DC bus charging control circuit and energy storage system

Abstract

The utility model provides a DC bus charging control circuit and an energy storage system, comprising a master control system, a switch power supply board used for supplying power to the master control system, a rectifier bridge arranged on the switch power supply board, and a switch control circuit connected between the rectifier bridge and a DC bus, the control end of the switch control circuit is connected with the master control system and used for controlling whether the electric signals output by the rectifier bridge are output to the direct current bus or not through on-off of the switch control circuit. The DC bus charging control circuit provided by the utility model solves the technical problems of high production cost and large equipment size caused by the fact that an optical storage all-in-one machine comprises two rectifier bridge devices in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of DC bus charging, in particular to a DC bus charging control circuit and an energy storage system. Background Art

[0002] The photovoltaic energy storage integrated energy conversion device (abbreviated as photovoltaic storage integrated device) is a device used in photovoltaic and energy storage combined power generation systems to realize DC / AC power conversion. It adopts power electronic control technology to coordinate the output of photovoltaic and energy storage batteries, smooth out the power fluctuations of photovoltaic batteries, and output AC power that meets standard requirements to supply power to the load through energy storage conversion technology.

[0003] During grid-connected startup, a PV-storage system requires a rectifier bridge to charge the DC bus capacitor. Once the DC bus voltage stabilizes and the system resumes normal operation, the rectifier bridge ceases operation. During this process, the rectifier bridge draws power from the AC grid, rectifies the AC into DC, and supplies it to the DC bus. This electronic component is essential.

[0004] The power supply voltage of the DC 24V power supply board in the photovoltaic and storage integrated machine is also converted from the 220V AC power grid. The front half of the power board also has a rectifier bridge component, so the entire photovoltaic and storage integrated machine system contains two rectifier bridge devices, which not only increases the production cost of the photovoltaic and storage integrated machine, but also increases the volume of the product to a certain extent.

[0005] Therefore, the prior art needs to be further developed. Utility Model Content

[0006] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and provide a DC bus charging control circuit and energy storage system to solve the technical problems in the related art that the photovoltaic storage integrated machine contains two rectifier bridge devices, resulting in high production costs and large equipment size.

[0007] To achieve the above technical objectives, the present invention adopts the following technical solutions: Provided is a DC bus charging control circuit, comprising a main control system, a switching power supply board for powering the main control system, and a rectifier bridge disposed on the switching power supply board, characterized in that it also includes:

[0008] The switch control circuit is connected between the rectifier bridge and the DC bus. The control end of the switch control circuit is connected to the main control system and is used to control whether the electrical signal output by the rectifier bridge is output to the DC bus by its own on and off control.

[0009] Furthermore, the switch control circuit includes a control switch, and the control switch is a combination of one or more of the following items, including:

[0010] contactors, relays or transistors.

[0011] An energy storage system, comprising:

[0012] A main control system, a switching power supply board for supplying power to the main control system, a rectifier bridge arranged on the switching power supply board, and,

[0013] The above-mentioned DC bus charging control circuit.

[0014] Furthermore, it also includes:

[0015] The DC / AC module is connected to the input side of the AC grid and is used to convert the DC voltage on the DC bus into the supply voltage of the AC grid.

[0016] Furthermore, the switching power supply board has an input end connected between the DC / AC module and the AC power grid, and is used to draw power from the AC power grid; its first output end is connected to the main control system, and is used to power the main control system; its second output end is connected to the DC bus through the switch control circuit of the DC bus charging control circuit.

[0017] Furthermore, it also includes:

[0018] Voltage detection module, used to detect the voltage on the DC bus;

[0019] The main control system is also connected to the voltage detection module.

[0020] Furthermore, the power supply system of the energy storage system includes:

[0021] A photovoltaic cell array, and a photovoltaic DC / DC module connected to an output end of the photovoltaic cell array;

[0022] and / or,

[0023] An energy storage battery system and an energy storage DC / DC module connected to the output end of the energy storage battery system.

