CN116470558B - Energy storage system - Google Patents
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- CN116470558B CN116470558B CN202310564873.4A CN202310564873A CN116470558B CN 116470558 B CN116470558 B CN 116470558B CN 202310564873 A CN202310564873 A CN 202310564873A CN 116470558 B CN116470558 B CN 116470558B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 78
- 229910006123 SOCa Inorganic materials 0.000 claims description 3
- 241001672018 Cercomela melanura Species 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
Abstract
The utility model provides an energy storage system relates to energy storage technical field, this energy storage system, including energy storage module, supplementary frequency modulation module and controller, wherein, energy storage module contains multi-level converter unit, a plurality of battery cluster and battery management unit, supplementary frequency modulation module contains a plurality of DC/DC converters and a plurality of DC/AC converter, battery management unit is under the condition that detects any battery cluster and appears battery trouble, based on the controller control in the multi-level converter unit single-phase three-level topological unit disconnection that any battery cluster corresponds. The energy storage module can respond to the requirements of primary frequency modulation of different thermal power units on the basis of participating in peak regulation service of the power system, can be flexible and cooperatively optimally controlled, and can assist the thermal power units to finish electric market auxiliary services such as frequency modulation, black start and the like on the basis of guaranteeing normal operation of the independent energy storage power stations.
Description
Technical Field
The present disclosure relates to the field of energy storage technologies, and in particular, to an energy storage system.
Background
Energy storage is an important technology and infrastructure to support new power systems. With the continuous increase of the installed capacity of new energy, newly-built energy storage projects often require energy storage power stations to simultaneously meet the peak shaving and frequency modulation requirements of the power grid and the safe and stable operation requirements of the power grid. The thermal power plant usually comprises thermal power units with different capacities built in different periods, and the voltage levels of the respective station power buses are often different. The capacity of the energy storage system required by frequency modulation and the capacity of the energy storage system required by peak shaving are also greatly different.
Disclosure of Invention
The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.
An embodiment of a first aspect of the present disclosure provides an energy storage system comprising an energy storage module, an auxiliary frequency modulation module, and a controller,
the energy storage module comprises a multi-level converter unit, a plurality of battery clusters and a battery management unit, the auxiliary frequency modulation module comprises a plurality of DC/DC converters and a plurality of DC/AC converters, and the battery management unit controls the single-phase three-level topological unit corresponding to any battery cluster in the multi-level converter unit to be disconnected based on the controller under the condition that any battery cluster is detected to have battery faults.
Optionally, the ac output side of the energy storage module is connected with a 35kV busbar of the energy storage power station, and the 35kV busbar of the energy storage power station is connected to a 220kV power grid through a main transformer of the energy storage power station.
Optionally, the multilevel converter unit is connected with the energy storage direct current bus through a precharge circuit,
the input sides of the plurality of DC/DC converters are connected in series to the energy storing direct current bus,
the output sides of the plurality of DC/DC converters are connected in parallel to the plurality of DC/AC converters,
the plurality of DC/AC converters are converged into a 6kV station service bus or a 10kV station service bus through a transformer.
Optionally, the multi-level converter unit comprises a plurality of single-phase three-level topological units, each single-phase three-level topological unit comprises three half-bridge modules, a direct current port and an alternating current side contactor switch,
the direct current port is connected with auxiliary equipment, and the auxiliary equipment at least comprises the battery cluster and a contactor.
Optionally, each battery cluster includes a first battery cluster and a second battery cluster, and a midpoint of the first battery cluster and a midpoint of the second battery cluster are connected with a midpoint of a dc capacitor corresponding to the dc port.
Optionally, the battery management unit is further configured to: under the condition that the battery cluster is detected to have a battery fault, a fault alarm signal is sent to the controller;
and under the condition that the fault alarm signal is received, the controller controls the single-phase three-level topological unit corresponding to the battery cluster to output zero level.
Optionally, the multilevel converter unit is configured to generate a first output power instruction and superimpose a power instruction required for frequency modulation after receiving the frequency modulation instruction, where the auxiliary frequency modulation module includes a 6kV auxiliary frequency modulation sub-module and a 10kV auxiliary frequency modulation sub-module, and the power instruction required for frequency modulation includes a second output power instruction and a third output power instruction corresponding to the 6kV auxiliary frequency modulation sub-module and the 10kV auxiliary frequency modulation sub-module, respectively.
