WO2022194196A1 - 分布式补偿器的协调控制方法、系统、计算机设备和存储介质 - Google Patents

分布式补偿器的协调控制方法、系统、计算机设备和存储介质 Download PDF

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Publication number
WO2022194196A1
WO2022194196A1 PCT/CN2022/081153 CN2022081153W WO2022194196A1 WO 2022194196 A1 WO2022194196 A1 WO 2022194196A1 CN 2022081153 W CN2022081153 W CN 2022081153W WO 2022194196 A1 WO2022194196 A1 WO 2022194196A1
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WIPO (PCT)
Prior art keywords
modules
module
phase
standby state
hot standby
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Ceased
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PCT/CN2022/081153
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English (en)
French (fr)
Inventor
林艺哲
董云龙
卢宇
潘磊
马秀达
任铁强
吴飞翔
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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Application filed by NR Electric Co Ltd, NR Engineering Co Ltd filed Critical NR Electric Co Ltd
Priority to MX2023008059A priority Critical patent/MX2023008059A/es
Priority to EP22770549.8A priority patent/EP4254708B1/en
Priority to BR112023012644-4A priority patent/BR112023012644B1/pt
Priority to PE2023001970A priority patent/PE20231482A1/es
Publication of WO2022194196A1 publication Critical patent/WO2022194196A1/zh
Priority to CONC2023/0008321A priority patent/CO2023008321A2/es
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control having reactive elements actively controlled by bridge converters, e.g. active filters or static compensators [STATCOM]
    • 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
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control having reactive elements actively controlled by bridge converters, e.g. active filters or static compensators [STATCOM]
    • H02J3/1857—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control having reactive elements actively controlled by bridge converters, e.g. active filters or static compensators [STATCOM] the bridge converters being multilevel bridge converters or modular multilevel converters

Definitions

  • the present application relates to the field of flexible AC power transmission in power systems, and in particular to a coordinated control method, system, computer equipment and storage medium of a distributed compensator.
  • the distributed compensator can directly distribute and hang each small-capacity compensator on the power line to realize the control function and effect of the power flow of the power grid similar to the static synchronous series compensator, and provide a more flexible and advanced control method for the smart grid. , effectively improve the power supply capacity and safety and stability of the power system.
  • the distributed compensator has the characteristics of small size and light weight. A large number of distributed sub-units can ensure the redundancy of the equipment, thereby improving the reliability of the device. At the same time, the distributed compensator devices can be dispersedly deployed on transmission lines or substations, occupying a small area.
  • the common distributed compensator structure includes three-phase voltage source converters connected in series to three-phase AC lines, each phase converter is composed of multi-stage modules in series, and the three phases are kept in balance.
  • the distributed compensator has a single-circuit operation mode and a multi-circuit operation mode.
  • Exemplary embodiments of the present application provide a coordinated control method, system, computer device and storage medium for a distributed compensator, which can quickly and smoothly handle the failure of each phase module of the distributed compensator, and ensure that the After a module failure occurs in a phase, each phase of each loop can still be controlled in a balanced manner to avoid unbalanced disturbance to the AC power grid.
  • a coordinated control method for a distributed compensator is proposed, wherein the distributed compensator is composed of inverters connected in series to three-phase AC lines, and the inverters connected to each phase are connected to the inverters. They are respectively composed of multi-level modules connected in series in sequence, and the method includes:
  • real-time detection of the operating state of each stage of the multi-stage modules of the inverter of each phase is performed to obtain the first mode of each phase.
  • the number of groups, wherein the number of the first modules is the number of available modules with normal operating conditions and no faults in the inverters of the respective phases;
  • any one-stage module of the inverter of any phase fails, block and bypass the failed module, at the same time reduce the number of the first modules of the faulty phase by one, and keep the The number of first modules of the non-faulty phase remains unchanged;
  • the number of the first modules in each phase is compared with the number of the second modules, if the number of the first modules is greater than the number of the second modules, then the The modules in the inverters of the phases where the first modules larger than the number of the second modules are located, and need to be converted into the hot standby state are converted into the hot standby state, wherein the modules that need to be converted into the hot standby state are converted into the hot standby state.
  • the number of the first modules in the phase where the modules that need to be switched to the hot standby state of the group are located minus the number of the second modules.
  • the converter is a voltage source converter.
  • the distributed compensator operates in a single-circuit mode, and only a single-circuit AC line is connected to the distributed compensator in series.
  • the step of calculating in real time the number of the second modules that can effectively output the voltage of the distributed compensator includes:
  • the number of the second modules is equal to the minimum value of the number of the first modules of the respective phases in the single-circuit AC line as the number of the second modules.
  • the distributed compensator operates in a multi-circuit mode, and multiple parallel AC lines are connected to the distributed compensator in series.
  • the step of calculating in real time the number of the second modules that can effectively output the voltage of the distributed compensator includes:
  • the number of received second modules is equal to the minimum value of the number of first modules of each phase in each of the parallel multi-circuit AC lines, and the minimum value is determined from the received minimum values value as the number of the second module.
  • the method further includes: when the number of modules that need to be turned into a hot standby state is greater than or equal to 1, sequentially judging whether the modules at all levels of the phases are faulty, If the current module is not faulty, the current module is converted to the hot standby state, and the number of modules that need to be converted to the hot standby state is reduced by 1.
  • the step of sequentially judging whether the modules at all levels of the phases are faulty includes: When the current module is faulty, the number of modules that need to be transferred to the hot standby state is reduced by 1, and the current module is not transferred to the hot standby state.
  • the method further includes: when the number of modules that need to be turned into a hot standby state is equal to zero, keeping the modules at all levels of the phase where the modules that need to be turned into a hot standby state are running. The state remains unchanged, and the step of calculating in real time the number of modules of the phase that need to be turned into a hot standby state is maintained.
  • the hot standby state is,
  • the module that needs to be turned into a hot standby state is unlocked and operated and has a voltage output capability, but the output voltage of the port of the module that needs to be turned into a hot backup state is kept as 0.
  • the converter is a voltage source converter.
  • a coordinated control system for distributed compensators wherein the distributed compensators include inverters connected in series to three-phase AC lines, and the inverters of each phase are composed of multiple inverters.
  • the stage modules are formed in series in sequence, wherein the coordinated control system includes:
  • a module state monitoring module configured to detect in real time the operating states of modules at all levels in the inverters of the respective phases in the distributed compensator
  • the effective module number calculation module is configured to calculate in real time the number of the first modules of each phase according to the operating state of the modules at each level, and the first number of the effective output voltage of the distributed compensator.
