CN112865112B - Energy storage type shore power system for port - Google Patents

Abstract

The present invention relates to the technical field of port shore power, in particular to a port energy storage type shore power system, including: AC bus, shore power bidirectional converter, DC bus, shore power socket box, energy storage system and EMS management system, shore power The electric bidirectional converter includes a rectifier module and an inverter module, the input end of the rectifier module is connected to the AC bus through the first transformer; the DC bus is connected to the output end of the rectifier module, and the input end of the inverter module is connected to the DC bus; The shore power outlet box is connected to the output end of the inverter module through the second transformer; the energy storage system is connected to the DC bus; and the EMS management system is connected to each of the energy storage system, the rectifier module and the inverter module. In the present invention, the energy storage system and the shore power share the input, output, busbar and control unit, which can significantly reduce the investment of the energy storage system, improve the utilization rate of the energy storage system, and further enable the shore power system to reduce the electricity price through the peak-valley electricity price difference. The problem of low utilization rate of shore power facilities.

Description

Port energy storage shore power system

technical field

The invention relates to the technical field of port shore power, in particular to a port energy storage type shore power system.

Background technique

In today's world, the trade between countries is very frequent, and the maritime transportation with ships as the main body has become the most important means of transportation for maritime trade among countries in the world. But at the same time, sea transportation has also generated serious environmental pollution problems. As governments and people all over the world are calling for protection and improvement of the environment, more and more attention has been paid to solving the pollution problem during the ship's berthing. It is becoming more and more important to seek specific and effective solutions to ensure the normal operation of ships while they are berthed in port, and to reduce the huge pollution generated by ships’ power generation. Under this background, ship shore power technology has emerged as the times require. This technology is mainly to install system-related equipment on the ship, and connect it to the power supply when it is docked, so as to supply power to the ship.

With the progress of shore power construction in various places, the phenomenon of low access rate after the completion of the current shore power construction has generally existed. According to the calculation, if the ship does not use the shore power system to supply power, but still uses diesel generators to generate electricity, then its power generation cost is 0.7 yuan/(kwh). 1.0 yuan/(kwh), the cost is relatively high, so the price of electricity received and supplied is inverted. The upside-down price of power receiving and power supply has seriously affected the willingness of shore and ships to connect to power. After the completion of shore power facilities, they have gradually evolved into silent assets of ports and terminals, which are somewhat different from the relevant calculations at the initial stage of construction. Therefore, it is impossible to attract shipping companies to apply the system, resulting in the economic benefits of using shore power for ports and ships. This further increases the difficulty of promoting shore power, and most of the completed port shore power is idle.

In order to better solve the problem of low utilization rate of shore power facilities and improve the income of investors, the access of new energy power generation can be considered, and energy storage devices can be used to cut peaks and fill valleys, and reduce electricity prices. The shore power system with the interface between energy storage devices and new energy power generation, but there are still problems in related technologies such as large investment in energy storage devices and low utilization rate, which leads to the inability of the shore power system to fully reduce the electricity price through the peak-valley power price difference. The problem of low facility utilization.

Contents of the invention

The present invention is based on the inventor's discovery and recognition of the following facts and problems:

The energy storage system and shore power in the related art use converters and input and output devices to supply power to the ship's side equipment separately, which has the problem of large investment and low utilization rate of the energy storage device, which leads to the inability of the shore power system to fully pass through peaks and valleys. The electricity price difference lowers the electricity price, and the utilization rate of shore power facilities is low.

The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

For this reason, the embodiment of the present invention proposes a port energy storage type shore power system, including: AC bus, shore power bidirectional converter, DC bus, shore power socket box, energy storage system and EMS management system,

Wherein the shore power bidirectional converter includes a rectifier module and an inverter module, and the input end of the rectifier module is connected to the AC bus through a first transformer;

Wherein the DC bus is connected to the output terminal of the rectifier module, and the input terminal of the inverter module is connected to the DC bus;

Wherein the shore power outlet box is connected to the output end of the inverter module through a second transformer;

Wherein the energy storage system is connected to the DC bus;

Wherein the EMS management system is connected to each of the energy storage system, the rectifier module and the inverter module.

According to the port energy storage type shore power system of the embodiment of the present invention, the energy storage system and the shore power share the input, output, busbar and control unit. In addition, the energy storage system and the shore power can also share the box, auxiliary equipment, etc., which can Significantly reduce the investment of energy storage system and improve the utilization rate of energy storage system. The low utilization rate of shore power facilities can be solved in terms of valley electricity price difference and lower electricity price, so as to improve the investment income of shore power and promote the development of smart power supply for ships in ports.

In some embodiments, the port energy storage type shore power system further includes a new energy power generation access interface, and the new energy power generation access interface is connected to the output end of the inverter module through the second transformer, The new energy power generation access interface is connected to the EMS management system.

