Hybrid power supply control system

Abstract

The utility model provides a hybrid power supply control system. The system comprises power distribution equipment, an energy storage inverter and energy storage equipment, a first alternating-current input end of the power distribution equipment is connected with an alternating-current output end of a power grid, a second alternating-current input end of the power distribution equipment is connected with an alternating-current output end of the diesel generating set, an alternating-current output end of the power distribution equipment is connected with a first alternating-current input end of the energy storage inverter, and a direct-current end of the energy storage inverter is connected with a direct-current end of the energy storage equipment. And the alternating current output end of the energy storage inverter is connected with the load so as to supply power to the load. According to the system, rapid switching between diesel power generation and power grid commercial power can be realized, and meanwhile, cooperative use of the energy storage equipment is realized, so that continuous power is provided for the load, and the operation time of the diesel generator is reduced in a scene that the commercial power is unstable, so that noise pollution and pollution emission of the diesel generator are reduced.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and more specifically, to a hybrid power supply control system. Background Technology

[0002] In many applications, such as industrial facilities, hospitals, and data centers, the stability and reliability of power supply are paramount. These locations typically rely on mains power as their primary source of electricity. However, mains power can be interrupted by natural disasters, equipment failures, or other reasons. To ensure continuous power supply, diesel generators are often used as backup power sources.

[0003] However, prolonged use of diesel generators to power loads can result in problems such as high noise levels and high pollution emissions. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a hybrid power supply control system that, in the event of unstable mains power, not only achieves a continuous power supply but also reduces the operating time of the diesel generator, thereby reducing noise pollution and emissions from the diesel generator.

[0005] In a first aspect, a hybrid power supply control system is provided, which may include: power distribution equipment, an energy storage inverter, and an energy storage device; the power distribution equipment includes a first AC input terminal, a second AC input terminal, and an AC output terminal; the energy storage inverter includes a first AC input terminal, a DC terminal, and an AC output terminal; the energy storage device includes a DC terminal.

[0006] The first AC input terminal of the power distribution equipment is connected to the AC output terminal of the power grid, and the second AC input terminal of the power distribution equipment is connected to the AC output terminal of the diesel generator set.

[0007] The AC output terminal of the power distribution equipment is connected to the first AC input terminal of the energy storage inverter.

[0008] The DC terminal of the energy storage inverter is connected to the DC terminal of the energy storage device, and the AC output terminal of the energy storage inverter is connected to the load.

[0009] In one possible implementation, the power distribution equipment further includes a communication interface; the energy storage inverter further includes a first communication interface and a second communication interface; the energy storage equipment further includes a communication interface.

[0010] The communication interface of the power distribution equipment is connected to the first communication interface of the energy storage inverter, and the second communication interface of the energy storage inverter is connected to the communication interface of the energy storage equipment.

[0011] In one possible implementation, the energy storage inverter includes an AC converter and an inverter; the AC converter includes an input terminal and an output terminal; the inverter includes a DC terminal and an output terminal.

[0012] The input terminal of the AC converter is connected to the AC output terminal of the power distribution equipment through the first AC input terminal of the energy storage inverter; the output terminal of the AC converter is connected to the load through the AC output terminal of the energy storage inverter.

[0013] The DC terminal of the inverter is connected to the DC terminal of the energy storage device through the DC terminal of the energy storage inverter; the output terminal of the inverter is connected to the load through the AC output terminal of the energy storage inverter.

[0014] In one possible implementation, the energy storage inverter further includes a communication module, which includes a first communication interface and a second communication interface;

[0015] The first communication interface of the communication module is connected to the first communication interface of the power distribution equipment.

[0016] The second communication interface of the communication module is connected to the communication interface of the energy storage device.

[0017] In one possible implementation, the energy storage device includes a battery management system and a battery pack assembly; the battery management system includes a communication interface; the battery pack assembly includes a DC terminal;

[0018] The communication interface of the battery management system serves as the communication interface of the energy storage device and is connected to the second communication interface of the communication module.

[0019] The DC terminal of the battery pack assembly is connected to the DC terminal of the inverter.

[0020] In one possible implementation, the power distribution equipment includes a controller, a first relay, and a second relay; the first relay includes an AC input terminal, an AC output terminal, and a control port; the second relay includes an AC input terminal, an AC output terminal, and a control port.

