system 120 and the second energy storage unit 112 charge the first energy storage unit 111 at the same time, and the power grid 130 does not charge the first energy storage unit 111.
- the power grid 130 does not need to charge the first energy storage unit 111, and the charging strategy is simple and easy, and will not affect the normal operation and stability of the power grid 130.
- the energy generation system 120, the power grid 130 and the second energy storage unit 112 charge the first energy storage unit 111 simultaneously.
- the control device controls the first controller, such as the MPPT, to output the output power of the energy generation system 120 to the bus 104; the control device controls the DCDC of the second energy storage unit 112 to output the power of the second energy storage unit 112 to the bus 104; the control device controls the AC/DC to output the power of the power grid 130 to the bus 104; the control device controls the DCDC of the first energy storage unit 111 to convert the power (direct current) on the bus 104 side and output it to the first energy storage unit 111.
- the first controller such as the MPPT
- the control device controls the DCDC of the second energy storage unit 112 to output the power of the second energy storage unit 112 to the bus 104
- the control device controls the AC/DC to output the power of the power grid 130 to the bus 104
- the control device controls the DCDC of the first energy storage unit 111 to convert the power (direct current) on the bus 104 side and output it to the first energy storage unit 111.
- the second energy storage unit 112 and/or the power grid 130 can charge the first energy storage unit 111 in the first stage simultaneously with the energy generation system 120 to meet the first energy storage unit 111's demand for charging power, thereby facilitating extending the service life of the first energy storage unit 111.
- step 312 includes: when the output power of the energy generation system 120 is greater than or equal to the charging power of the first energy storage unit 111, controlling the output power of the energy generation system 120 to be the same as the charging power of the first energy storage unit 111; after controlling the output power of the energy generation system 120 to be the same as the charging power of the first energy storage unit 111, controlling the energy generation system 120 to charge the first energy storage unit 111.
- the output power of the energy generation system 120 when the output power of the energy generation system 120 is greater than or equal to the charging power of the first energy storage unit 111, the output power of the energy generation system 120 is controlled to be the same as the charging power of the first energy storage unit 111, and after the output power of the energy generation system 120 is controlled to be the same as the charging power of the first energy storage unit 111, only the energy generation system 120 is controlled to charge the first energy storage unit 111. In this way, the demand for charging power of the first energy storage unit 111 can be met, which is conducive to extending the service life of the first energy storage unit 111; at the same time, the implementation method is simple and easy to implement.
- step 312 includes: when the remaining capacity of the second energy storage unit 112 is less than the minimum preset capacity, controlling the energy generation system 120 and/or the power grid 130 to charge the second energy storage unit 112.
- step 312 includes: when the remaining capacity of the second energy storage unit 112 is less than the minimum preset capacity, controlling the energy generation system 120 and/or the power grid 130 to charge the second energy storage unit 112.
- the energy generation system 120 and/or the power grid 130 are controlled to charge the second energy storage unit 112, including: when the output power of the energy generation system 120 is less than the charging power of the first energy storage unit 111, the energy generation system 120 and the power grid 130 are controlled to charge the first energy storage unit 111, and the power grid 130 is controlled to charge the second energy storage unit 112.
- the second energy storage unit 112 while charging the first energy storage unit 111 , the second energy storage unit 112 is also charged, so that after the second energy storage unit 112 is charged to a suitable amount of power, the first energy storage unit 111 can be charged using the second energy storage unit 112 .
- the energy generation system 120 and the power grid 130 are controlled to only charge the first energy storage unit 111 and not charge the second energy storage unit 112 .
- the energy generation system 120 and/or the power grid 130 are controlled to charge the second energy storage unit 112, including: when the output power of the energy generation system 120 is equal to the charging power of the first energy storage unit 111, the energy generation system 120 is controlled to charge the first energy storage unit 111, and the power grid 130 is controlled to charge the second energy storage unit 112; when the output power of the energy generation system 120 is greater than the charging power of the first energy storage unit 111, the energy generation system 120 is controlled to charge the first energy storage unit 111, and the energy generation system 120 and/or the power grid 130 are controlled to charge the second energy storage unit 112.