In some embodiments, the new energy power generation access interface is connected to a wind power generation system, a photovoltaic power generation system, a tidal power generation system and a distributed gas power generation system.

In some embodiments, the port energy storage type shore power system also includes a DC charging pile, an AC charging pile and an office power interface;

Wherein the DC charging pile is connected to the input end of the inverter module;

Wherein the AC charging pile and the office power interface are connected to the output end of the inverter module through the second transformer;

Each of the DC charging pile, the AC charging pile and the office power interface is connected to the EMS management system.

In some embodiments, the port energy storage shore power system further includes a common DC charging station connected to the DC bus, and the common DC charging station is connected to the EMS management system.

In some embodiments, the shore power bidirectional converter includes a plurality of rectifier modules and a plurality of inverter modules.

In some embodiments, the rectifier module is connected to the first transformer through a switch, and the inverter module is connected to the second transformer through a switch.

In some embodiments, both the rectifier module and the inverter module are full-control devices.

In some embodiments, the energy storage system includes an energy storage lithium battery system and/or a power battery system.

In some embodiments, the EMS management system includes an EMS server and a control network.

Description of drawings

Fig. 1 is a schematic diagram of a port energy storage shore power system according to an embodiment of the present invention.

Reference numerals: 1 is an energy storage system, 2 is a shore power bidirectional converter, 21 is a rectifier module, 22 is an inverter module, 3 is an AC/DC microgrid system, 31 is a DC charging pile, 32 is an AC charging pile , 33 is the office power interface, 34 is the new energy power generation access interface, 4 is the first transformer, 5 is the common DC charging station, 6 is the EMS management system, 7 is the shore power socket box, 8 is the second transformer, 9 10 is a wind power generation system, 11 is a tidal power generation system, 12 is a distributed gas power generation system, 13 is an AC bus, and 14 is a DC bus.

Detailed ways

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

Referring to Fig. 1, an embodiment of the present invention proposes a port energy storage type shore power system, including: AC bus 13, shore power bidirectional converter 2, DC bus 14, shore power socket box 7, energy storage system 1 and EMS The management system 6, the EMS management system 6 is an energy management system.

The shore power bidirectional converter 2 includes a rectifier module 21 and an inverter module 22 , and the input end of the rectifier module 21 is connected to the AC bus 13 through the first transformer 4 .

The DC bus 14 is connected to the output end of the rectifier module 21 , and the input end of the inverter module 22 is connected to the DC bus 14 .

The shore power socket box 7 is connected to the output end of the inverter module 22 through the second transformer 8 .

The energy storage system 1 is connected to a DC bus 14 .

The EMS management system 6 is connected to each of the energy storage system 1 , the rectifier module 21 and the inverter module 22 .

According to the port energy storage type shore power system according to the embodiment of the present invention, the energy storage system and the shore power share the shore power bidirectional converter, the DC bus, the first transformer, the second transformer, the shore power socket box and the EMS management system, which is equivalent to The energy storage system and the shore power share the input, output, busbar and control unit. In addition, the energy storage system and the shore power can also share the cabinet and auxiliary equipment when setting up, which can significantly reduce the investment of the energy storage system and improve the utilization of the energy storage system. The energy storage system can use the peak-valley electricity price difference to carry out arbitrage, reduce the electricity price and the operating cost of shore-based power supply facilities and even the entire port, and then enable the shore power system to solve the low utilization rate of shore power facilities through the peak-valley electricity price difference and reduce electricity prices. In order to improve the investment income of shore power and promote the development of smart power supply for ships in ports.

As a power supply device, the energy storage system can also provide short-term static expansion for power receiving equipment, saving transformer transformation costs and reducing costs.

In addition, the port energy storage shore power system can also solve the problem of reverse power. When the shore power system and the ship's side power supply are connected to the grid, the reverse power from the ship's side can be directly stored in the energy storage system without being used as "harmful energy". For special treatment.

In some embodiments, the port energy storage type shore power system also includes a new energy power generation access interface 34, the new energy power generation access interface 34 is connected to the output end of the inverter module 22 through the second transformer 8, and the new energy power generation connection The input interface 34 is connected with the EMS management system 6 .

The new energy power generation access interface 34 is connected with the wind power generation system 10, the photovoltaic power generation system 9, the tidal power generation system 11 and the distributed gas power generation system 12, etc. The gas-fired power generation system 12 may additionally be provided with an access interface directly connected to the AC bus.

According to the port energy storage type shore power system of this embodiment, the new energy power generation access interface is directly connected to the output end of the inverter module, which is equivalent to the off-grid type of new energy power generation connection, which is convenient to control and has good stability. It avoids the impact of power fluctuations on the power grid, realizes the highly reliable supply of shore power systems with various forms of energy, realizes active distribution networks, and transitions traditional power grids to smart grids.