[0021] The controller is connected to the control port of the first relay and the control port of the second relay;

[0022] The AC input terminal of the first relay is connected to the AC output terminal of the power grid through the first AC input terminal of the power distribution equipment;

[0023] The AC input terminal of the second relay is connected to the AC output terminal of the diesel generator set through the second AC input terminal of the power distribution equipment;

[0024] The AC output terminals of the first relay and the second relay are connected to the AC input terminal of the energy storage inverter through the AC output terminal of the power distribution equipment.

[0025] In one possible implementation, the system further includes photovoltaic power supply equipment; the energy storage inverter further includes a second AC input terminal;

[0026] The AC output terminal of the photovoltaic power supply equipment is connected to the second AC input terminal of the energy storage inverter.

[0027] In one possible implementation, the power distribution equipment further includes a third relay; the third relay includes an AC input terminal, an AC output terminal, and a control port;

[0028] The controller is connected to the control port of the third relay;

[0029] The AC input terminal of the third relay is connected to the AC output terminal of the photovoltaic power supply equipment through the second AC input terminal of the energy storage inverter.

[0030] The AC output terminal of the third relay is connected to the load through the AC output terminal of the energy storage inverter.

[0031] In one possible implementation, the power distribution equipment further includes a photosensitive switch assembly; the photosensitive switch assembly includes an AC input terminal and an AC output terminal;

[0032] The AC input terminal of the photosensitive switch assembly is connected to the AC output terminal of the photovoltaic power supply equipment;

[0033] The AC output terminal of the photosensitive switch assembly is connected to the second AC input terminal of the energy storage inverter.

[0034] In one possible implementation, the photosensitive switch assembly includes a photoresistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first transistor, a second transistor, and a relay; the relay includes a coil and a normally open switch; the coil includes a first terminal, a second terminal, and a control port; the normally open switch includes a first terminal, a second terminal, and a control port.

[0035] One end of the photoresistor is connected to one end of the first resistor and one end of the second resistor respectively; the other end of the photoresistor is grounded, and the other end of the first resistor is connected to a DC power supply voltage.

[0036] The other end of the second resistor is connected to the base of the first transistor, and the emitter of the first transistor is connected to the DC power supply voltage; the collector of the first transistor is connected in series with the third resistor and then grounded.

[0037] One end of the fourth resistor is connected to the collector of the first transistor, and the other end of the fourth resistor is connected to the base of the second transistor.

[0038] The emitter of the second transistor is grounded, and the collector of the second transistor is connected to the first end of the coil of the relay. The second end of the coil is connected to the DC power supply voltage. The control port of the coil is connected to the control port of the normally open switch. The first end of the normally open switch is connected to the AC output terminal of the photovoltaic power supply equipment, and the second end of the normally open switch is connected to the first AC input terminal of the energy storage inverter.

[0039] In one possible implementation, the DC terminal includes a DC input terminal and a DC output terminal.

[0040] The hybrid power supply control system provided by this utility model includes: power distribution equipment, an energy storage inverter, and an energy storage device. The power distribution equipment includes a first AC input terminal, a second AC input terminal, and an AC output terminal. The energy storage inverter includes a first AC input terminal, a DC terminal, and an AC output terminal. The energy storage device includes a DC terminal. The first AC input terminal of the power distribution equipment is connected to the AC output terminal of the power grid, and the second AC input terminal of the power distribution equipment is connected to the AC output terminal of the diesel generator set, so that the power distribution equipment can realize power control of the mains power and diesel generation. The AC output terminal of the power distribution equipment is connected to the first AC input terminal of the energy storage inverter, and the DC terminal of the energy storage inverter is connected to the DC terminal of the energy storage device. At this time, the power distribution equipment can realize power transmission to the energy storage device through the energy storage inverter and the energy storage device. The AC output terminal of the energy storage inverter is connected to the load to realize power supply to the load. It can be seen that the system can realize rapid switching between diesel generation and mains power, and at the same time, with the use of energy storage device, it can not only provide continuous power to the load in the case of unstable mains power, but also reduce the running time of diesel generator, thereby reducing the noise pollution and pollution emissions of diesel generator. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A schematic diagram of a hybrid power supply control system provided in an embodiment of this utility model;