- the energy generation system 120 when the output power of the energy generation system 120 is greater than the charging power of the first energy storage unit 111, the energy generation system 120 is controlled to charge the first energy storage unit 111, and the energy generation system 120 and/or the power grid 130 are controlled to charge the second energy storage unit 112, including: when the difference between the output power of the energy generation system 120 and the charging power of the first energy storage unit 111 is less than the maximum charging power of the second energy storage unit 112, the energy generation system 120 and the power grid 130 are controlled to charge the second energy storage unit 112. In this way, it is convenient to realize the rapid charging of the second energy storage unit 112.
- step 311 includes: when the dispatching state of the power grid 130 includes the existence of an energy dispatching demand and the output power of the energy generation system 120 is greater than the required power of the power grid 130, controlling the energy generation system 120 to charge the first energy storage unit 111 according to the output power of the energy generation system 120, the charging power of the first energy storage unit 111 and the remaining capacity of the second energy storage unit 112.
- the power grid 130 has an energy dispatching demand, wherein the power grid 130 may send the energy dispatching demand to at least one of the energy generation system 120 and the energy storage system 110.
- the power grid 130 preferentially sends the energy dispatching demand to the energy generation system 120.
- the power grid 130 may also send the dispatching demand to the energy storage system 110.
- the energy generation system 120 is controlled to charge the first energy storage unit 111.
- the first energy storage unit 111 can be charged while the demand of the power grid 130 is met, thereby avoiding the situation where the demand of the power grid 130 cannot be met due to the charging of the first energy storage unit 111, thereby avoiding affecting the stability of the power grid 130.
- controlling the energy generation system 120 to charge the first energy storage unit 111 of the plurality of energy storage units includes: when the remaining capacity of the second energy storage unit 112 is greater than or equal to the minimum preset capacity, controlling the energy generation system 120 to charge the first energy storage unit 111, or controlling the energy generation system 120 and the second energy storage unit 112 to charge the first energy storage unit 111.
- the second energy storage unit 112 and/or the energy generation system 120 can simultaneously charge the first energy storage unit 111 in the first stage to meet the demand of the first energy storage unit 111 for charging power, thereby facilitating the extension of the service life of the first energy storage unit 111.
- the difference between the output power of the energy generation system 120 and the required power of the power grid 130 is greater than or equal to the charging power of the first energy storage unit 111 , it is only necessary to control the energy generation system 120 to charge the first energy storage unit 111 .
- the second energy storage unit 112 and the energy generation system 120 are controlled to charge the first energy storage unit 111 simultaneously in the first stage.
- the power delivered by the energy generation system 120 to the first energy storage unit 111 is P2-P4
- the power delivered by the second energy storage unit 112 to the first energy storage unit 111 is P1-(P2-P4).
- controlling the energy generation system 120 to charge the first energy storage unit 111 of the plurality of energy storage units includes: when the remaining capacity of the second energy storage unit 112 is less than the minimum preset capacity, controlling the energy generation system 120 to charge the second energy storage unit 112; after controlling the energy generation system 120 to charge the second energy storage unit 112, controlling the energy generation system 120 and/or the second energy storage unit 112 to charge the first energy storage unit 111.
- the remaining capacity of the second energy storage unit 112 can be made greater than the minimum preset capacity, so that when charging the first energy storage unit 111, the charging power requirement of the first energy storage unit 111 is met.
- the energy generation system 120 can also be controlled to simultaneously charge the first energy storage unit 111 and the second energy storage unit 112. It should be noted that the charging power of the first energy storage unit 111 is the appropriate charging power calculated by the BMS, and the charging power of the second energy storage unit 112 does not exceed the maximum charging power of the second energy storage unit 112.
- controlling the first energy storage unit 111 to discharge to the second energy storage unit 112 of the plurality of energy storage units includes: in the second stage, according to the dispatching state of the power grid 130 and at least one of the remaining capacity of the second energy storage unit 112, controlling the first energy storage unit 111 to discharge to the second energy storage unit 112 of the plurality of energy storage units. In this way, it is convenient to flexibly set different discharge strategies of the first energy storage unit 111 in the charging cycle according to actual conditions.
- controlling the first energy storage unit 111 to discharge to the second energy storage unit 112 of the plurality of energy storage units includes: when the remaining capacity of the second energy storage unit 112 is less than the maximum preset capacity, controlling the first energy storage unit 111 to discharge to the second energy storage unit 112. In this way, overcharging caused by excessive power received by the second energy storage unit 112 can be avoided.