In some embodiments, the port energy storage shore power system further includes a DC charging pile 31 , an AC charging pile 32 and an office power interface 33 .

Wherein the DC charging pile 31 is connected to the input end of the inverter module 22; the AC charging pile 32 and the office power interface 33 are connected to the output end of the inverter module 22 through the second transformer; the DC charging pile 31, the AC charging pile 32 Each of the office electrical interfaces 33 is connected with the EMS management system 6 .

According to the port energy storage type shore power system of this embodiment, the port energy storage type shore power system makes full use of the energy storage system to connect new energy generation to the interface, DC charging pile, AC charging pile and office power interface to build the shore power system. Become an AC/DC microgrid system3.

In some embodiments, the port energy storage type shore power system also includes a common DC charging station 5, the common DC charging station can be an AC charging station or a DC charging station, and the common DC system used by the common DC charging station 5 can be DC Output (using DC-DC module), or AC output (using DC-AC module, that is, inverter module), the common DC charging station 5 is connected to the DC bus 14, and the common DC charging station 5 and the EMS management system 6 connected.

According to the port energy storage type shore power system of this embodiment, the common DC charging station can use the newly built lithium battery energy storage system or ladder battery energy storage system (power battery cascade utilization) to expand into a combination of wind, light, storage and charging. The hybrid charging station can replace the cutting-edge facilities of the terminal (such as air conditioners, fresh air fans, lighting and other power loads) with DC power supply, which is more convenient to use.

In some embodiments, the shore power bidirectional converter 2 includes multiple rectifier modules 21 and multiple inverter modules 22 .

According to the port energy storage type shore power system of this embodiment, when the energy storage system supplies power to the shore power socket box, there are multiple inverters for backup, which can ensure the power supply compared with separately equipped with a bidirectional converter for the energy storage system reliability.

In some embodiments, the rectifier module 21 is connected to the first transformer 4 through a switch, and the inverter module 22 is connected to the second transformer 8 through a switch.

In some embodiments, both the rectifier module 21 and the inverter module 22 are full-control devices.

According to the port energy storage type shore power system of this embodiment, it is convenient to control the rectifier module and the inverter module through the EMS management system.

In some embodiments, the energy storage system 1 includes an energy storage lithium battery system and/or a power battery system.

According to the port energy storage type shore power system of this embodiment, the energy storage system is set as an energy storage battery system, and the energy storage battery system can be configured as a brand-new energy storage type lithium battery system, or new energy electric vehicles and electric trucks can also be used. Trailer decommissioning power battery system.

In some embodiments, the EMS management system 6 includes an EMS server and a control network, and the control network may be wired or wireless.

In some specific examples, as shown in Figure 1, a port energy storage shore power system includes: AC bus 13, shore power bidirectional converter 2, DC bus 14, shore power socket box 7, energy storage system 1 and the EMS management system 6, wherein the AC bus 13 is an AC bus of 10KV/50HZ.

Among them, the shore power bidirectional converter 2 uses a four-quadrant converter. The shore power bidirectional converter is used as the shore power frequency conversion system, which can realize the bidirectional flow of power. The shore power bidirectional converter 2 includes a rectifier module 21 and an inverter. Module 22 , the input end of the rectifier module 21 is connected to the AC bus 13 through the first transformer 4 .

The DC bus 14 is connected to the output end of the rectifier module 21 , and the input end of the inverter module 22 is connected to the DC bus 14 .

The shore power socket box 7 is connected to the output end of the inverter module 22 through the second transformer 8 .

Wherein the energy storage system 1 is connected to the DC bus 14 .

The port energy storage type shore power system also includes a new energy power generation access interface 34, which is connected to the output end of the inverter module 22 through the second transformer 8, and the new energy power generation access interface 34 is connected to the wind power generation The system 10, the photovoltaic power generation system 9, the tidal power generation system 11 and the distributed gas power generation system 12 are connected.

The port energy storage shore power system also includes a DC charging pile 31 , an AC charging pile 32 and an office power interface 33 .

The DC charging pile 31 is connected to the input end of the inverter module 22 ; the AC charging pile 32 and the office power interface 33 are connected to the output end of the inverter module 22 through the second transformer 8 .

The port energy storage shore power system also includes a common DC charging station 5 , which can be an AC charging station or a DC charging station, and the common DC charging station 5 is connected to the DC bus 14 .

The number of rectifier modules 21 and the number of inverter modules 22 are determined according to the required capacity of an actual project.

The rectifier module 21 is connected to the first transformer 4 through a switch; the inverter module 22 is connected to the second transformer 8 through a switch.