[0043] Figure 2 A schematic diagram of the connection between an energy storage inverter and an energy storage device provided in an embodiment of this utility model;

[0044] Figure 3 A schematic diagram of the structure of a power distribution device provided in an embodiment of this utility model;

[0045] Figure 4 A schematic diagram of another hybrid power supply control system provided in an embodiment of this utility model;

[0046] Figure 5 This is a schematic diagram of another power distribution device provided in an embodiment of the present utility model;

[0047] Figure 6 A schematic diagram of the structure of a photosensitive switch assembly provided in an embodiment of this utility model;

[0048] Figure 7 This is a schematic diagram of another power distribution device provided in an embodiment of the present utility model. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Unless otherwise defined, the technical or scientific terms used in the present utility model should have the ordinary meaning understood by those skilled in the art to which the present utility model pertains. The words "first," "second," and similar terms used in the present utility model do not indicate any order, quantity, or importance, but are only used to distinguish different components. The words "comprising" or "including," etc., mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, but does not exclude other elements or objects. The words "connection," "coupled," or "linked," etc., are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0050] Figure 1 The present invention provides a hybrid power supply control system, such as Figure 1 As shown, the system is connected to the power grid 100 and the diesel generator set 200. The system may include: an energy storage device 300, a power distribution device 400, and an energy storage inverter 500; wherein, the power distribution device 400 may include a first AC input terminal, a second AC input terminal, and an AC output terminal; the energy storage inverter 500 may include a first AC input terminal, a DC terminal, and an AC output terminal; the energy storage device 300 may include a DC terminal.

[0051] Combination Figure 1The first AC input terminal of the power distribution equipment 400 is connected to the AC output terminal of the power grid 100, and the second AC input terminal of the power distribution equipment 400 is connected to the AC output terminal of the diesel generator set 200.

[0052] The AC output terminal of the power distribution equipment 400 is connected to the first AC input terminal of the energy storage inverter 500;

[0053] The DC terminal of the energy storage inverter 500 is connected to the DC terminal of the energy storage device 300, and the AC output terminal of the energy storage inverter 500 is connected to the load. The DC terminal may include a DC input terminal and a DC output terminal.

[0054] The power distribution equipment 400 is used to receive AC power output from the power grid 100 or the diesel generator set 200, and transmit the received AC power to the energy storage inverter 500.

[0055] The energy storage inverter 500 is used to convert the AC power transmitted by the power distribution equipment 400 into another form of AC power (i.e., AC power after voltage, frequency or phase adjustment according to load demand) to power the load; to convert the DC power output by the energy storage equipment 300 into AC power required by the load to power the load; and to convert the AC power transmitted by the power distribution equipment 400 into DC power and output it to the energy storage equipment 300.

[0056] It should be noted that the diesel generator set output is unstable, but the energy storage inverter 500 can provide a stable AC voltage and frequency.

[0057] Energy storage device 300 is used to store DC power for supplying power to the load, and to store DC power output from the DC terminal of energy storage inverter 500.

[0058] Furthermore, the power distribution equipment 400 may also include a communication interface; the energy storage inverter 500 may also include a first communication interface and a second communication interface; the energy storage equipment 300 may also include a communication interface.

[0059] Combination Figure 1 The communication interface of the power distribution equipment 400 is connected to the first communication interface of the energy storage inverter 500, and the second communication interface of the energy storage inverter 500 is connected to the communication interface of the energy storage equipment 300.

[0060] In other words, the energy storage device 300 and the power distribution device 400 can communicate with each other through the energy storage inverter 500 to transmit the working status information of the energy storage device 300 to the power distribution device 400. The working status information of the energy storage device 300 can include the current remaining power (State of Charge, SOC) to determine whether it is necessary to convert the AC power transmitted by the power distribution device 400 into DC power to charge the energy storage device 300.

[0061] The communication connection method between the energy storage device 300 and the energy storage inverter 500 can be the same as or different from the communication connection method between the power distribution device 400 and the energy storage inverter 500, and can be configured according to actual needs. The communication connection method can include CAN bus connection or serial data interface connection such as RS232 or RS485.