- controlling the first energy storage unit 111 to discharge to the second energy storage unit 112 of the plurality of energy storage units includes: when the dispatching state of the power grid 130 includes the absence of energy dispatching demand, controlling the output power of the energy generation system 120 to be 0, and controlling the first energy storage unit 111 to discharge to the second energy storage unit 112. In this way, the first energy storage unit 111 can be prevented from discharging to the power grid 130 and affecting the stability of the power grid 130.
- controlling the first energy storage unit 111 to discharge to the second energy storage unit 112 of the plurality of energy storage units includes: when the dispatching state of the power grid 130 includes the existence of energy dispatching demand, controlling the output power of the energy generation system 120 to be equal to the required power of the power grid 130, and controlling the first energy storage unit 111 to discharge to the second energy storage unit 112.
- This implementation is simple and easy, and can simultaneously meet the demand of the power grid 130 and the demand of the first energy storage unit 111 to discharge to the second energy storage unit 112.
- the method further includes: when the charge amount of the first energy storage unit 111 reaches the first preset capacity, controlling the first energy storage unit 111 to switch from the first stage to the second stage; when the discharge amount of the first energy storage unit 111 reaches the second preset capacity, controlling the first energy storage unit 111 to switch from the second stage to the first stage. In this way, by continuously switching between the first stage and the second stage during the charging cycle of the first energy storage unit 111, the charging of the first energy storage unit 111 is achieved.
- the first preset capacity and the second preset capacity can be specifically set according to actual needs, and this application does not impose any specific restrictions on this.
- the first preset capacity is greater than the second preset capacity.
- the time of the first stage is less than the time of the second stage.
- the charging power of the first energy storage unit 111 may be different, or may be determined according to battery information of the first energy storage unit 111 .
- the method further includes: when the remaining capacity of the first energy storage unit 111 reaches the maximum preset capacity, controlling the energy generation system 120 to stop charging the first energy storage unit 111.
- the remaining capacity of the first energy storage unit 111 does not exceed the maximum preset capacity, and after the energy generation system 120 finishes charging the first energy storage unit 111, it can serve as an energy absorption device to receive the electricity discharged by other energy storage units of the multiple energy storage units.
- the control device no longer controls the energy generation system 120 to charge the first energy storage unit 111.
- the first energy storage unit 111 only serves as an energy absorption device to absorb the electricity released by the remaining energy storage units during the discharge phase of the charging cycle; at the same time, the first energy storage unit 111 will not charge the remaining energy storage battery units.
- FIG7 is a schematic diagram of a control device according to an embodiment of the present application.
- the present application provides a control device 500, the control device 500 is coupled to an energy storage system 110, the energy storage system 110 is coupled to an energy generation system 120 and a power grid 130, the energy storage system 110 is used to store the electric energy obtained from the energy generation system 120 and release the electric energy to the power grid 130, the energy storage system 110 includes a plurality of energy storage units, and the control device 500 includes a control unit 510.
- the control unit 510 is used to: in a first stage, control the energy generation system 120 to charge the first energy storage unit 111 of the plurality of energy storage units, the first stage is the charging stage of the charging cycle of the first energy storage unit 111; in a second stage, control the first energy storage unit 111 to discharge the second energy storage unit 112 of the plurality of energy storage units, the second stage is the discharging stage of the charging cycle of the first energy storage unit 111.
- control unit 510 is also used to: in the first stage, control the energy generation system 120 to charge the first energy storage unit 111 of the multiple energy storage units according to the dispatching status of the power grid 130, the output power of the energy generation system 120, the charging power of the first energy storage unit 111, the remaining capacity of the first energy storage unit 111 and at least one of the remaining capacity of the second energy storage unit 112.
- control unit 510 is also used to execute any one of the control methods described above. Similar descriptions can be found above and will not be repeated here.
- FIG8 is a schematic diagram of an energy storage system according to an embodiment of the present application.
- the present application provides an energy storage system 110, which is coupled to an energy generation system 120 and a power grid 130, and is used to store electrical energy obtained from the energy generation system 120 and release electrical energy to the power grid 130, and the energy storage system 110 includes a plurality of energy storage units and the control device 500 described above.