  • the number of two modules, wherein the first number of modules is the number of available modules with normal operating conditions and no faults of the inverter of each phase;
  • the module hot standby state control module is configured to calculate in real time the number of modules that need to be converted to the hot standby state in the inverters of the respective phases, and calculate all the modules in the inverters of the respective phases.
  • the modules that need to be transferred to the hot-standby state are transferred to the hot-standby state.
  • the coordinated control system further includes:
  • the communication module between multi-circuit lines is configured to take effect only when the distributed compensator is in the multi-circuit line operation mode, and determines the minimum value of the number of first modules in each parallel multi-circuit AC line.
  • the module hot-standby state control module is configured to calculate in real time the number of modules that need to be converted into the hot-standby state in the inverters of the respective phases. When the number of modules in the phase that needs to be transferred to the hot standby state is zero, no modules in the one phase are transferred to the hot standby state.
  • the operating states include module unlocked, module locked, and module failure.
  • a computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein the processor implements the steps of the above-mentioned method when the processor executes the computer program.
  • a computer-readable storage medium on which a computer program is stored, wherein when the computer program is executed by a processor, the steps of the above-described method are implemented.
  • the coordinated control of the distributed compensator can be realized: when a certain phase of a certain loop distributed compensator has a module failure , quickly bypass the faulty module of the faulty phase, update the number of modules available for each phase of each loop, and calculate the number of modules that are effectively put into use in each loop in real time. , select the corresponding number of modules to switch to the hot standby state, so as to ensure that the number of modules that can effectively output voltage for each phase of each return line is consistent, thereby ensuring that the output of each phase is consistent, and achieving coordinated and balanced control of each phase of each return line.
  • the module failure of the distributed compensator can be quickly and smoothly handled, ensuring that each phase of each loop can still be controlled in a balanced manner after a module failure occurs in a phase, and avoiding unbalanced disturbance to the AC power grid.
  • Fig. 1 is a flow chart of the processing method after a module failure occurs in a certain phase of the existing power flow controller and the flexible DC transmission project.
  • FIG. 2 is a flowchart of a coordinated control method of a distributed compensator according to an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a coordinated control system of a distributed compensator according to an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a coordinated control system of a distributed compensator according to another embodiment of the present application.
  • FIG. 5 is a flowchart of a control method of a module hot standby state control module according to an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a module hot standby state control module provided by an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a module hot standby state control module provided by another embodiment of the present application.
  • FIG. 8 is an internal structure diagram of a computer device in an embodiment of the present application.
  • the power flow controller or flexible DC transmission project using modular multi-level converters for the case of a module failure in a certain phase, most of the processing methods adopted do not have coordinated control between phases, but instead put redundant inputs into the faulty phase.
  • the redundant modules replace the bypassed faulty modules.
  • the inverter will be blocked.
  • the distributed compensator has no specific redundant design, each series module can operate independently, the inverter has the ability to operate with a single module, so the inverter needs to be triggered only when all the series modules of a phase fail. atresia.
  • a A coordinated control method that can quickly and smoothly handle the faults of each phase module of the distributed compensator, ensuring that after the module fault occurs, each phase of each loop can still be controlled in a balanced manner.
  • Example embodiments will now be described more fully with reference to the accompanying drawings.
  • Example embodiments can be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
  • the same reference numerals in the drawings denote the same or similar parts, and thus their repeated descriptions will be omitted.
  • Fig. 1 is a flow chart of the processing method after a module failure occurs in a certain phase of the existing power flow controller and the flexible DC transmission project.
  • N_RE_N redundant modules are set in the N series modules of each phase inverter of the distributed compensator, and the number of operating modules is set as N_OP_N.
  • the redundant module does not output an effective voltage.
  • the number of remaining redundant modules N_RE is reduced by 1, so as to keep the number of running modules of this phase at N_OP_N unchanged to maintain the original operating state of the converter.
  • the number of remaining redundant modules N_RE is 0, the redundant modules of the phase inverter are exhausted, and the inverter is locked.
  • each series module of the distributed compensator can operate independently, and the converter has the ability to operate with a single module, the redundancy and flexibility of the distributed compensator cannot be fully utilized when the above method is adopted.
  • Exemplary embodiments of the present application provide a coordinated control method, system, computer equipment and storage medium for a distributed compensator, so as to ensure that after a module failure occurs in a certain phase of a certain circuit, each circuit and each phase can still be Balanced control ensures that the distributed compensator can still operate normally, and at the same time avoids unbalanced disturbance to the AC power grid.
  • the purpose of this application is to provide a coordinated control method, system, computer equipment and storage medium for a distributed compensator, so that the failure of each phase module of the distributed compensator can be quickly and smoothly handled, and a certain phase of a certain loop can be guaranteed. After a module failure occurs, each loop and each phase can still be controlled in a balanced manner to avoid unbalanced disturbance to the AC power grid.
  • FIG. 2 shows a flowchart of a coordinated control method for a distributed compensator according to an embodiment of the present application.
  • step S210 configure the distributed compensator.
  • the distributed compensator is composed of inverters connected in series to the three-phase AC line, and the inverters of each phase are respectively composed of multi-stage modules connected in series in sequence.
  • Step S220 detecting the operating state of each stage module of each phase inverter.
  • real-time detection of the operating state of each stage of the multi-stage modules of the inverter of each phase is performed to obtain the first mode of each phase.
  • the number of groups, wherein the number of the first modules is the number of available modules with normal operating conditions and no faults in the inverters of the respective phases.
  • Step S230 calculating the number of modules that the distributed compensator can output voltage effectively.
  • the number of the second modules that can effectively output the voltage of the distributed compensator is calculated in real time, wherein the number of the second modules is equal to the minimum value of the number of the first modules in each phase.
  • step S240 the bypass is blocked when the module fails.
  • step S250 the module to be converted is turned into a hot standby state.
  • the number of the first module in each phase is compared with the number of the second module, if the number of the first module is greater than the number of the second module, then the number of the first module is The modules that need to be switched to the hot standby state in the inverter of the phase where the first module is located are switched to the hot standby state,
  • the number of modules that need to be turned into a hot standby state is equal to the number of the first modules in the phase where the modules that need to be turned into a hot standby state are located minus the number of the second modules.
  • the converter is a three-phase voltage source type converter.
  • the step of calculating in real time the number of the second modules that can effectively output the voltage of the distributed compensator includes: determining that the number of the second modules is equal to the single-circuit AC line. The minimum value of the number of the first modules of the respective phases is taken as the number of the second modules.