[0024] Furthermore, the power supply system of the energy storage system includes:

[0025] A photovoltaic cell array and a photovoltaic inverter connected to the output end of the photovoltaic cell array.

[0026] Furthermore, the power supply system of the energy storage system includes:

[0027] An energy storage battery system and an energy storage inverter connected to the output end of the energy storage battery system.

[0028] Furthermore, the power supply system is connected to the DC / AC module via a DC bus.

[0029] Beneficial effects:

[0030] 1. By setting up a switch control circuit, the access of the rectifier bridge to the DC bus can be controlled to realize the control of the DC bus charging process. By reusing the rectifier bridge set on the switching power supply board, while realizing the charging control of the DC bus, the use of one rectifier bridge component can be reduced, thereby achieving a certain degree of optimization in the production cost and equipment volume of the equipment, and solving the technical problem in the related art that the photovoltaic storage integrated machine contains two rectifier bridge devices, resulting in high production costs and large equipment volume.

[0031] 2. The energy storage system in this embodiment can remove the main power circuit rectifier bridge located on the DC / AC main power circuit, and use the rectifier bridge on the switching power supply board to charge the DC bus, thereby realizing the reuse of the rectifier bridge on the switching power supply board, and controlling the access of the rectifier bridge on the switching power supply board to the DC bus through the main control system. During the startup process of the photovoltaic and storage integrated system, the original DC bus charging effect can be achieved while reducing one rectifier bridge device, thereby reducing the production cost of the entire photovoltaic and storage integrated system and also reducing the volume of the photovoltaic and storage integrated system.

[0032] 3. By setting a control switch, the output end of the rectifier bridge is connected to the DC bus through the control switch, and by controlling the closing or opening of the control switch, the control switch control circuit is automatically closed or opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural diagram of a DC bus charging control circuit used in the prior art;

[0034] Figure 2 This is a schematic diagram of the structure of the DC bus charging control circuit used in the embodiment of the present utility model;

[0035] Figure 3 It is a flow chart of a charging method of a DC bus charging control circuit adopted in an embodiment of the present utility model.

[0036] The above drawings include the following reference numerals:

[0037] 10. Main power circuit rectifier bridge;

[0038] 1. DC bus; 2. Rectifier bridge; 3. AC grid; 4. Switch control circuit; 41. Control switch; 5. Main control system; 6. Switching power supply board; 7. DCAC module. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0040] As described in the background technology, in the conventional integrated solar storage system, there is a rectifier bridge on the 24V switching power supply board and the DCAC main power circuit respectively. Figure 1 A rectifier bridge 2 is installed in the switching power supply board 6, and a main power circuit rectifier bridge 10 is installed in the DCAC main power circuit. During the grid-connected startup process of the integrated photovoltaic and storage system, the main power circuit rectifier bridge 10 is required to charge the capacitors of the DC bus 1. After the DC bus 1 voltage stabilizes, the system resumes normal operation, at which point the main power circuit rectifier bridge 10 stops operating. During this process, the main power circuit rectifier bridge 10 draws power from the AC grid 3, rectifies the AC power into DC power, and sends it to the DC bus 1.

[0041] Therefore, the main power circuit rectifier bridge 10 is placed between the DCAC module 7 and the AC power grid 3, and the rectifier bridge 2 in the switching power supply board 6 in the integrated optical storage system is also directly connected to the AC power grid 3. The specifications and models of the two rectifier bridges are consistent. From the perspective of the entire equipment, this not only increases the production cost of the product, but also increases the volume of the product to a certain extent.

[0042] Example 1

[0043] According to an embodiment of the present invention, a DC bus charging control circuit is provided. Figures 1 to 3 , including a main control system 5, a switching power supply board 6 for supplying power to the main control system 5, and a rectifier bridge 2 arranged on the switching power supply board 6, and also including:

[0044] The switch control circuit 4 is connected between the rectifier bridge 2 and the DC bus 1. The control end of the switch control circuit 4 is connected to the main control system 5, and is used to control whether the electrical signal output by the rectifier bridge 2 is output to the DC bus 1 by its own on and off control.