- the energy storage system 110 includes a plurality of energy storage units, for example, two energy storage units, namely a first energy storage unit 111 and a second energy storage unit 112, which are connected in parallel.
- the energy storage system 110 may also include three or more energy storage units.
- the control device 500 can be connected to multiple energy storage units in a wireless or wired manner, and the embodiment of the present application does not impose any specific limitation on this.
- Fig. 9 is a schematic diagram of a control device of an embodiment of the present application.
- the present application provides a control device 600 of an energy storage system 110, the control device 600 includes a memory 610 and a processor 620, the memory 610 is used to store instructions, and the processor 620 is used to read the instructions and execute the method described above according to the instructions.
- the processor 620 of the embodiment of the present application can be an integrated circuit chip with signal processing capabilities.
- each step of the above method embodiment can be completed by the hardware integrated logic circuit in the processor or the instruction in the form of software.
- the above processor can be a general processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
- DSP Digital Signal Processor
- ASIC Application Specific Integrated Circuit
- FPGA Field Programmable Gate Array
- the methods and steps disclosed in the embodiments of the present application can be implemented or executed.
- the general processor can be a microprocessor or the processor can also be any conventional processor, etc.
- the steps of the method disclosed in the embodiment of the present application can be directly embodied as being executed by a hardware decoding processor, or being executed by a combination of hardware and software modules in the decoding processor.
- the software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc.
- the storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
- the memory 610 of the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories.
- the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory.
- the volatile memory may be a random access memory (RAM), which is used as an external cache.
- RAM Direct Rambus RAM
- SRAM Static RAM
- DRAM Dynamic RAM
- SDRAM Synchronous DRAM
- DDR SDRAM Double Data Rate SDRAM
- ESDRAM Enhanced SDRAM
- SLDRAM Synchlink DRAM
- DR RAM Direct Rambus RAM
- the present application also provides a computer-readable storage medium for storing a computer program.
- the computer-readable storage medium can be applied to the control device of the energy storage system in the embodiment of the present application, and when the computer program is run on the computer, the computer executes the corresponding processes implemented by the control device in the various methods of the embodiment of the present application. For the sake of brevity, they are not repeated here.
- An embodiment of the present application also provides a computer program product, including computer program instructions.
- the computer program product can be applied to the control device of the energy storage system in the embodiment of the present application, and when the computer program instructions are executed on a computer, the computer executes the corresponding processes implemented by the control device of the energy storage system in each method of the embodiment of the present application. For the sake of brevity, they are not repeated here.
- the embodiment of the present application also provides a computer program.
- the computer program may be applied to the control device of the energy storage system in the embodiment of the present application.
- the computer program runs on a computer, the computer executes the corresponding processes implemented by the control device of the energy storage system in the various methods of the embodiment of the present application. For the sake of brevity, they are not described here.
- the disclosed systems, devices and methods can be implemented in other ways.
- the device embodiments described above are only schematic.
- the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.
- Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.
- the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
- each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
- the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
- the technical solution of the present application or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application.
- the aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.