  • the step of calculating in real time the number of the second modules that can effectively output the voltage of the distributed compensator includes: receiving the number of the second modules equal to each of the parallel The minimum value of the number of the first modules of each phase in the multi-circuit AC line, and the minimum value is determined from the received minimum values as the number of the second modules.
  • FIG. 3 shows a schematic structural diagram of a coordinated control system of a distributed compensator according to an embodiment of the present application.
  • the distributed compensator in each loop, includes inverters connected in series to the three-phase AC line, and each phase inverter is composed of multi-stage modules in series in sequence.
  • the coordinated control system includes M loops, each loop is connected to inverters of three-phase AC lines in series, and the inverters of each phase are respectively composed of N-level unit modules in series in sequence.
  • the inverters of each phase include the first-stage unit modules, the second-stage unit modules, and the Nth-stage unit modules.
  • FIG. 4 shows a schematic structural diagram of a coordinated control system of a distributed compensator according to an embodiment of the present application.
  • the coordinated control system of the distributed compensator includes a module state monitoring module 10 , an effective module number calculation module 20 , a module hot standby state control module 30 and a multi-circuit communication module 40 .
  • the module state monitoring module 10 is configured to detect in real time the operating states of the modules at each stage in the inverters of each phase in the distributed compensator, and transmit the operating states of the modules at each stage to The effective module number calculation module 20 .
  • the multi-circuit inter-line communication module 40 takes effect only when the distributed compensator is in the multi-circuit operation mode, and summarizes the number of available modules of each phase of the inverter in each of the parallel multi-circuit AC lines. The minimum value of the number of available modules is passed to the effective module number calculation module 20. It can be understood that, for the single-circuit operation mode, the communication module 40 between multiple circuits can be omitted.
  • the effective module number calculation module 20 is configured to calculate in real time the number of available modules of the inverters described in each phase according to the operating states of the modules at all levels, and to calculate in real time the available modules of the distributed compensator.
  • the second number of modules of output voltage wherein the first number of modules is the number of available modules with normal operating conditions and no faults of the inverter of each phase, and will be able to effectively output voltage
  • the number of modules is passed to the module hot standby state control module 30 .
  • the module hot standby state control module 30 is configured to calculate in real time the number of modules that need to be converted into the hot standby state in the inverters of each phase, and to calculate the number of modules in the inverters of each phase.
  • the modules that need to be converted to the hot standby state are converted to the hot standby state, wherein the number of modules that need to be converted to the hot standby state in the inverters of each phase is equal to the available modules of the inverters of each phase.
  • the number of modules that can effectively output the voltage of the distributed compensator is subtracted from the number.
  • the operating status of each level of modules includes module unlocking, module locking and module failure.
  • Each module in the above-mentioned distributed compensator coordinated control system can be implemented in whole or in part by software, hardware and combinations thereof.
  • the above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.
  • FIG. 5 shows a flowchart of a control method of a module hot standby state control module according to an embodiment of the present application.
  • step S510 receiving module status data.
  • the module hot standby state control module is configured to receive the transmitted signal of the number of available modules of each phase inverter and the signal of the number of modules that the distributed compensator can effectively output voltage.
  • Step S520 calculating the number of modules that need to be transferred to the hot standby state.
  • the module hot standby state control module is configured to calculate in real time the number of modules that need to be converted into the hot standby state in the inverters of each phase, wherein the modules in the inverters of each phase that need to be converted into the hot standby state
  • the number is equal to the number of available modules of the inverter in each phase minus the number of modules that the distributed compensator can effectively output voltage.
  • step S530 it is detected whether a module needs to be switched to a hot standby state.
  • the module hot standby state control module is configured to first determine whether the current module is faulty.
  • step S540 the modules are sequentially detected until no modules need to be switched to the hot standby state.
  • each module is judged in turn, until the number of modules that need to be converted to the hot standby status is zero. For example, if the detected module is faulty, continue to judge the next module, and the number of modules in the hot standby state is reduced by 1. As shown in Figure 6, if the number of available modules of the inverter in this phase is greater than the number of modules effectively put into use by the distributed compensator, first determine whether the first-level module is faulty, and if there is no fault, it will be turned into a hot standby state , if there is a fault, continue to judge the second-level module, and so on, until the number of hot-standby modules equals the number of available modules of the current inverter minus the number of effective input modules of the distributed compensator.
  • the number of available modules of the inverter of this phase is greater than the number of modules effectively put into the distributed compensator, then first determine whether the Nth-level module is faulty, and if there is no fault, turn the It is in the hot standby state. If there is a fault, continue to judge the N-1 level modules, and so on, until the number of hot standby modules is equal to the number of available modules of the inverter in this phase minus the effective input modules of the distributed compensator. number.
  • Each exemplary embodiment of the present application further provides a computer device, including a memory and a processor, where a computer program is stored in the memory, and the processor implements the coordination of the distributed compensator provided by the various embodiments of the present application when the processor executes the computer program
  • the steps of the control method are not limited to the above-mentioned exemplary embodiments, but for example, additional and optional other operations/steps may also be implemented, and some operations/steps may also be It can be decomposed, and some operations/steps can be combined or partially combined, so the actual execution order may change according to the actual situation.
  • a computer device is provided, and the computer device may be a terminal, and its internal structure diagram may be as shown in FIG. 8 .
  • the computer equipment includes a processor, memory, a network interface, a display screen, and an input device connected by a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities.
  • the memory of the computer device includes a non-volatile storage medium, an internal memory.
  • the nonvolatile storage medium stores an operating system and a computer program.
  • the internal memory provides an environment for the execution of the operating system and computer programs in the non-volatile storage medium.
  • the computer device may include a network interface for communicating with external terminals through a network connection.
  • the computer equipment may also include a display screen, which may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment may be a touch layer covered on the display screen, or buttons, Trackball or trackpad, or an external keyboard, trackpad, or mouse, etc.
  • FIG. 8 is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer equipment to which the solution of the present application is applied. Include more or fewer components than shown in the figures, or combine certain components, or have a different arrangement of components.
  • the exemplary embodiments of the present application also provide a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, realizes the coordinated control method of the distributed compensator provided by the various embodiments of the present application. step.
  • steps of the implemented control method are not limited to the above-mentioned exemplary embodiments, but for example, additional and optional other operations/steps may also be implemented, and some operations/steps may also be It can be decomposed, and some operations/steps can be combined or partially combined, so the actual execution order may change according to the actual situation.