[0062] like Figure 2 As shown, the energy storage inverter 500 may include an AC converter 510, an inverter 520, and a communication module 530; wherein, the AC converter 510 may include an input terminal and an output terminal; the inverter 520 may include a DC terminal and an output terminal; and the communication module 530 may include a first communication interface and a second communication interface.

[0063] The AC converter 510 can be an AC / AC converter to control the voltage, frequency, or phase of the AC power input to the AC converter; the inverter 520 can be a DC / AC converter to convert the DC power input to the inverter into AC power.

[0064] The input terminal of the AC converter 510 is connected to the AC output terminal of the power distribution equipment 400 through the first AC input terminal of the energy storage inverter 500; the output terminal of the AC converter 510 is connected to the load through the AC output terminal of the energy storage inverter 500.

[0065] The DC terminal of inverter 520 is connected to the DC terminal of energy storage device 300 through the DC terminal of energy storage inverter 500; the output terminal of inverter 520 is connected to the load through the AC output terminal of energy storage inverter.

[0066] The first communication interface of the communication module 530 is connected to the first communication interface of the power distribution equipment 400; the second communication interface of the communication module 530 is connected to the communication interface of the energy storage device 300. The communication module 530 is a module that supports the above-mentioned communication connection methods. Communication between the energy storage device 300 and the power distribution equipment 400 can be achieved through the communication module 530 in the energy storage inverter 500.

[0067] In some embodiments, the energy storage inverter 500 may be an energy storage converter (Power Conversion System, PCS).

[0068] Combination Figure 2 As shown, the energy storage device 300 may include a battery management system 310 and a battery pack assembly 320 managed by the battery management system 310, the battery pack assembly 320 may include at least one battery pack.

[0069] The battery management system 310 may include a communication interface; the battery pack assembly 320 may include a DC terminal.

[0070] The communication interface of the battery management system 310 is used as the communication interface of the energy storage device 300 and is connected to the second communication interface of the communication module 530; the DC terminal of the battery pack assembly 320 is connected to the DC terminal of the inverter 520.

[0071] like Figure 3 As shown, the power distribution equipment 400 may include a controller 410, a first relay 420, and a second relay 430 for controlling the switching of the power grid 100 and the diesel generator set 200; wherein, the first relay 420 may include an AC input terminal, an AC output terminal, and a control port; and the second relay 430 may include an AC input terminal, an AC output terminal, and a control port.

[0072] The controller 410 is connected to the control port of the first relay 420 and the control port of the second relay 430;

[0073] The AC input terminal of the first relay 420 is connected to the AC output terminal of the power grid 100 through the first AC input terminal of the power distribution equipment 400;

[0074] The AC input terminal of the second relay 420 is connected to the AC output terminal of the diesel generator set 200 through the second AC input terminal of the power distribution equipment 400.

[0075] The AC output terminals of the first relay 420 and the second relay 430 are connected to the AC input terminal of the energy storage inverter 500 through the AC output terminal of the power distribution equipment 400.

[0076] The controller 410 is used to monitor the working status information of the power grid 100 and the diesel generator set 200 in real time, and based on the working status information, send corresponding switching control commands to the control port of the first relay 420 and the control port of the second relay 430 to control the power grid 100 or the diesel generator set 200 to output AC power.

[0077] If the controller cannot detect the working status information of the power grid when the diesel generator set is fault-free, it will confirm that the power grid is disconnected and control the first relay to open and the second relay to close, so as to control the diesel generator set to output AC power and realize the switching between the power grid and the diesel generator set. The switching time only takes 20ms. This switching method realizes the rapid switching between diesel power generation and the power grid.

[0078] Furthermore, in the event of a grid or diesel generator failure, the energy storage device can quickly provide power to ensure uninterrupted power supply to the load. Specifically: if, during the aforementioned process of the diesel generator set supplying power to the load, the controller cannot detect the operating status information of the diesel generator set and the grid, it confirms that both the grid and the diesel generator set are disconnected. At this time, the controller communicates with the battery management system in the energy storage device through the inverter's communication module, instructing the battery pack components to supply power to the load through the energy storage inverter, thereby achieving a switch between the diesel generator set and the battery pack components. This switchover time is less than 20ms. During the switchover process, the current first decreases and then increases to a stable state. This switchover method improves the reliability of power supply.