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Abstract
Description
Claims (23)
- 一种储能系统的控制方法,其特征在于,所述储能系统包括多个储能单元,所述储能系统与能源产生系统和电网耦合,所述储能系统用于存储从所述能源产生系统获得的电能并向所述电网释放电能,所述方法包括:在第一阶段,控制所述能源产生系统向所述多个储能单元的第一储能单元充电,所述第一阶段为所述第一储能单元的充电周期的充电阶段;在第二阶段,控制所述第一储能单元向所述多个储能单元的第二储能单元放电,所述第二阶段为所述第一储能单元的充电周期的放电阶段。
- 根据权利要求1所述的控制方法,其特征在于,所述在第一阶段,控制所述能源产生系统向所述多个储能单元的第一储能单元充电,包括:在所述第一阶段,根据所述电网的调度状态、所述能源产生系统的输出功率、所述第一储能单元的充电功率、所述第一储能单元的剩余容量、和所述第二储能单元的剩余容量中的至少一个,控制所述能源产生系统向所述多个储能单元的第一储能单元充电。
- 根据权利要求2所述的控制方法,其特征在于,所述根据电网的调度状态、所述能源产生系统的输出功率、所述第一储能单元的充电功率、所述第一储能单元的剩余容量、和所述第二储能单元的剩余容量中的至少一个,控制所述能源产生系统向所述多个储能单元的第一储能单元充电,包括:在所述第一储能单元的剩余容量小于最大预设容量的情况下,控制所述能源产生系统向所述第一储能单元充电。
- 根据权利要求2或3所述的控制方法,其特征在于,所述根据电网的调度状态、所述能源产生系统的输出功率、所述第一储能单元的充电功率、所述第一储能单元的剩余容量、和所述第二储能单元的剩余容量中的至少一个,控制所述能源产生系统向所述多个储能单元的第一储能单元充电,包括:在所述电网的调度状态包括不存在能源调度需求的情况下,根据所述能源产生系统的输出功率、所述第一储能单元的充电功率和所述第二储能单元的剩余容量,控制所述能源产生系统向所述第一储能单元充电。
- 根据权利要求4所述的控制方法,其特征在于,所述控制所述能源产生系统向 所述多个储能单元的第一储能单元充电,包括:在所述能源产生系统的输出功率小于所述第一储能单元的充电功率的情况下,控制所述能源产生系统向所述第一储能单元充电,并且控制所述第二储能单元和所述电网中的至少一个向所述第一储能单元充电,其中,所述第二储能单元的剩余容量大于或等于最小预设容量。
- 根据权利要求4所述的控制方法,其特征在于,所述控制所述能源产生系统向所述多个储能单元的第一储能单元充电,包括:在所述能源产生系统的输出功率大于或等于所述第一储能单元的充电功率的情况下,控制所述能源产生系统的输出功率与所述第一储能单元的充电功率相同;在控制所述能源产生系统的输出功率与所述第一储能单元的充电功率相同之后,控制所述能源产生系统向所述第一储能单元充电。
- 根据权利要求4所述的控制方法,其特征在于,所述控制所述能源产生系统向所述多个储能单元的第一储能单元充电,包括:在所述第二储能单元的剩余容量小于最小预设容量的情况下,控制所述能源产生系统和/或所述电网向所述第二储能单元充电。
- 根据权利要求7所述的控制方法,其特征在于,所述控制所述能源产生系统和/或所述电网向所述第二储能单元充电,包括:在所述能源产生系统的输出功率小于所述第一储能单元的充电功率的情况下,控制所述能源产生系统和所述电网向所述第一储能单元充电,控制所述电网向所述第二储能单元充电。
- 根据权利要求7所述的控制方法,其特征在于,所述控制所述能源产生系统和/或所述电网向所述第二储能单元充电,包括:在所述能源产生系统的输出功率等于所述第一储能单元的充电功率的情况下,控制所述能源产生系统向所述第一储能单元充电,控制所述电网向所述第二储能单元充电;在所述能源产生系统的输出功率大于所述第一储能单元的充电功率的情况下,控制所述能源产生系统向所述第一储能单元充电,控制所述能源产生系统和/或所述电网向所述第二储能单元充电。
- 根据权利要求9所述的控制方法,其特征在于,在所述能源产生系统的输出功 率大于所述第一储能单元的充电功率的情况下,控制所述能源产生系统向所述第一储能单元充电,控制所述能源产生系统和/或所述电网向所述第二储能单元充电,包括:在所述能源产生系统的输出功率与所述第一储能单元的充电功率之差小于所述第二储能单元的最大充电功率的状态下,控制所述能源产生系统和所述电网向所述第二储能单元充电。