  • the present application can realize the coordinated control of the distributed compensator: when a module failure occurs in a certain phase of the distributed compensator of a certain loop, the faulty module of the faulty phase is quickly bypassed, At the same time, update the number of modules available for each phase of each circuit, and calculate the number of modules available for each circuit in real time. According to the number of modules available for each phase and the number of modules available for each circuit, select the corresponding number of modules to switch to the hot standby state. , so as to ensure that the number of modules that can effectively output voltage for each phase of each return line is consistent, thereby ensuring that the output of each phase is consistent, and achieving coordinated and balanced control of each phase of each return line.
  • the coordinated control method of the distributed compensator of the present application can quickly and smoothly handle the module failure of the distributed compensator, ensuring that each phase of each loop can still be used after a module failure occurs in a certain phase. Balance control to avoid unbalanced disturbance to the AC grid.
  • Nonvolatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory.
  • Volatile memory may include random access memory (RAM), which acts as external cache memory.
  • RAM is available in various forms such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous Link (Synchlink) DRAM (SLDRAM), Memory Bus (Rambus) Direct RAM (RDRAM), Direct Memory Bus Dynamic RAM (DRDRAM), and Memory Bus Dynamic RAM (RDRAM).
  • SRAM static RAM
  • DRAM dynamic RAM
  • SDRAM synchronous DRAM
  • DDR SDRAM double data rate SDRAM
  • ESDRAM enhanced SDRAM
  • SLDRAM synchronous Link (Synchlink) DRAM
  • SLDRAM synchronous Link (Synchlink) DRAM
  • Memory Bus Radbus
  • RDRAM Direct RAM
  • DRAM Direct Memory Bus Dynamic RAM
  • RDRAM Memory Bus Dynamic RAM

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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Hardware Redundancy (AREA)
  • Safety Devices In Control Systems (AREA)
  • Control Of Electrical Variables (AREA)
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Abstract

本申请提供一种分布式补偿器的协调控制方法、系统、计算机设备和存储介质。所述方法包括：装配分布式补偿器；检测各相换流器每级模组的运行状态；计算分布式补偿器可有效输出电压的模组个数；模组故障时闭锁旁路；将需要转换的模组转为热备用状态。

Description

分布式补偿器的协调控制方法、系统、计算机设备和存储介质
相关申请
本申请要求于2021年3月18日提交中国专利局、申请号为202110288300.4、申请名称为“一种分布式补偿器的协调控制方法及系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电力系统柔性交流输电领域，具体涉及一种分布式补偿器的协调控制方法、系统、计算机设备和存储介质。
背景技术
随着大型电力系统的互联以及各种新设备的使用，在使发电、输电更经济、更高效的同时也增加了电力系统的规模和复杂度。再加上大量的分布式发电系统接入电网，使传统的固定由输电网向配电网传送的潮流发生逆向。用户负荷的不断增长，需要潮流控制手段以提高现有的功率输送能力。正在蓬勃发展的智能电网和电力市场间复杂的功率交换也需要频繁的潮流优化控制。
分布式补偿器可以将每个小容量补偿器直接分布式悬挂于电力线路上，实现对静止同步串联补偿器相近的电网潮流的控制功能和效果，可为智能电网提供更灵活、更先进的控制手段，有效提高电力系统的供电能力和安全稳定性。分布式补偿器具有体积小、重量轻等特点。大量分布式子单元可保障设备的冗余性，进而提升装置的可靠性。同时，分布式补偿器装置可分散部署在输电线路上或者变电站，占地小。