[0045] Specifically, the switch control circuit 4 is used to close when it receives the switch control signal output by the main control system 5, so as to control the rectifier bridge 2 to output the electrical signal output by the rectifier bridge 2 to the DC bus 1, and convert the AC voltage connected to the AC power grid 3 into a DC voltage and output it to the DC bus 1 to charge the DC bus 1; the switch control circuit 4 is disconnected when it receives the switch end control signal output by the main control system 5, so as to disconnect the electrical connection between the rectifier bridge 2 and the DC bus 1. When the DC bus 1 meets certain technical conditions, the switch control circuit 4 can be controlled to disconnect in time, thereby ending the charging process of the DC bus 1.

[0046] Specifically, the main control system 5 is electrically connected to the switch control circuit 4 and the DC bus 1, and is configured to output a switch control signal or a switch end control signal to the switch control circuit 4 to control the closing or opening of the switch control circuit 4. Through the above arrangement, the main control system 5 controls the connection between the rectifier bridge 2 and the DC bus 1, thereby controlling the DC bus charging process.

[0047] It can be understood that by setting up a switch control circuit 4, the access of the rectifier bridge 2 to the DC bus 1 can be controlled to realize the control of the charging process of the DC bus 1. By reusing the rectifier bridge 2 set on the switching power supply board 6, while realizing the charging control of the DC bus 1, the use of one rectifier bridge component can be reduced, thereby achieving a certain degree of optimization in the production cost and equipment volume of the equipment, and solving the technical problem in the related technology that the optical storage integrated machine contains two rectifier bridge devices, resulting in high production cost and large equipment volume.

[0048] In the DC bus charging control circuit of this embodiment, see Figure 2 The switch control circuit 4 includes a control switch 41. The control switch 41 is a combination of one or more of the following items, including:

[0049] contactors, relays or transistors.

[0050] In some embodiments, the control switch 41 is provided in series between the DC bus 1 and the rectifier bridge 2. Thus, the output end of the rectifier bridge 2 is connected to the DC bus 1 via the control switch 41, and the control switch control circuit 4 is automatically closed or opened by controlling the closing or opening of the control switch 41.

[0051] Specifically, the control switch 41 in the solution can be a switching conversion device such as a contactor, a relay, a transistor, etc., which has high versatility.

[0052] Example 2

[0053] In the energy storage system of this embodiment, see Figure 2 ,include:

[0054] A main control system 5, a switching power supply board 6 for supplying power to the main control system 5, a rectifier bridge 2 provided on the switching power supply board 6, and,

[0055] The above-mentioned DC bus charging control circuit.

[0056] By adopting the above-mentioned DC bus charging control circuit in the energy storage system, the access of the rectifier bridge 2 to the DC bus 1 can be controlled to realize the control of the charging process of the DC bus 1. While the switching power supply board 6 supplies power to the main control system 5, the rectifier bridge 2 set on the switching power supply board 6 can be selectively connected to the DC bus 1, thereby realizing the reuse of the rectifier bridge 2 set on the switching power supply board 6, which can reduce the use of one rectifier bridge component, thereby achieving a certain degree of optimization in the production cost and equipment volume of the equipment, and solving the technical problem in the related art that the photovoltaic storage integrated machine contains two rectifier bridge devices, resulting in high production cost and large equipment volume.

[0057] It should be noted that the energy storage system includes but is not limited to integrated photovoltaic and storage systems, photovoltaic inverters, energy storage PCS and other energy storage systems.

[0058] Specifically, the energy storage system in this embodiment is applied to the photovoltaic and energy storage integrated system. The main power circuit rectifier bridge 10 located on the DC / AC main power circuit can be removed, and the rectifier bridge 2 on the switching power supply board 6 can be used to charge the DC bus 1, thereby realizing the reuse of the rectifier bridge 2 on the switching power supply board 6, and the access of the rectifier bridge 2 on the switching power supply board 6 to the DC bus 1 is controlled by the main control system 5. During the startup process of the photovoltaic and energy storage integrated system, the original DC bus charging effect can be achieved while reducing one rectifier bridge device, thereby reducing the production cost of the entire photovoltaic and energy storage integrated system, and also reducing the volume of the photovoltaic and energy storage integrated system.