- 根据权利要求2或3所述的控制方法,其特征在于,所述根据电网的调度状态、所述能源产生系统的输出功率、所述第一储能单元的充电功率、所述第一储能单元的剩余容量和所述第二储能单元的剩余容量中的至少一个,控制所述能源产生系统向所述多个储能单元的第一储能单元充电,包括:在所述电网的调度状态包括存在能源调度需求且所述能源产生系统的输出功率大于所述电网的需求功率的情况下,根据所述能源产生系统的输出功率、所述第一储能单元的充电功率和所述第二储能单元的剩余容量,控制所述能源产生系统向所述第一储能单元充电。
- 根据权利要求11所述的控制方法,其特征在于,所述控制所述能源产生系统向所述多个储能单元的第一储能单元充电,包括:在所述第二储能单元的剩余容量大于或等于最小预设容量的情况下,控制所述能源产生系统向所述第一储能单元充电,或控制所述能源产生系统和所述第二储能单元向所述第一储能单元充电。
- 根据权利要求11所述的控制方法,其特征在于,所述控制所述能源产生系统向所述多个储能单元的第一储能单元充电,包括:在所述第二储能单元的剩余容量小于最小预设容量的情况下,控制所述能源产生系统向所述第二储能单元充电;在控制所述能源产生系统向所述第二储能单元充电之后,控制所述能源产生系统和/或所述第二储能单元向所述第一储能单元充电。
- 根据权利要求1-13中任一项所述的控制方法,其特征在于,所述在第二阶段,控制所述第一储能单元向所述多个储能单元的第二储能单元放电,包括:在所述第二阶段,根据电网的调度状态和所述第二储能单元的剩余容量中的至少一个,控制所述第一储能单元向所述多个储能单元的第二储能单元放电。
- 根据权利要求14所述的控制方法,其特征在于,所述根据电网的调度状态和 所述第二储能单元的剩余容量中的至少一个,控制所述第一储能单元向所述多个储能单元的第二储能单元放电,包括:在所述第二储能单元的剩余容量小于最大预设容量的情况下,控制所述第一储能单元向所述第二储能单元放电。
- 根据权利要求14或15所述的控制方法,其特征在于,所述根据电网的调度状态和所述第二储能单元的剩余容量中的至少一个,控制所述第一储能单元向所述多个储能单元的第二储能单元放电,包括:在所述电网的调度状态包括存在能源调度需求的情况下,控制所述能源产生系统的输出功率为0,并控制所述第一储能单元向所述第二储能单元放电。
- 根据权利要求14或15所述的控制方法,其特征在于,所述根据电网的调度状态和所述第二储能单元的剩余容量中的至少一个,控制所述第一储能单元向所述多个储能单元的第二储能单元放电,包括:在所述电网的调度状态包括存在能源调度需求的情况下,控制所述能源产生系统的输出功率等于所述电网的需求功率,并控制所述第一储能单元向所述第二储能单元放电。
- 根据权利要求1-17中任一项所述的控制方法,其特征在于,所述方法还包括:在所述第一储能单元的充电量达到第一预设容量的情况下,控制所述第一储能单元从所述第一阶段切换到所述第二阶段;在所述第一储能单元的放电量达到第二预设容量的情况下,控制所述第一储能单元从所述第二阶段切换到所述第一阶段。
- 根据权利要求1-18中任一项所述的控制方法,其特征在于,所述方法还包括:在所述第一储能单元的剩余容量达到最大预设容量的情况下,控制所述能源产生系统停止向所述第一储能单元充电。
- 一种控制装置,所述控制装置耦合到储能系统,其特征在于,所述储能系统与能源产生系统和电网耦合,所述储能系统用于存储从所述能源产生系统获得的电能并向所述电网释放电能,所述储能系统包括多个储能单元,所述控制装置包括控制单元,所述控制单元用于:在第一阶段,控制所述能源产生系统向所述多个储能单元的第一储能单元充电,所述第一阶段为所述第一储能单元的充电周期的充电阶段;在第二阶段,控制所述第一储能单元向所述多个储能单元的第二储能单元放电,所述第二阶段为所述第一储能单元的充电周期的放电阶段。
- 根据权利要求20所述的控制装置,其特征在于,所述控制单元还用于:在所述第一阶段,根据所述电网的调度状态、所述能源产生系统的输出功率、所述第一储能单元的充电功率、所述第一储能单元的剩余容量、和所述第二储能单元的剩余容量中的至少一个,控制所述能源产生系统向所述多个储能单元的第一储能单元充电。
- 一种储能系统,其特征在于,所述储能系统与能源产生系统和电网耦合,所述储能系统用于存储从所述能源产生系统获得的电能并向所述电网释放电能,所述储能系统包括多个储能单元和如权利要求20或21所述的控制装置。
- 一种储能系统的控制装置,其特征在于,所述控制装置包括存储器和处理器,所述存储器用于存储指令,所述处理器用于读取所述指令并根据所述指令执行如权利要求1至19中任一项所述的方法。
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