目前中国国外已有两个分布式补偿器的示范工程(分布式静止同步串联补偿器)项目，两个项目的控制保护系统比较简单，均采用模块就地控制的模式，控制方式不灵活，潮流调节的性能较差。中国国内有部分高校和科研院所开展了多种分布式补偿器(分布式串联电抗器、分布 式静止同步串联补偿器、分布式潮流控制器等)的项目，主要在拓扑结构、仿真建模和系统控制策略上开展研究，尚无关于分布式补偿器出现模组故障时，各回线各相间协调控制的文献和专利。
常见的分布式补偿器结构包括分别串联接入三相交流线路的三相电压源型换流器，各相换流器由多级模组依次串联构成，三相保持平衡。所述分布式补偿器存在单回线运行方式和多回线运行方式。在所述背景技术部分，公开的上述信息仅用于加强对本申请的背景的理解，因此它可以包括不构成对本领域普通技术人员已知的现有技术信息。
发明内容
本申请各示例性实施例提供一种分布式补偿器的协调控制方法、系统、计算机设备和存储介质，其能够快速、平稳地处理分布式补偿器的各相模组故障，保证某一回线的某一相出现模组故障后，各回线各相仍可均衡控制，避免对交流电网造成不平衡扰动。
根据本申请的一方面，提出分布式补偿器的协调控制方法，其中，所述分布式补偿器由分别串联接入三相交流线路的换流器构成，接入各相的所述换流器分别由多级模组依次串联构成，所述方法包括：
在所述分布式补偿器正常运行的过程中，实时检测各相的所述换流器的所述多级模组中的各级模组的运行状态，以获得所述各相的第一模组个数，其中，所述第一模组个数分别为所述各相的所述换流器中具备正常运行条件且无故障的可用模组个数；
实时计算所述分布式补偿器的可有效输出电压的第二模组个数，其中，所述第二模组个数等于所述各相中的所述第一模组个数中的最小值；
当任一相所述换流器的任一级模组故障时，闭锁并旁路所述发生故障的所述模组，同时将所述故障相的第一模组个数减一，并保持非故障相的第一模组个数不变；以及
将所述各相中的所述第一模组个数分别与所述第二模组个数进行对比，若所述第一模组个数大于所述第二模组个数，则将所述大于所述第二模组个数的第一模组所在相的换流器中的需要转为热备用状态的模组转为热备用状态，其中，所述需要转为热备用状态的模组的所述需要转 为热备用状态的模组所在相的第一模组个数减去所述第二模组个数。
在一实施例中，所述换流器是电压源型换流器。
在一实施例中，所述分布式补偿器是单回线运行方式，仅单回交流线路串联接入所述分布式补偿器。
在一实施例中，所述实时计算所述分布式补偿器的可有效输出电压的所述第二模组个数的步骤包括：
确定所述第二模组个数等于所述单回交流线路中的所述各相的所述第一模组个数的最小值作为所述第二模组个数。
在一实施例中，所述分布式补偿器是多回线运行方式，并联的多回交流线路均串联接入所述分布式补偿器。
在一实施例中，所述实时计算所述分布式补偿器的可有效输出电压的所述第二模组个数的步骤包括：
接收所述第二模组个数等于每条所述并联的多回交流线路中的所述各相的所述第一模组个数的最小值，从所述接收的最小值中再确定最小值作为所述第二模组个数。
在一实施例中，所述方法还包括：当所述需要转为热备用状态的模组的个数大于或等于1时，依次判断所述各相的所述各级模组是否有故障，若当前模组无故障，则将所述当前模组转为所述热备用状态，并且所述需要转为热备用状态的模组的个数减少1。
在一实施例中，所述当所述需要转为热备用状态的模组的个数大于或等于1时，依次判断所述各相的所述各级模组是否有故障的步骤，包括：当所述当前模组有故障，所述需要转为热备用状态的模组的个数减少1，所述当前模组不转为所述热备用状态。
在一实施例中，所述方法还包括：当所述需要转为热备用状态的模组的个数等于零时，保持所述需要转为热备用状态的模组所在相的各级模组运行状态不变，并保持实时计算该相的所述需要转为热备用状态的模组的个数的步骤。
在一实施例中，所述热备用状态为，
将所述需要转为热备用状态的模组解锁运行且具备电压输出能力，但保持所述需要转为热备用状态的模组的端口的输出电压为0的状态。
在一实施例中，所述换流器是电压源型换流器。
根据本申请的另一方面，提供一种分布式补偿器的协调控制系统，所述分布式补偿器包括分别串联接入三相交流线路的换流器，各相的所述换流器由多级模组依次串联构成，其中，所述协调控制系统包括：
模组状态监视模块，配置为实时检测所述分布式补偿器中所述各相的所述换流器中的各级的模组的运行状态；
有效模组数计算模块，配置为根据每级所述各级的模组的运行状态，实时计算所述各相的第一模组个数，所述分布式补偿器的可有效输出电压的第二模组个数，其中所述第一模组个数为所述各相的所述换流器的具备正常运行条件且无故障的可用模组数；以及
模组热备用状态控制模块，配置为实时计算所述各相的所述换流器中需要转为热备用状态的模组的个数，将所述各相的所述换流器中的所述需要转为热备用状态的模组转为热备用状态。
在一实施例中，所述协调控制系统还包括：
多回线间通讯模块，配置为仅在所述分布式补偿器为多回线运行方式时生效，并确定各条并联的多回交流线路中的第一模组个数的最小值。
在一实施例中，所述模组热备用状态控制模块配置为实时计算所述各相的所述换流器中需要转为热备用状态的模组个数，当所述各相中的一相中的所述需要转为热备用状态的模组个数为零时，则所述一相中没有模组转为热备用状态。
在一实施例中，所述运行状态包括模组解锁、模组闭锁和模组故障。
根据本申请的另一方面，提供一种计算机设备，包括存储器和处理器，所述存储器存储有计算机程序，其中，所述处理器执行所述计算机程序时实现上述所述方法的步骤。
根据本申请的另一方面，提供一种计算机可读存储介质，其上存储有计算机程序，其中，所述计算机程序被处理器执行时实现上述所述的方法的步骤。
根据本申请提供的分布式补偿器的协调控制方法、系统、计算机设备和存储介质，可以实现分布式补偿器的协调控制：当某一回线分布式补偿器的某一相出现模组故障后，迅速将故障相的故障模组旁路，同时 更新各回线各相可用模组数，并实时计算各回线有效投入模组数，并根据各相可用模组数和各回线有效投入模组数，选择对应数量的模组转为热备用状态，从而保证各回线各相可有效输出电压的模组个数保持一致，进而保证各相输出一致，实现各回线各相协调均衡控制。采用上述协调控制方案，可以快速、平稳地处理分布式补偿器的模组故障，保证各回线各相在某一相出现模组故障后仍可均衡控制，避免对交流电网造成不平衡扰动。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是现有潮流控制器和柔性直流输电工程某一相出现模组故障后的处理方法流程图。
图2是本申请一实施例的分布式补偿器的协调控制方法流程图。
图3是本申请一实施例的分布式补偿器的协调控制系统结构示意图。