Optionally, the first power command is a sum of fourth output power commands of each single-phase three-level topology unit in the multi-level converter unit before receiving the frequency modulation command.
Optionally, the controller is configured to calculate a fifth output power command corresponding to each single-phase three-level topology unit based on the first output power command, the power command required for frequency modulation, and a state of charge of each battery cluster.
Optionally, the calculation formula of the fifth output power instruction is as follows:
wherein Pa is the first output power instruction, pb is the total output power instruction before the multilevel converter unit receives the frequency modulation instruction, pf is the power instruction required for frequency modulation, N is the number of the single-phase three-level topological units in each bridge arm of the multilevel converter unit, SOCa is the state of charge corresponding to any battery cluster, and SOCb is the average state of charge of each battery cluster.
The embodiment of the disclosure has at least the following beneficial effects:
the energy storage system can take account of independent energy storage and primary frequency modulation, the energy storage module responds to the primary frequency modulation demands of different thermal power units on the basis of participating in peak regulation service of the power system, flexibility and collaborative optimization control can be achieved, and on the basis of guaranteeing normal operation of an independent energy storage power station, auxiliary power market auxiliary services such as frequency modulation and black start are achieved for the thermal power units, so that flexibility and economic benefit of a traditional thermal power plant are improved. The single-phase three-level topological unit has the advantages of low voltage stress of a switching tube, wide voltage range and the like. The voltage stress of the three-level main power device is only half of that of two levels, so that the direct-current side withstand voltage of the three-level main power device can be further improved, the number of the series battery cells is improved by fully utilizing the consistency guarantee capability of the existing battery clusters, the single-machine capacity of the energy storage system is improved, and the power density and the integration degree of the system are improved. The invention uses the multi-level converter as the main power PCS of the independent energy storage system, can omit a power frequency transformer to improve the system efficiency, solves the problems of circulation and low efficiency among battery clusters of the centralized energy storage system, and respectively expands the auxiliary frequency modulation subsystems of different voltage grades, so that the independent energy storage system responds to the primary frequency modulation requirements of different thermal power generating units on the basis of participating in the peak regulation service of the power system, improves the application range of the independent energy storage system, and fully plays the function of the independent energy storage system.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of an energy storage system according to an embodiment of the disclosure;
fig. 2 is a schematic structural diagram of a single-phase three-level topology unit according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of an overall electrical design of an energy storage system according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of another energy storage system according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a bypass process under fault of a single-phase three-level topology unit according to an embodiment of the present disclosure.
Detailed Description
Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present disclosure and are not to be construed as limiting the present disclosure.
An energy storage system of an embodiment of the present disclosure is described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an energy storage system according to an embodiment of the disclosure.
As shown in fig. 1, the energy storage system comprises an energy storage module, an auxiliary frequency modulation module and a controller,
the energy storage module comprises a multi-level converter unit, a plurality of battery clusters and a battery management unit, the auxiliary frequency modulation module comprises a plurality of DC/DC converters and a plurality of DC/AC converters, and the battery management unit controls the single-phase three-level topological unit corresponding to any battery cluster in the multi-level converter unit to be disconnected based on the controller under the condition that any battery cluster is detected to have battery faults.
The multi-level converter unit comprises a plurality of single-phase three-level topological units.
The multi-level converter unit may be a modular multi-level converter (MMC, modular multilevel converter), among others.
The single-phase three-level topological unit can be a single-phase three-level NPC (Neutral-point clamped) converter.
It should be noted that each single-phase three-level topology unit may be connected with a battery cluster.
The battery clusters can be subdivided into a first battery cluster and a second battery cluster, namely, the battery clusters can be formed by connecting 2 battery clusters in series. It should be noted that the first battery cluster and the second battery cluster may be independently operated, so that the consistency of the batteries may be further ensured.
The single-phase three-level topological unit can output three levels of positive level, negative level and zero level, and fault current blocking is conveniently achieved.