[0059] In the energy storage system of this embodiment, see Figure 2 , also includes:

[0060] The DC / AC module 7 is connected to the input side of the AC grid 3 and is used to convert the DC voltage on the DC bus 1 into a supply voltage for the AC grid 3 .

[0061] It is understandable that by providing the DC / AC module 7 , the DC voltage in the energy storage system is converted into AC voltage, thereby achieving the conversion of electric energy, so that the electric energy output by the energy storage system can be directly used.

[0062] In the energy storage system of this embodiment, see Figure 2 ,

[0063] The switching power supply board 6 has an input end connected between the DC / AC module 7 and the AC power grid 3, and is used to draw power from the AC power grid 3; its first output end is connected to the main control system 5, and is used to supply power to the main control system 5; its second output end is connected to the DC bus 1 through the switch control circuit 4 of the DC bus charging control circuit.

[0064] It should be noted that the input end of the switching power board 6 is connected between the DC / AC module 7 and the AC grid 3 , and is used to draw power from the AC grid 3 , so that the switching power board 6 is powered, thereby supplying power to the main control system 5 .

[0065] It should be noted that when the control switch 41 is closed to charge the rectifier bridge 2 to charge the DC bus 1, its first output end is connected to the main control system 5, and the switching power supply board 6 synchronously supplies power to the main control system 5 to maintain normal operation of the system.

[0066] It can be understood that the first output end of the switching power supply board 6 is connected to the main control system 5, and the second output end of the switching power supply board 6 is connected to the DC bus 1 through the switching control circuit 4 of the DC bus charging control circuit, thereby realizing the reuse of the rectifier bridge 2 on the switching power supply board 6.

[0067] By applying the energy storage system in this embodiment to the integrated photovoltaic and energy storage system, the main power circuit rectifier bridge 10 located on the DC / AC main power circuit can be eliminated. While completing the power supply function, the switching power supply board 6 where the rectifier bridge 2 is located can selectively connect the rectifier bridge 2 to the DC bus 1. The rectifier bridge 2 on the switching power supply board 6 is used to charge the DC bus 1, thereby realizing the reuse of the rectifier bridge 2 on the switching power supply board 6, thereby achieving that one rectifier bridge component can meet the functional requirements of the entire integrated photovoltaic and energy storage system.

[0068] In the energy storage system of this embodiment, see Figure 2 , also includes:

[0069] A voltage detection module is used to detect the voltage on the DC bus 1;

[0070] The main control system 5 is also connected to the voltage detection module.

[0071] It can be understood that the voltage detection module is used to detect the voltage on the DC bus 1. The main control system 5 outputs a switch control signal or a switch end control signal to the switch control circuit 4 based on the measured voltage of the DC bus 1 to realize the control of the charging process of the DC bus 1.

[0072] In some embodiments, when the DC bus 1 voltage is less than the first voltage, the main control system 5 outputs a switch control signal and the switch control circuit 4 is closed; when the DC bus 1 voltage is greater than or equal to the first voltage, the main control system 5 outputs a switch end control signal and the switch control circuit 4 is disconnected.

[0073] Specifically, when the voltage of the DC bus 1 is less than the first voltage, the voltage value of the DC bus 1 is less than the rated value, the main control system 5 issues a charging instruction, the main control system 5 outputs a switch control signal, the switch control circuit 4 is closed, that is, the control switch 41 is closed, the rectifier bridge 2 is connected to the DC bus 1, and the DC bus 1 is charged;

[0074] When the voltage of the DC bus 1 is greater than or equal to the first voltage, the voltage value of the DC bus 1 reaches the rated value, and there is no need to charge the DC bus 1. The main control system 5 outputs a switch end control signal, and the switch control circuit 4 is disconnected, that is, the control switch 41 is disconnected, and the rectifier bridge 2 is disconnected from the DC bus 1, and the DC bus 1 is no longer charged.