图4是本申请另一实施例的分布式补偿器的协调控制系统的结构示意图。
图5是本申请一实施例的模组热备用状态控制模块的控制方法流程图。
图6是本申请一实施例提供的模组热备用状态控制模块的结构示意图。
图7是本申请另一实施例提供的模组热备用状态控制模块的结构示意图。
图8是本申请一实施例中计算机设备的内部结构图。
具体实施方式
如前所述，在上述的常见分布式补偿器结构中，在单回线运行方式下，三相中某一相出现模组故障后，该相可用模组数减少，若无相间协 调控制，非故障相仍保持原状态运行，三相电压源型换流器的电压输出将出现不对称，造成三相交流线路等效阻抗不对称，从而会在交流线路中产生零序和负序电流，影响交流线路正常运行。在多回线运行方式下，各回线并联运行，当某一回线出现模组故障后，若各回线间无协调控制，非故障回线仍保持原状态运行，各回线分布式补偿器的电压输出将不均衡，造成各回线等效阻抗不均衡，回线间将产生不对称环流，影响交流系统正常运行。
目前，采用模块化多电平换流器的潮流控制器或柔性直流输电工程，针对某一相出现模组故障的情况，采用的处理方式多没有相间协调控制，而是在故障相中投入冗余模组来代替被旁路的故障模组，当故障模组数超过了设定的冗余模组数时，即会触发换流器闭锁。分布式补偿器无特定的冗余设计，每个串联模组均可单独运行，换流器具备单模组运行的能力，所有只有当某一相串联模组全部故障时才需要触发换流器闭锁。
因此，当分布式补偿器某一相出现模组故障时，为了充分利用分布式补偿器的冗余性和灵活性，避免模组故障引起的三相不对称和各回线不均衡问题，需要一种可以快速、平稳地处理分布式补偿器各相模组故障的协调控制方法，保证出现模组故障后，各回线各相仍可均衡控制。
现在将参考附图更全面地描述示例实施例。然而，示例实施例能够以多种形式实施，且不应被理解为限于在此阐述的实施例。相反，提供这些实施例使得本申请变得全面和完整，并将示例实施例的构思全面地传达给本领域的技术人员。在图中相同的附图标记表示相同或类似的部分，因而将省略对它们的重复描述。
所描述的特征、结构或特性可以以任何合适的方式结合在一个或更多实施例中。在下面的描述中，提供许多具体细节从而给出对本公开的实施例的充分理解。然而，本领域技术人员将意识到，可以实践本公开的技术方案而没有这些特定细节中的一个或更多，或者可以采用其它的方式、组元、材料、装置或等。在这些情况下，将不详细示出或描述公知结构、方法、装置、实现、材料或者操作。
附图中所示的流程图仅是示例性说明，不是必须包括所有的内容和操作/步骤，也不是必须按所描述的顺序执行。例如，有的操作/步骤还 可以分解，而有的操作/步骤可以合并或部分合并，因此实际执行的顺序有可能根据实际情况改变。
应当理解，本申请的说明书和权利要求书中使用的术语“包括”和“包含”指示所描述特征、整体、步骤、操作、元素和/或组件的存在，但并不排除一个或多个其它特征、整体、步骤、操作、元素、组件和/或其集合的存在或添加。
在本申请中，使用诸如“第一”，“第二”等的序数术语来修饰元件并不表示一个元件相对于另一个元件的任何优先级，位次或顺序，或者执行方法中的动作的时间顺序。除非另外特别说明，否则此类序数词仅用作标签以将具有特定名称的一个元件与具有(除序数词外在一实施例中相同名称的另一元件区分开。在所有附图中，除非在在上下文中另有定义，可以注意到，通过参考标记中的相同的数字标记来表示相似或相同的具有同样功能的部件，通过具有相同数字标记的参考标记的不同字母后缀来区分相似或相同的具有同样功能的部件的不同实施例。
图1是现有潮流控制器和柔性直流输电工程某一相出现模组故障后的处理方法流程图。
如图1所示，若采用该方法，分布式补偿器每一相换流器的N个串联模组中均设定N_RE_N个冗余模组，设定运行模组数为N_OP_N。其中，在换流器正常运行过程中，冗余模组并不输出有效电压。当某一相的某个运行模组出现故障时，将该故障模组旁路，并投入一个冗余模组，剩余冗余模组数N_RE减1，从而保持该相运行模组数保持N_OP_N不变，以维持换流器原有运行状态。当剩余冗余模组数N_RE为0时，该相换流器冗余模组耗尽，换流器闭锁。其中，N_RE_N+N_OP_N＝N，三个数为确定的正整数；N_RE是一个在位于N_RE_N和0之间的自然数，会根据故障模组数发生变化，具体关系为N_RE＝N_RE_N–故障模组数。
由于分布式补偿器每个串联模组均可单独运行，换流器具备单模组运行的能力，故采用上述方法时，分布式补偿器的冗余性和灵活性未能充分利用。
本申请各示例性实施例提供一种分布式补偿器的协调控制方法、系统、计算机设备及存储介质，从而保证某一回线的某一相出现模组故障 后，各回线、各相仍可均衡控制，保证分布式补偿器仍能正常运行，同时避免对交流电网造成不平衡扰动。
本申请旨在提供一种分布式补偿器的协调控制方法、系统、计算机设备及存储介质，从而能够快速、平稳地处理分布式补偿器的各相模组故障，保证某一回线的某一相出现模组故障后，各回线、各相仍可均衡控制，避免对交流电网造成不平衡扰动。
下面将参照附图，对根据本申请实施例的分布式补偿器的协调控制方法及系统进行详细说明。
图2示出根据本申请一实施例的分布式补偿器的协调控制方法流程图。
参见图2，步骤S210，配置分布式补偿器。
由分别串联接入三相交流线路的换流器构成所述分布式补偿器，各相所述换流器分别由多级模组依次串联构成。
步骤S220，检测各相换流器的每级模组的运行状态。
在所述分布式补偿器正常运行的过程中，实时检测各相的所述换流器的所述多级模组中的各级模组的运行状态，以获得所述各相的第一模组个数，其中，所述第一模组个数分别为所述各相的所述换流器中具备正常运行条件且无故障的可用模组个数。
步骤S230，计算分布式补偿器可有效输出电压的模组个数。
实时计算所述分布式补偿器的可有效输出电压的第二模组个数，其中，所述第二模组个数等于各相中的所述第一模组个数中的最小值。
步骤S240，模组故障时闭锁旁路。
当检测到任一相的换流器的任一级模组故障时，闭锁并旁路发生故障的所述模组，同时将故障相的第一模组个数减一，并保持非故障相第一模组个数不变。
步骤S250，将需要转换的模组转为热备用状态。
将各相中的第一模组个数分别与第二模组个数进行对比，若所述第一模组个数大于所述第二模组个数，则将所述第一模组个数的第一模组所在相的换流器中的需要转为热备用状态的模组转为热备用状态，
其中，需要转为热备用状态的模组的个数等于所述需要转为热备用 状态的模组所在相的第一模组个数减去所述第二模组个数。
在一实施例中，所述换流器是三相电压源型换流器。
在一实施例中，所述实时计算所述分布式补偿器的可有效输出电压的所述第二模组个数的步骤包括：确定所述第二模组个数等于所述单回交流线路中的所述各相的第一模组个数的最小值作为所述第二模组个数。