It should be noted that, compared with the half-bridge sub-module, the single-phase three-level topological unit has the advantages of low voltage stress of the switching tube, wide voltage range and the like. The voltage stress of the three-level main power device is only half of that of two levels, so that the direct-current side withstand voltage of the three-level main power device can be further improved, the number of the series battery cells is improved by fully utilizing the consistency guarantee capability of the existing battery clusters, the single-machine capacity of the energy storage system is improved, and the power density and the integration degree of the system are improved.
Optionally, the multi-level converter unit comprises a plurality of single-phase three-level topology units, each of the single-phase three-level topology units comprises three Half-Bridge modules (HBMs), a dc port and an ac side contactor switch,
as shown in fig. 2, fig. 2 shows a schematic structure of a single-phase three-level topology unit.
The unidirectional three-level topological unit comprises 3 half-bridge modules, namely HBM1, HBM2 and HBM3, direct-current capacitors C1 and C2 of a direct-current port, a first battery cluster R1 and a second battery cluster R2 which are connected with the unidirectional three-level topological unit, and an alternating-current side contactor switch X.
The direct current port is connected with auxiliary equipment, and the auxiliary equipment at least comprises the battery cluster and a contactor.
Optionally, each battery cluster includes a first battery cluster and a second battery cluster, and a midpoint of the first battery cluster and a midpoint of the second battery cluster are connected with a midpoint of a dc capacitor corresponding to the dc port.
The direct current port is connected with auxiliary equipment such as a battery cluster, a contactor and the like, and the alternating current port is connected with a bridge arm inductor in series.
As shown in fig. 3, fig. 3 shows a schematic diagram of the overall electrical design of an energy storage system.
Optionally, the ac output side of the energy storage module is connected with a 35kV busbar of the energy storage power station, and the 35kV busbar of the energy storage power station is connected to a 220kV power grid through a main transformer of the energy storage power station.
The energy storage module is composed of an MMC (Modular multilevel converter, modularized multi-level converter) high-voltage direct-hanging energy storage converter, namely the multi-level converter unit, the multi-level converter unit is connected with an energy storage direct-current bus through a pre-charging circuit, and then the energy storage module can be connected into a 6kV station service bus and a 10kV station service bus through a 6kV auxiliary frequency modulation sub-module and a 10kV auxiliary frequency modulation sub-module respectively.
The 6kV auxiliary frequency modulation sub-module and the 10kV auxiliary frequency modulation sub-module are the PCS (Power Conversion System ) boosting system shown in fig. 3.
As shown in fig. 4, the multi-level converter unit is connected with the energy storage dc bus through the precharge circuit, and includes a plurality of bridge arms and a plurality of PCS power units, where each PCS power unit is the unidirectional three-level topology unit. Each bridge arm comprises N unidirectional three-level topological units, namely PCS#1 to PCS#N or PCS#N+1 to PCS#2N.
The input sides of the plurality of DC/DC converters are connected in series with the energy storage direct current bus, the output sides of the plurality of DC/DC converters are connected in parallel with the plurality of DC/AC converters, and the plurality of DC/AC converters are converged into a 6kV station service bus or a 10kV station service bus through a transformer. That is, the energy storage direct current bus can be connected into each DC/AC converter through a plurality of DC/DC converters in an ISOP (Input series output parallel) mode, input and output are connected in parallel, and further can be respectively connected into the 6kV or 10kV station service buses of different generator sets through the PCS boosting system and the transformer to provide primary frequency modulation service.
It should be noted that, when the energy storage system starts to operate, the dc bus capacitor is charged, so that the auxiliary fm subsystem enters a standby state.
It can be understood that compared with the half-bridge type submodule, the single-phase three-level topological unit provided by the invention has the capability of outputting zero voltage and positive voltage level and simultaneously can also output negative voltage level, so that fault current blocking is conveniently realized. Each single-phase three-level topological unit of the energy storage system can generate a battery cluster fault, so that the internal short circuit or the open circuit of the unit is caused. For the purpose of protecting the battery and avoiding the expansion of accidents, the corresponding whole single-phase three-level topological unit should be subjected to bypass cutting. The ablation logic is as shown in fig. 5: and after detecting and finding out the battery fault, the battery management unit sends a fault alarm signal to the controller under the condition that the battery fault occurs in the battery cluster. The controller controls the corresponding single-phase three-level topology unit to output zero level (S2, S3, S5, S6 are opened and S1, S4 are closed), and then drives the contactor to bypass the power unit.