[0075] In the energy storage system of this embodiment, see Figure 2 , the power supply system of the energy storage system includes:

[0076] A photovoltaic cell array, and a photovoltaic DC / DC module connected to an output end of the photovoltaic cell array;

[0077] and / or,

[0078] An energy storage battery system and an energy storage DC / DC module connected to the output end of the energy storage battery system.

[0079] It should be noted that the photovoltaic cell array is connected to the DC bus 1 through a photovoltaic DC / DC converter, and the photovoltaic DC / DC converter realizes a bidirectional flow of electric energy, and can transmit the electric energy of the photovoltaic cell array to the load or the energy storage battery system.

[0080] It should be noted that the energy storage battery system is connected to the DC bus 1 through the energy storage DC / DC converter. When the energy storage battery system needs to supply power to the AC grid, the energy storage DC / DC converter converts the output voltage of the energy storage battery system into a voltage suitable for the DC bus 1.

[0081] In the energy storage system of this embodiment, see Figure 2 , the power supply system of the energy storage system includes:

[0082] A photovoltaic cell array and a photovoltaic inverter connected to the output end of the photovoltaic cell array.

[0083] It should be noted that the photovoltaic cell array is connected to the DC bus 1 through a photovoltaic inverter, and the photovoltaic inverter realizes a bidirectional flow of electric energy, and the electric energy of the photovoltaic cell array can be transmitted to the load or the energy storage battery system.

[0084] In the energy storage system of this embodiment, see Figure 2 , the power supply system of the energy storage system includes:

[0085] An energy storage battery system and an energy storage inverter connected to the output end of the energy storage battery system.

[0086] In the energy storage system of this embodiment, see Figure 2 , the power supply system is connected to the DC / AC module 7 through the DC bus 1.

[0087] It should be noted that the energy storage battery system is connected to the DC bus 1 through the energy storage inverter. When the energy storage battery system needs to supply power to the AC grid, the energy storage inverter converts the output voltage of the energy storage battery system into a voltage suitable for the DC bus 1.

[0088] It is understandable that by arranging the DCAC module 7 between the AC grid 3 and the DC bus 1 and isolating the DC bus 1 from the AC system, the DC bus 1 can be prevented from being directly connected to the AC grid 3, so that the AC power does not affect the DC power.

[0089] In some embodiments, see Figure 3 , the charging method of the DC bus charging control circuit of this embodiment is:

[0090] 1. When the photovoltaic storage system is connected to the grid and started, the switch power board 6 is powered first and supplies power to the main control system 5. After the main control system 5 operates normally, the voltage detection module samples the DC bus voltage value.

[0091] 2. If the DC bus voltage is greater than or equal to the first voltage, there is no need to charge the DC bus 1. At this time, the control switch 41 connected to the main control system 5 is disconnected, and the rectifier bridge 2 does not work.

[0092] 3. If the DC bus voltage value is less than the first voltage, the main control system 5 issues a charging instruction to control the switch 41 to close the rectifier bridge 2 to charge the DC bus 1.

[0093] 4. During the charging process, the DC bus voltage value will be continuously monitored. When the DC bus voltage rises to the first voltage, the main control system 5 will issue a stop charging instruction, and the control switch 41 will be disconnected. The charging process ends and the system operates normally.

[0094] The following combination Figure 2 and Figure 3 Introducing an optional embodiment of the present invention:

[0095] During the grid-connected startup process of the integrated photovoltaic and storage system, the main power circuit rectifier bridge 10 is required to charge the DC bus capacitor. After the DC bus 1 voltage stabilizes, the system operates normally, and at this time, the main power circuit rectifier bridge 10 stops working. In this process, the main power circuit rectifier bridge 10 draws power from the AC grid side, rectifies the AC power into DC power, and sends it to the DC bus 1. In previous integrated photovoltaic and storage systems, the main power circuit rectifier bridge 10 was placed between the DCAC module 7 and the AC grid 3, and the rectifier bridge 2 of the 24V switching power board in the integrated photovoltaic and storage system was also directly connected to the AC grid 3. The specifications and models of the two rectifier bridges are the same, so the DC bus charging control circuit in this embodiment removes the original main power circuit rectifier bridge 10 and uses the rectifier bridge 2 on the 24V switching power board to charge the DC bus 1.