[0079] In some embodiments, such as Figure 4 As shown, the system may also include a photovoltaic power supply device 600; the energy storage inverter 500 may also include a second AC input terminal.

[0080] In one scenario, the AC output terminal of the photovoltaic power supply device 600 can be connected to the second AC terminal of the energy storage inverter 500. This allows the energy storage inverter 500 to convert the AC power output from the photovoltaic power supply device 600 into another form of AC power (i.e., AC power regulated by voltage, frequency, or phase according to load requirements), and then supply power to the load through the energy output terminal of the energy storage inverter 500. Alternatively, when the energy storage inverter 500 detects that the current remaining SOC of the battery pack components is less than a preset minimum charge threshold (e.g., 5%), it converts the AC power output from the photovoltaic power supply device 600 into DC power, and then charges the energy storage device 300 through the DC terminal of the energy storage inverter 500. The second AC terminal of the energy storage inverter 500 can be either the first AC terminal or an AC input terminal different from the first AC terminal. Figure 2 The second AC terminal also needs to be connected to the input terminal of the AC converter 510.

[0081] In another scenario, the photovoltaic power supply device 600 can be connected to the power distribution device 400. In this case, as... Figure 5 As shown, the power distribution equipment 400 may also include a photosensitive switch assembly 440; the photosensitive switch assembly 440 may include an AC input terminal and an AC output terminal;

[0082] The AC input terminal of the photosensitive switch assembly 440 is connected to the AC output terminal of the photovoltaic power supply equipment 600; the AC output terminal of the photosensitive switch assembly 440 is connected to the second AC input terminal of the energy storage inverter 500. The photosensitive switch assembly is turned on during the day when there is light and turned off at night when there is no light, so that the photovoltaic power supply equipment provides AC power during the day and does not provide AC power at night.

[0083] like Figure 6As shown, the photosensitive switch assembly may include a photoresistor RL, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first transistor Q1 (PNP type), a second transistor Q2 (NPN type), and a relay K; wherein, the relay K may include a coil and a normally open switch; the coil may include a first terminal, a second terminal, and a control port; the normally open switch may include a first terminal, a second terminal, and a control port.

[0084] One end of the photoresistor RL is connected to one end of the first resistor R1 and one end of the second resistor R2; the other end of the photoresistor RL is grounded, and the other end of the first resistor R1 is connected to the DC power supply voltage.

[0085] The other end of the second resistor R2 is connected to the base b of the first transistor Q1, and the emitter e of the first transistor Q1 is connected to the DC power supply voltage; the collector c of the first transistor Q1 is connected in series with the third resistor R3 and then grounded.

[0086] One end of the fourth resistor R4 is connected to the collector c of the first transistor Q1, and the other end of the fourth resistor R4 is connected to the base b of the second transistor Q2.

[0087] The emitter e of the second transistor Q2 is grounded, and the collector c of the second transistor Q2 is connected to the first end of the coil of the relay K. The second end of the coil is connected to the DC power supply voltage. The control port of the coil is connected to the control port of the normally open switch. The first end of the normally open switch is connected to the AC output terminal of the photovoltaic power supply equipment, and the second end of the normally open switch is connected to the first AC input terminal of the energy storage inverter.

[0088] The photoresistor RL is connected in series with the first resistor R1. When there is no light, the resistance of the photoresistor RL is relatively large, and the voltage across the photoresistor RL is greater than the voltage across the first resistor R1, causing the voltage across R1 to fall below the turn-on voltage of the first transistor Q1. When there is light, the resistance of the photoresistor RL drops rapidly, and the voltage across R1 rises. When the voltage across R1 reaches the turn-on voltage of the first transistor Q1, the first transistor Q1 conducts, the third resistor R3 conducts, and since the voltage across the third resistor R3 is not less than the turn-on voltage of the second transistor Q2, the second transistor Q2 conducts, the normally open terminal controlled by the relay coil closes, and the photosensitive switch assembly closes.

[0089] Alternatively, the photosensitive switch assembly 440 can be replaced with a third relay 440; the third relay 440 may include an AC input terminal, an AC output terminal, and a control port.