Both the rectifier module 21 and the inverter module 22 are full-control devices.

Each of the energy storage system 1, shore power bidirectional converter 2, new energy power generation access interface 34, DC charging pile 31, AC charging pile 32, office power interface 33, and common DC charging station 5 is managed by EMS The systems 6 are connected, and the EMS management system 6 includes an EMS server and a control network, and the EMS management system manages each module of the shore power system through the EMS server.

The energy storage system in the port energy storage type shore power system of this embodiment can use the difference in peak and valley electricity prices for arbitrage, and charge the energy storage system through the EMS server during the valley price electricity fee period, and during the peak electricity fee period or power outage during the berthing of the ship When using the EMS server, the energy storage system can provide power supply to the shore power socket box, and there are multiple inverters for backup, which can ensure the reliability of power supply.

At the same time, during the peak electricity rate period or power outage during the docking period of the ship, the EMS server can be used to make the energy storage system transfer to the AC/DC microgrid system 3 (new energy generation access interface, DC charging pile, AC charging pile, office power interface) And common DC charging station power supply, which can reduce the electricity cost of the whole port and improve the utilization rate of shore power.

The new energy power generation access interface in this embodiment is connected to wind power generation, photovoltaic power generation, tidal power generation or small distributed gas power generation, and the new energy power generation access interface can provide power supply to the shore power socket box. After the extra power is generated, the EMS server can also be used to supply power to the energy storage system to store the excess power. At the same time, it can also provide power to DC charging piles, AC charging piles, and office power interfaces, which will improve the consumption of new energy. ability.

The port energy storage-type shore power system in this embodiment uses the energy storage system to expand into a hybrid charging station integrating wind, light, storage and charging, which promotes the large-scale access of distributed power and renewable energy, and realizes the multi-load The highly reliable supply of the shore power system in various energy forms reduces the cost of electricity, realizes green production, realizes the active distribution network, and makes the transition from the traditional power grid to the smart grid.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; can be mechanically connected, can also be electrically connected or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediary, can be the internal communication of two components or the interaction relationship between two components, Unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

As used herein, the terms "one embodiment," "some embodiments," "example," "specific examples," or "some examples" mean specific features, structures, materials, or features described in connection with the embodiment or example. A feature is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (8)

1. A port energy storage type shore power system, characterized in that it comprises: AC bus; A shore power bidirectional converter, the shore power bidirectional converter includes a rectifier module and an inverter module, the input end of the rectifier module is connected to the AC bus through a first transformer; a DC bus, the DC bus is connected to the output end of the rectifier module, and the input end of the inverter module is connected to the DC bus; Shore power socket box, the shore power socket box is connected to the output end of the inverter module through the second transformer, when the energy storage system supplies power to the shore power socket box, there are multiple inverters for backup; An energy storage system, the energy storage system is connected to the DC bus, wherein the energy storage system and the shore power share the shore power bidirectional converter, the DC bus, the first transformer, the second transformer, the shore power socket box and EMS management system; and an EMS management system connected to each of the energy storage system, the rectifier module and the inverter module; The rectifier module is connected to the first transformer through a switch, and the inverter module is connected to the second transformer through a switch; The shore power bidirectional converter includes multiple rectifier modules and multiple inverter modules. 2. The port energy storage type shore power system according to claim 1, characterized in that, the port energy storage type shore power system also includes a new energy power generation access interface, and the new energy power generation access interface passes through the The second transformer is connected to the output end of the inverter module, and the new energy power generation access interface is connected to the EMS management system. 3. The port energy storage shore power system according to claim 2, wherein the new energy power generation access interface is connected to a wind power generation system, a photovoltaic power generation system, a tidal power generation system and a distributed gas power generation system. 4. The port energy storage type shore power system according to claim 1, characterized in that, the port energy storage type shore power system also includes a DC charging pile, an AC charging pile and an office power interface; wherein The DC charging pile is connected to the input end of the inverter module; The AC charging pile and the office power interface are connected to the output end of the inverter module through the second transformer; Each of the DC charging pile, the AC charging pile and the office power interface is connected to the EMS management system. 5. The port energy storage type shore power system according to claim 1, characterized in that, the port energy storage type shore power system also includes a common DC charging station, and the common DC charging station is connected to the DC bus , the common DC charging station is connected to the EMS management system. 6. The port energy storage type shore power system according to claim 1, wherein the rectifier module and the inverter module are all fully-controlled devices. 7. The port energy storage shore power system according to claim 1, wherein the energy storage system includes an energy storage lithium battery system and/or a power battery system. 8. The port energy storage type shore power system according to any one of claims 1-7, wherein the EMS management system includes an EMS server and a control network.

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