[0096] The specific implementation method is as follows: first, remove the original main power circuit rectifier bridge 10 and its related components of the system, and connect the output end of the rectifier bridge 2 in the switch power supply board 6 to the DC bus 1 through the control switch 41. When the photovoltaic storage integrated system is connected to the grid and started, the switch power supply board 6 is first powered and supplies power to the main control system 5. After the main control system 5 operates normally, the DC bus voltage value will be sampled through the voltage detection module. If the bus voltage is greater than or equal to the rated value, there is no need to charge the DC bus 1. At this time, the control switch 41 connected to the main control system is disconnected, and the rectifier bridge 2 does not work. If the bus voltage value is less than the rated value, the main control system 5 issues a charging instruction, and the control switch 41 closes the rectifier bridge 2 to charge the DC bus 1. During the charging process, the DC bus 1 voltage value will be continuously monitored. After the bus voltage rises to the rated value, the main control system 5 issues a stop charging instruction, the control switch 41 is disconnected, the charging process ends, and the system operates normally.

[0097] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0098] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0099] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0100] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0101] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A DC bus charging control circuit, comprising a main control system (5), a switching power supply board (6) for supplying power to the main control system (5), and a rectifier bridge (2) arranged on the switching power supply board (6), characterized in that: Also includes: A switch control circuit (4) is connected between the rectifier bridge (2) and the DC bus (1), wherein a control end of the switch control circuit (4) is connected to the main control system (5) and is used to control whether the electrical signal output by the rectifier bridge (2) is output to the DC bus (1) by turning the switch control circuit (4) on and off.

2. The DC bus charging control circuit according to claim 1, characterized in that: The switch control circuit (4) includes a control switch (41), and the control switch (41) is a combination of one or more of the following items, including: contactors, relays or transistors.

3. An energy storage system, characterized in that: include: A main control system (5), a switching power supply board (6) for supplying power to the main control system (5), a rectifier bridge (2) arranged on the switching power supply board (6), and, The DC bus charging control circuit according to claim 1 or 2.

4. The energy storage system according to claim 3, characterized in that Also includes: The DC / AC module (7) is connected to the input side of the AC power grid (3) and is used to convert the DC voltage on the DC bus (1) into a supply voltage for the AC power grid (3).

5. The energy storage system according to claim 4, characterized in that: The switching power supply board (6) has an input end connected between the DC / AC module (7) and the AC power grid (3) for drawing power from the AC power grid (3); a first output end connected to the main control system (5) for supplying power to the main control system (5); and a second output end connected to the DC bus (1) via a switch control circuit (4) of the DC bus charging control circuit.

6. The energy storage system according to claim 5, characterized in that: Also includes: A voltage detection module, used for detecting the voltage on the DC bus (1); The main control system (5) is also connected to the voltage detection module.

7. The energy storage system according to claim 4, characterized in that: The power supply system of the energy storage system includes: A photovoltaic cell array, and a photovoltaic DC / DC module connected to an output end of the photovoltaic cell array; and / or, An energy storage battery system and an energy storage DC / DC module connected to the output end of the energy storage battery system.

8. The energy storage system according to claim 4, characterized in that: The power supply system of the energy storage system includes: A photovoltaic cell array and a photovoltaic inverter connected to the output end of the photovoltaic cell array.

9. The energy storage system according to claim 4, characterized in that: The power supply system of the energy storage system includes: An energy storage battery system and an energy storage inverter connected to the output end of the energy storage battery system.

10. The energy storage system according to any one of claims 7 to 9, characterized in that: The power supply system is connected to the DC / AC module (7) via a DC bus (1).

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