[0090] like Figure 7 As shown, the controller 410 in the power distribution equipment 400 is connected to the control port of the third relay 440;

[0091] The AC input terminal of the third relay 440 is connected to the AC output terminal of the photovoltaic power supply equipment 600 through the second AC input terminal of the energy storage inverter 500.

[0092] The AC output terminal of the third relay 440 is connected to the load through the AC output terminal of the energy storage inverter 500.

[0093] In other words, the aforementioned controller 410 is used to send switching control commands to the control ports of the first relay, the second relay, and the third relay based on the monitored operating status information of the power grid and the diesel generator, so as to control at least one of the power grid, the diesel generator set, and the photovoltaic power supply equipment to output AC power. For example, when the power grid is connected to the energy storage inverter to supply power to the load, if the mains power of the power grid is disconnected and both the diesel generator set and the photovoltaic power supply equipment are fault-free, the controller controls the first relay to open, disconnecting the power grid from the energy storage inverter, and controls the second relay to close, connecting the diesel generator set to the energy storage inverter, thereby enabling the diesel generator set to output AC power; or, it controls the first relay to open, disconnecting the power grid from the energy storage inverter, and controls both the second and third relays to close, connecting both the diesel generator set and the photovoltaic power supply equipment to the energy storage inverter, thereby enabling the diesel generator set and the photovoltaic power supply equipment to jointly output AC power.

[0094] In some embodiments, the controller may be a programmable logic controller or a synchronous controller.

[0095] When the controller is a synchronous controller, if a power grid outage is detected and the operating status information of the diesel generator set is detected, the synchronous controller sends a disconnection switching control command to the control port of the first relay and a conduction switching control command to the control port of the second relay when the operating status information of the diesel generator set is the same as the operating status information before the power grid outage; wherein, the operating status information may include output voltage, phase and frequency.

[0096] When the operating status information of the diesel generator set differs from that before the power grid outage, a control command is sent to the diesel generator set to adjust the excitation system and speed governor of the diesel generator set to match the operating status information before the power grid outage. Then, a disconnection switching control command is sent to the control port of the first relay, and a conduction switching control command is sent to the control port of the second relay.

[0097] The hybrid power supply control system provided by this utility model allows each device component to operate independently, enabling individual debugging and replacement if problems arise. It prioritizes mains power output at its input, switching to diesel generator mode, photovoltaic mode, and / or battery pack mode to power the load when mains power is insufficient.

[0098] For energy storage devices, the battery pack capacity can be increased or decreased according to load demand; for devices with excessive power consumption, battery packs can be stacked to expand capacity. In the event of a failure in both mains power and the diesel generator, energy storage devices can rapidly provide power to ensure uninterrupted power supply to the load. Energy storage inverters can provide stable voltage and frequency, reducing power quality-related issues.

[0099] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0100] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this utility model without departing from the spirit and scope of the embodiments of this utility model. Therefore, if these modifications and variations to the embodiments of this utility model fall within the scope of the claims in this utility model and their equivalents, then this utility model also intends to include these modifications and variations.

Claims

1. A hybrid power supply control system, characterized in that, The system includes: power distribution equipment, an energy storage inverter, and an energy storage device; the power distribution equipment includes a first AC input terminal, a second AC input terminal, and an AC output terminal; the energy storage inverter includes a first AC input terminal, a DC terminal, and an AC output terminal; the energy storage device includes a DC terminal. The first AC input terminal of the power distribution equipment is connected to the AC output terminal of the power grid, and the second AC input terminal of the power distribution equipment is connected to the AC output terminal of the diesel generator set. The AC output terminal of the power distribution equipment is connected to the first AC input terminal of the energy storage inverter. The DC terminal of the energy storage inverter is connected to the DC terminal of the energy storage device, and the AC output terminal of the energy storage inverter is connected to the load.

2. The system as described in claim 1, characterized in that, The power distribution equipment also includes a communication interface; the energy storage inverter also includes a first communication interface and a second communication interface; the energy storage equipment also includes a communication interface; The communication interface of the power distribution equipment is connected to the first communication interface of the energy storage inverter, and the second communication interface of the energy storage inverter is connected to the communication interface of the energy storage equipment.