And under the condition that the fault alarm signal is received, the controller controls the single-phase three-level topological unit corresponding to the battery cluster to output zero level. It should be noted that, the single-phase three-level topological unit can output three levels of positive, negative and zero, so as to conveniently realize blocking of fault current and equalization of flexible battery cluster SOC.
Optionally, the multilevel converter unit is configured to generate a first output power instruction and superimpose a power instruction required for frequency modulation after receiving the frequency modulation instruction, where the auxiliary frequency modulation module includes a 6kV auxiliary frequency modulation sub-module and a 10kV auxiliary frequency modulation sub-module, and the power instruction required for frequency modulation includes a second output power instruction and a third output power instruction corresponding to the 6kV auxiliary frequency modulation sub-module and the 10kV auxiliary frequency modulation sub-module, respectively.
∑P ref,xn ＝∑P org,xn +P f (x＝A,B,C；n＝1,2,....,2N)
Wherein P is ref,xn Is the total output power instruction corresponding to the single-phase three-level topological unit n, P org,xn Is a fourth output power instruction, P, of the single-phase three-level topological unit n before receiving the frequency modulation instruction f Is a power command required for frequency modulation.
P f ＝P f1 +P f2
Wherein P is f1 、P f2 The second output power instruction and the third output power instruction which are required by the frequency modulation of the 6kV auxiliary frequency modulation subsystem and the 10kV auxiliary frequency modulation subsystem are respectively adopted.
P MMC,ac ＝∑P org,xn
Wherein P is MMC,ac The power is output for the alternating current side of the multilevel converter cell.
P MMC,dc_bus ＝P f
Wherein P is MMC,dc_bus The power is output for the direct current side of the multilevel converter cell.
Optionally, the first power command is a sum of fourth output power commands of each single-phase three-level topology unit in the multi-level converter unit before receiving the frequency modulation command.
Optionally, the controller is configured to calculate a fifth output power command corresponding to each single-phase three-level topology unit based on the first output power command, the power command required for frequency modulation, and the state of charge of each battery cluster.
Optionally, the calculation formula of the fifth output power instruction is as follows:
wherein Pa is the first output power instruction, pb is the total output power instruction before the multilevel converter unit receives the frequency modulation instruction, pf is the power instruction required for frequency modulation, N is the number of the single-phase three-level topological units in each bridge arm of the multilevel converter unit, SOCa is the state of charge corresponding to any battery cluster, and SOCb is the average state of charge of each battery cluster.
It should be noted that, the power distribution of each single-phase three-level topological unit can be flexibly adjusted by the battery management unit according to the charge state of each battery cluster, so as to improve the availability of the system.
It should be noted that, the battery cluster in the embodiment of the disclosure may adopt a 1P320S (1parallel 320series) battery cluster, so that under the condition of ensuring that the working current and the device withstand voltage are the same, the first battery cluster and the second battery cluster of each single-phase three-level topological unit in the structure provided by the invention can be accessed according to 1P320S, and therefore, the power and the capacity of each module are improved to twice as much as the original power and capacity.
The embodiment of the disclosure has at least the following beneficial effects:
the multi-port energy storage system structure can give consideration to independent energy storage and primary frequency modulation, the energy storage module responds to the primary frequency modulation requirements of different thermal power units on the basis of participating in peak regulation service of the power system, flexibility and collaborative optimization control can be achieved, and the auxiliary service of the thermal power units in the electric power market such as frequency modulation, black start and the like is assisted on the basis of guaranteeing normal operation of independent energy storage power stations, so that flexibility and economic benefit of a traditional thermal power plant are improved. The single-phase three-level topological unit has the advantages of low voltage stress of a switching tube, wide voltage range and the like. The voltage stress of the three-level main power device is only half of that of two levels, so that the direct-current side withstand voltage of the three-level main power device can be further improved, the number of the series battery cells is improved by fully utilizing the consistency guarantee capability of the existing battery clusters, the single-machine capacity of the energy storage system is improved, and the power density and the integration degree of the system are improved. The invention uses the multi-level converter as the main power PCS of the independent energy storage system, can omit a power frequency transformer to improve the system efficiency, solves the problems of circulation and low efficiency among battery clusters of the centralized energy storage system, and respectively expands the auxiliary frequency modulation subsystems of different voltage grades, so that the independent energy storage system responds to the primary frequency modulation requirements of different thermal power generating units on the basis of participating in the peak regulation service of the power system, improves the application range of the independent energy storage system, and fully plays the function of the independent energy storage system.