在一实施例中，所述实时计算所述分布式补偿器的可有效输出电压的所述第二模组个数的步骤包括：接收所述第二模组个数等于每条所述并联的多回交流线路中的各相的第一模组个数的最小值，从所述接收的最小值中再确定最小值作为所述第二模组个数。
图3示出根据本申请一实施例的分布式补偿器的协调控制系统结构示意图。
参见图3，在每条回线中，分布式补偿器包括分别串联接入三相交流线路的换流器，各相换流器分别由多级模组依次串联构成。在本实施例中，协调控制系统包括M条回线，每条回线中分别串联接入三相交流线路的换流器，各相的换流器分别由N级的单元模组依次串联构成。例如，在回线1中，各相的换流器包括第一级单元模组、第二级单元模组，至第N级单元模组。
图4示出根据本申请一实施例的分布式补偿器的协调控制系统的结构示意图。
参见图4，分布式补偿器的协调控制系统包括模组状态监视模块10、有效模组数计算模块20、模组热备用状态控制模块30和多回线间通讯模块40。
如图4所示，模组状态监视模块10，配置为实时检测分布式补偿器中各相换流器中各级的模组的运行状态，并将每级所述模组的运行状态传递给有效模组数计算模块20。多回线间通讯模块40仅在所述分布式补偿器为多回线运行方式时生效，汇总每条所述并联的多回交流线路中的各相所述换流器的可用模组数的最小值，并将所述可用模组数的最小值传递给有效模组数计算模块20。可以理解的是，对于单回线运行方式，可以省去多回线间通讯模块40。
如图4所示，有效模组数计算模块20，配置为根据各级的模组的运 行状态，实时计算各相所述换流器的可用模组数，实时计算分布式补偿器的可有效输出电压的第二模组个数，其中所述第一模组个数为所述各相的所述换流器的具备正常运行条件且无故障的可用模组数，并将可有效输出电压的模组个数传递给模组热备用状态控制模块30。
如图4所示，模组热备用状态控制模块30，配置为实时计算各相所述换流器中需要转为热备用状态的模组的个数，并将各相的所述换流器中的需要转为热备用状态的模组转为热备用状态，其中，各相所述换流器中需要转为热备用状态的模组个数等于各相所述换流器的可用模组个数减去所述分布式补偿器可有效输出电压的模组个数。
在一实施例中，每级模组的运行状态包括模组解锁、模组闭锁和模组故障。
关于分布式补偿器的协调控制系统的具体限定可以参见上文中对于分布式补偿器的协调控制方法的限定，在此不再赘述。上述分布式补偿器的协调控制系统中的各个模块可全部或部分通过软件、硬件及其组合来实现。上述各模块可以硬件形式内嵌于或独立于计算机设备中的处理器中，也可以以软件形式存储于计算机设备中的存储器中，以便于处理器调用执行以上各个模块对应的操作。
图5示出根据本申请一实施例的模组热备用状态控制模块的控制方法流程图。
参见图5，步骤S510，接收模组状态数据。
模组热备用状态控制模块配置为接收传递来的各相换流器的可用模组个数信号和分布式补偿器可有效输出电压的模组个数信号。
步骤S520，计算需要转为热备用状态的模组个数。
模组热备用状态控制模块配置为实时计算各相所述换流器中需要转为热备用状态的模组个数，其中，各相所述换流器中需要转为热备用状态的模组个数等于各相所述换流器的可用模组个数减去所述分布式补偿器可有效输出电压的模组个数。
步骤S530，检测一模组是否需要转为热备用状态。
如果存在需要转换为热备用状态的模组，模组热备用状态控制模块配置为先判断当前模组是否故障，若无故障则转为热备用状态，热备用 状态的模组数量减少1。
步骤S540，依次检测模组直至无模组需要转为热备用状态。
依次判断各模组状态，直至需要转换为热备用状态的模组数量为零。例如，若检测的模组有故障则继续判断下一模组，热备用状态的模组数量减少1。如图6所示，若本相换流器的可用模组个数大于分布式补偿器有效投入模组个数，则先判断第1级模组是否故障，若无故障则转为热备用状态，若有故障则继续判断第2级模组，依次类推，直至热备用模组数等于本相换流器的可用模组个数减去分布式补偿器有效投入模组个数。
可替换地，如图7所示，若本相换流器的可用模组个数大于分布式补偿器有效投入模组个数，则先判断第N级模组是否故障，若无故障则转为热备用状态，若有故障则继续判断第N-1级模组，依次类推，直至热备用模组数等于本相换流器的可用模组个数减去分布式补偿器有效投入模组个数。
本申请各示例性实施例，还提供了一种计算机设备，包括存储器和处理器，存储器中存储有计算机程序，该处理器执行计算机程序时实现本申请各实施例提供的分布式补偿器的协调控制方法的步骤。可以理解以理解的是，所实现的控制方法的步骤并不限于上述的各示例性实施例，而是说还可以例如实现额外的和可选的其他操作/步骤，并且有的操作/步骤还可以分解，而有的操作/步骤可以合并或部分合并，因此实际执行的顺序有可能根据实际情况改变。
在一个实施例中，提供了一种计算机设备，该计算机设备可以是终端，其内部结构图可以如图8所示。该计算机设备包括通过系统总线连接的处理器、存储器、网络接口、显示屏和输入装置。其中，该计算机设备的处理器用于提供计算和控制能力。该计算机设备的存储器包括非易失性存储介质、内存储器。该非易失性存储介质存储有操作系统和计算机程序。该内存储器为非易失性存储介质中的操作系统和计算机程序的运行提供环境。该计算机设备可以包括网络接口，该网络接口用于与外部的终端通过网络连接通信。该计算机程序被处理器执行时以实现上述分布式补偿器的协调控制方法。该计算机设备还可以包括显示屏，该 显示屏可以是液晶显示屏或者电子墨水显示屏，该计算机设备的输入装置可以是显示屏上覆盖的触摸层，也可以是计算机设备外壳上设置的按键、轨迹球或触控板，还可以是外接的键盘、触控板或鼠标等。
本领域技术人员可以理解，图8中示出的结构，仅仅是与本申请方案相关的部分结构的框图，并不构成对本申请方案所应用于其上的计算机设备的限定，具体的计算机设备可以包括比图中所示更多或更少的部件，或者组合某些部件，或者具有不同的部件布置。
本申请各示例性实施例，还提供了一种计算机可读存储介质，其上存储有计算机程序，计算机程序被处理器执行时实现本申请各实施例提供的分布式补偿器的协调控制方法的步骤。可以理解以理解的是，所实现的控制方法的步骤并不限于上述的各示例性实施例，而是说还可以例如实现额外的和可选的其他操作/步骤，并且有的操作/步骤还可以分解，而有的操作/步骤可以合并或部分合并，因此实际执行的顺序有可能根据实际情况改变。
以上对本申请实施例进行了详细描述和解释。应清楚地理解，本申请描述了如何形成和使用特定示例，但本申请不限于这些示例的任何细节。相反，基于本申请公开的内容的教导，这些原理能够应用于许多其它实施例。
通过对示例实施例的描述，本领域技术人员易于理解，根据本申请实施例的技术方案至少具有以下优点中的一个或多个。