3. The system as described in claim 2, characterized in that, The energy storage inverter includes an AC converter and an inverter; the AC converter includes an input terminal and an output terminal; the inverter includes a DC terminal and an output terminal. The input terminal of the AC converter is connected to the AC output terminal of the power distribution equipment through the first AC input terminal of the energy storage inverter; the output terminal of the AC converter is connected to the load through the AC output terminal of the energy storage inverter. The DC terminal of the inverter is connected to the DC terminal of the energy storage device through the DC terminal of the energy storage inverter; the output terminal of the inverter is connected to the load through the AC output terminal of the energy storage inverter.

4. The system as described in claim 3, characterized in that, The energy storage inverter also includes a communication module, which includes a first communication interface and a second communication interface. The first communication interface of the communication module is connected to the first communication interface of the power distribution equipment. The second communication interface of the communication module is connected to the communication interface of the energy storage device.

5. The system as described in claim 4, characterized in that, The energy storage device includes a battery management system and a battery pack assembly; the battery management system includes a communication interface; the battery pack assembly includes a DC terminal; The communication interface of the battery management system serves as the communication interface of the energy storage device and is connected to the second communication interface of the communication module. The DC terminal of the battery pack assembly is connected to the DC terminal of the inverter.

6. The system as described in claim 1, characterized in that, The power distribution equipment includes a controller, a first relay, and a second relay; the first relay includes an AC input terminal, an AC output terminal, and a control port; the second relay includes an AC input terminal, an AC output terminal, and a control port. The controller is connected to the control port of the first relay and the control port of the second relay; The AC input terminal of the first relay is connected to the AC output terminal of the power grid through the first AC input terminal of the power distribution equipment; The AC input terminal of the second relay is connected to the AC output terminal of the diesel generator set through the second AC input terminal of the power distribution equipment; The AC output terminals of the first relay and the second relay are connected to the AC input terminal of the energy storage inverter through the AC output terminal of the power distribution equipment.

7. The system as described in claim 6, characterized in that, The system also includes photovoltaic power supply equipment; the energy storage inverter also includes a second AC input terminal; The AC output terminal of the photovoltaic power supply equipment is connected to the second AC input terminal of the energy storage inverter.

8. The system as described in claim 7, characterized in that, The power distribution equipment also includes a third relay; the third relay includes an AC input terminal, an AC output terminal, and a control port; The controller is connected to the control port of the third relay; The AC input terminal of the third relay is connected to the AC output terminal of the photovoltaic power supply equipment through the second AC input terminal of the energy storage inverter. The AC output terminal of the third relay is connected to the load through the AC output terminal of the energy storage inverter.

9. The system as described in claim 7, characterized in that, The power distribution equipment also includes a photosensitive switch assembly; the photosensitive switch assembly includes an AC input terminal and an AC output terminal; The AC input terminal of the photosensitive switch assembly is connected to the AC output terminal of the photovoltaic power supply equipment; The AC output terminal of the photosensitive switch assembly is connected to the second AC input terminal of the energy storage inverter.

10. The system as described in claim 9, characterized in that, The photosensitive switch assembly includes a photoresistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first transistor, a second transistor, and a relay; the relay includes a coil and a normally open switch; the coil includes a first terminal, a second terminal, and a control port; the normally open switch includes a first terminal, a second terminal, and a control port. One end of the photoresistor is connected to one end of the first resistor and one end of the second resistor respectively; the other end of the photoresistor is grounded, and the other end of the first resistor is connected to a DC power supply voltage. The other end of the second resistor is connected to the base of the first transistor, and the emitter of the first transistor is connected to the DC power supply voltage; the collector of the first transistor is connected in series with the third resistor and then grounded. One end of the fourth resistor is connected to the collector of the first transistor, and the other end of the fourth resistor is connected to the base of the second transistor. The emitter of the second transistor is grounded, and the collector of the second transistor is connected to the first end of the coil of the relay. The second end of the coil is connected to the DC power supply voltage. The control port of the coil is connected to the control port of the normally open switch. The first end of the normally open switch is connected to the AC output terminal of the photovoltaic power supply equipment, and the second end of the normally open switch is connected to the first AC input terminal of the energy storage inverter.

11. The system according to any one of claims 1-10, characterized in that, The DC terminal includes a DC input terminal and a DC output terminal.

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