The description of "an example," "a particular example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless explicitly specified otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present disclosure in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It should be understood that portions of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
Furthermore, each functional unit in the embodiments of the present disclosure may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. Although embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the present disclosure.
Claims (7)
1. An energy storage system is characterized by comprising an energy storage module, an auxiliary frequency modulation module and a controller,
the energy storage module comprises a multi-level converter unit, a plurality of battery clusters and a battery management unit, the auxiliary frequency modulation module comprises a plurality of DC/DC converters and a plurality of DC/AC converters, and the battery management unit controls a single-phase three-level topological unit corresponding to any battery cluster in the multi-level converter unit to be disconnected based on the controller under the condition that any battery cluster is detected to have a battery fault;
the multi-level converter unit is used for generating a first output power instruction and superposing a power instruction required by frequency modulation after receiving the frequency modulation instruction, the auxiliary frequency modulation module comprises a 6kV auxiliary frequency modulation sub-module and a 10kV auxiliary frequency modulation sub-module, and the power instruction required by frequency modulation comprises a second output power instruction and a third output power instruction which respectively correspond to the 6kV auxiliary frequency modulation sub-module and the 10kV auxiliary frequency modulation sub-module;
the controller is configured to calculate a fifth output power instruction corresponding to each single-phase three-level topology unit based on the first output power instruction, the power instruction required for frequency modulation, and a state of charge of each battery cluster, where a calculation formula of the fifth output power instruction is as follows:
wherein Pa is the first output power instruction, pb is the total output power instruction before the multilevel converter unit receives the frequency modulation instruction, pf is the power instruction required for frequency modulation, N is the number of the single-phase three-level topological units in each bridge arm of the multilevel converter unit, SOCa is the state of charge corresponding to any battery cluster, and SOCb is the average state of charge of each battery cluster.
2. The energy storage system of claim 1, wherein the ac output side of the energy storage module is connected to an energy storage power station 35kV bus, and the energy storage power station 35kV bus is connected to a 220kV power grid via an energy storage power station main transformer.
3. The energy storage system of claim 1, wherein,
the multi-level converter unit is connected with the energy storage direct current bus through a pre-charging circuit,
the input sides of the plurality of DC/DC converters are connected in series to the energy storing direct current bus,
the output sides of the plurality of DC/DC converters are connected in parallel to the plurality of DC/AC converters,
the plurality of DC/AC converters are converged into a 6kV station service bus or a 10kV station service bus through a transformer.
4. The energy storage system of claim 1, wherein said multilevel converter cell comprises a plurality of single phase three level topology cells, each of said single phase three level topology cells comprising three half bridge modules, a DC port and an AC side contactor switch,
the direct current port is connected with auxiliary equipment, and the auxiliary equipment at least comprises the battery cluster and a contactor.
5. The system of claim 4, wherein each of the battery clusters comprises a first battery cluster and a second battery cluster, wherein a midpoint of the first battery cluster and the second battery cluster is connected to a midpoint of a dc capacitance corresponding to the dc port.
6. The system of claim 1, wherein,
the battery management unit is further configured to: under the condition that the battery cluster is detected to have a battery fault, a fault alarm signal is sent to the controller;
and under the condition that the fault alarm signal is received, the controller controls the single-phase three-level topological unit corresponding to the battery cluster to output zero level.
7. The system of claim 1, wherein the first output power command is a sum of fourth output power commands of each single-phase three-level topology unit in the multi-level converter unit prior to receiving the frequency modulation command.
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