根据本申请的一些实施例，本申请可以实现分布式补偿器的协调控制：当某一回线分布式补偿器的某一相出现模组故障后，迅速将故障相的故障模组旁路，同时更新各回线各相可用模组数，并实时计算各回线有效投入模组数，并根据各相可用模组数和各回线有效投入模组数，选择对应数量的模组转为热备用状态，从而保证各回线各相可有效输出电压的模组个数保持一致，进而保证各相输出一致，实现各回线各相协调均衡控制。
根据本申请的一些实施例，本申请的分布式补偿器的协调控制方法可以快速、平稳地处理分布式补偿器的模组故障，保证各回线各相在某一相出现模组故障后仍可均衡控制，避免对交流电网造成不平衡扰动。
本申请所使用的对存储器、存储、数据库或其它介质的任何引用可包括非易失性和/或易失性存储器。合适的非易失性存储器可包括只读存储器(ROM)、可编程ROM(PROM)、电可编程ROM(EPROM)、电可擦除可编程ROM(EEPROM)或闪存。易失性存储器可包括随机存取存储器(RAM)，它用作外部高速缓冲存储器。作为说明而非局限，RAM以多种形式可得，诸如静态RAM(SRAM)、动态RAM(DRAM)、同步DRAM(SDRAM)、双数据率SDRAM(DDR SDRAM)、增强型SDRAM(ESDRAM)、同步链路(Synchlink)DRAM(SLDRAM)、存储器总线(Rambus)直接RAM(RDRAM)、直接存储器总线动态RAM(DRDRAM)、以及存储器总线动态RAM(RDRAM)。
以上具体地示出和描述了本申请的示例性实施例。应可理解的是，本申请不限于这里描述的详细结构、设置方式或实现方法。相反，本申请意图涵盖包含在所附权利要求的精神和范围内的各种修改和等效设置。

Claims (16)

  1. 一种分布式补偿器的协调控制方法，其中，所述分布式补偿器由分别串联接入三相交流线路的换流器构成，接入各相的所述换流器分别由多级模组依次串联构成，所述方法包括：
    在所述分布式补偿器正常运行的过程中，实时检测各相的所述换流器的所述多级模组中的各级模组的运行状态，以获得所述各相的第一模组个数，其中，所述第一模组个数分别为所述各相的所述换流器中具备正常运行条件且无故障的可用模组个数；
    实时计算所述分布式补偿器的可有效输出电压的第二模组个数，其中，所述第二模组个数等于所述各相中的所述第一模组个数中的最小值；
    当任一相所述换流器的任一级模组故障时，闭锁并旁路所述发生故障的模组，同时将所述故障相的第一模组个数减一，并保持非故障相的第一模组个数不变；以及
    将所述各相中的所述第一模组个数分别与所述第二模组个数进行对比，若所述第一模组个数大于所述第二模组个数，则将所述大于所述第二模组个数的第一模组所在相的换流器中的需要转为热备用状态的模组转为热备用状态，其中，所述需要转为热备用状态的模组的个数等于所述需要转为热备用状态的模组所在相的第一模组个数减去所述第二模组个数。
  2. 根据权利要求1所述的方法，其中，所述分布式补偿器是单回线运行方式，仅单回交流线路串联接入所述分布式补偿器。
  3. 根据权利要求2所述的方法，其中，所述实时计算所述分布式补偿器的可有效输出电压的所述第二模组个数的步骤包括：
    确定所述第二模组个数等于所述单回交流线路中的所述各相的所述第一模组个数的最小值作为所述第二模组个数。
  4. 根据权利要求1所述的方法，其中，所述分布式补偿器是多回线运行方式，并联的多回交流线路均串联接入所述分布式补偿器。
  5. 根据权利要求4所述的方法，其中，所述实时计算所述分布式补偿器的可有效输出电压的所述第二模组个数的步骤包括：
    接收所述第二模组个数等于每条所述并联的多回交流线路中的所述各相的所述第一模组个数的最小值，从所述接收的最小值中再确定最小值作为所述第二模组个数。
  6. 根据权利要求1所述的方法，其中，所述方法还包括：
    当所述需要转为热备用状态的模组的个数大于或等于1时，依次判断所述需要转为热备用状态的模组所在相的所述各级模组是否有故障，若当前模组无故障，则将所述当前模组转为所述热备用状态，并且所述需要转为热备用状态的模组的个数减少1。
  7. 根据权利要求6所述的方法，其中，所述当所述需要转为热备用状态的模组的个数大于或等于1时，依次判断所述需要转为热备用状态的模组所在相的所述各级模组是否有故障的步骤，包括：
    当所述当前模组有故障，所述当前模组不转为所述热备用状态，所述需要转为热备用状态的模组的个数不变。
  8. 根据权利要求1所述的方法，其中，所述方法还包括：
    当所述需要转为热备用状态的模组的个数等于零时，保持所述需要转为热备用状态的模组所在相的各级模组运行状态不变，并保持实时计算该相的所述需要转为热备用状态的模组的个数的步骤。
  9. 根据权利要求1所述的方法，其中，所述热备用状态为，
    将所述需要转为热备用状态的模组解锁运行且具备电压输出能力，但保持所述需要转为热备用状态的模组的端口的输出电压为0的状态。
  10. 根据权利要求1所述的方法，其中，所述换流器是电压源型换流器。
  11. 一种分布式补偿器的协调控制系统，其中，所述分布式补偿器包括分别串联接入三相交流线路的换流器，各相的所述换流器由多级模组依次串联构成，其中，所述协调控制系统包括：
    模组状态监视模块，配置为实时检测所述分布式补偿器中所述各相的所述换流器中的各级的模组的运行状态；
    有效模组数计算模块，配置为根据所述各级的模组的运行状态，实时计算所述各相的第一模组个数，实时计算所述分布式补偿器的可有效输出电压的第二模组个数，其中所述第一模组个数为所述各相的所述换 流器的具备正常运行条件且无故障的可用模组数；以及
    模组热备用状态控制模块，配置为实时计算所述各相的所述换流器中需要转为热备用状态的模组的个数，将所述各相的所述换流器中的所述需要转为热备用状态的模组转为热备用状态。
  12. 根据权利要求11所述的协调控制系统，其中，所述协调控制系统还包括：
    多回线间通讯模块，配置为仅在所述分布式补偿器为多回线运行方式时生效，并确定各条并联的多回交流线路中的第一模组个数的最小值。
  13. 根据权利要求11所述的协调控制系统，其中，所述模组热备用状态控制模块配置为实时计算所述各相的所述换流器中需要转为热备用状态的模组个数，当所述各相中的一相中的所述需要转为热备用状态的模组个数为零时，则所述一相中没有模组转为热备用状态。
  14. 根据权利要求11所述的协调控制系统，其中，所述运行状态包括模组解锁、模组闭锁和模组故障。
  15. 一种计算机设备，包括存储器和处理器，所述存储器存储有计算机程序，其中，所述处理器执行所述计算机程序时实现权利要求1至10中任一项所述方法的步骤。
  16. 一种计算机可读存储介质，其上存储有计算机程序，其中，所述计算机程序被处理器执行时实现权利要求1至10中任一项所述的方法的步骤。
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