CN-122026449-A - Energy storage system, control method, device, equipment, medium and program product thereof

Abstract

The application relates to an energy storage system, a control method, a control device, a control medium and a control program product. The energy storage system comprises an energy storage device, wherein the energy storage device is used for being connected with a power system and comprises a plurality of energy storage sub-modules, the plurality of energy storage sub-modules at least comprise a first energy storage unit and a second energy storage unit, the charge and discharge rates of the first energy storage unit and the second energy storage unit are different, the energy storage sub-modules comprise power units, and one sides of the power units are respectively and electrically connected with the first energy storage unit and/or the second energy storage unit belonging to the same energy storage sub-module. The application can not only provide short-time heavy current supporting capability, but also provide long-term electric power and electricity balance service.

Inventors

• YUAN XIAOTIAN
• Liang Liliuyuan
• WANG SHENG
• YU DONGXU
• LU YANHUA
• PENG HAO
• Zong Yanyun
• XIE YI

Assignees

• 宁德时代未来能源(上海)研究院有限公司
• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260512

Application Date

20241101

Claims (20)

1. 1. An energy storage system, the energy storage system comprising: The energy storage device is used for being connected with the power system and comprises a plurality of energy storage sub-modules, wherein the plurality of energy storage sub-modules at least comprise a first energy storage unit and a second energy storage unit, and the charge and discharge rates of the first energy storage unit and the second energy storage unit are different; The energy storage submodule comprises a power unit, and one side of the power unit is electrically connected with the first energy storage unit and/or the second energy storage unit which belong to the same energy storage submodule.
2. 2. The energy storage system of claim 1, wherein a plurality of said energy storage sub-modules are connected in series on a first energy-delivery main line of said energy storage device.
3. 3. The energy storage system of claim 1, wherein the plurality of energy storage sub-modules comprises a plurality of first energy storage sub-modules and a plurality of second energy storage sub-modules; the plurality of first energy storage submodules are connected in series on a first energy transmission main line of the energy storage device; The plurality of second energy storage sub-modules are connected in series on a second energy transmission main line of the energy storage device; The first energy transmission main line and the second energy transmission main line are connected in parallel.
4. 4. The energy storage system of any of claims 1 to 3, wherein the charge and discharge rates of the first energy storage unit and the second energy storage unit differ by more than a factor of 10.
5. 5. The energy storage system of any of claims 1 to 4, wherein the number ratio of the first energy storage unit to the second energy storage unit is 1:1 to 1:5.
6. 6. The energy storage system of any one of claims 1 to 5, wherein, of the first energy storage unit and the second energy storage unit, the energy storage unit with a high charge-discharge rate comprises a high-rate cell or a super capacitor, and the energy storage unit with a low charge-discharge rate comprises a low-rate cell.
7. 7. The energy storage system of any of claims 1 to 6, further comprising a converter valve, one side of the converter valve being for connection to the power system, the other side of the converter valve being connected to the energy storage device.
8. 8. The energy storage system of claim 7, wherein the converter valve comprises a multi-level converter in which full-bridge modules and half-bridge modules are mixed, and wherein the ratio of the number of full-bridge modules to half-bridge modules is inversely related to the ratio of the dc voltage of the energy storage device to the ac voltage of the converter valve.
9. 9. The energy storage system of claim 7, further comprising a control device coupled to the energy storage device; The control device is used for controlling the first energy storage unit to be connected with the energy transmission passage and controlling the second energy storage unit to cut out the energy transmission passage under the condition that the energy storage device is determined to adopt a first power supply mode, and controlling the second energy storage unit to be connected with the energy transmission passage and controlling the first energy storage unit to cut out the energy transmission passage under the condition that the energy storage device is determined to adopt a second power supply mode.
10. 10. The energy storage system of claim 9, wherein the energy storage system comprises, The control device is also used for controlling the converter valve to perform alternating current-direct current conversion.
11. 11. The energy storage system of claim 1, wherein the first energy storage unit has a higher charge and discharge rate than the second energy storage unit, the first energy storage sub-module comprises the first energy storage unit, the second energy storage sub-module comprises the second energy storage unit, the number of the first energy storage sub-modules is positively correlated with the short-time high-rate power demand, and the number of the second energy storage sub-modules is positively correlated with the peak shaving standby power long-time power demand.
12. 12. The energy storage system of claim 11, wherein the number of first energy storage sub-modules is proportional to the short-time high-rate electrical demand and is modified according to a redundancy configuration amount and an electrical supermatch rate, and wherein the number of second energy storage sub-modules is proportional to the peak shaving standby time period electrical demand and is modified according to the redundancy configuration amount and the electrical supermatch rate.
13. 13. The energy storage system of claim 11, wherein the capacity of the first energy storage sub-module and the number of in-module electrical cabinets in parallel, and the capacity of the second energy storage sub-module and the number of in-module electrical cabinets in parallel are related to sub-module voltage levels; The submodule voltage level is related to system parameters, and the system parameters comprise one or more of system voltage, capacity parameters, first energy storage unit parameters, second energy storage unit parameters, system inertia parameters, system frequency modulation rate parameters and system peak regulation standby electricity duration parameters.
14. 14. A method of controlling an energy storage system, the method comprising: under the condition that an energy storage device in an energy storage system adopts a first power supply mode, controlling a first energy storage unit of the energy storage device to be connected with an energy transmission passage, and controlling a second energy storage unit of the energy storage device to cut out the energy transmission passage; And under the condition that the energy storage device adopts a second power supply mode, controlling the second energy storage unit to be connected into the energy transmission passage, and controlling the first energy storage unit to cut out the energy transmission passage.
15. 15. The method of claim 14, wherein the method further comprises: when the fluctuation amount of the system frequency of the power system is larger than a variation threshold value, a scheduling instruction of the power system is received, and inertia response and primary frequency modulation are determined not to be finished, the energy storage device is determined to adopt the first power supply mode; and under the condition that the fluctuation amount of the system frequency is larger than the variation amount threshold value and the scheduling instruction is received, and the inertia response and the primary frequency modulation are determined to be finished, determining that the energy storage device adopts the second power supply mode.
16. 16. The method of claim 14, wherein the method further comprises: under the condition that the energy storage device adopts the first power supply mode, controlling the working mode of a converter valve in the energy storage system to be an inertia and primary frequency modulation mode; And under the condition that the energy storage device adopts the second power supply mode, controlling the working mode of the converter valve to be a secondary frequency modulation mode.
17. 17. A control device for an energy storage system, the device comprising: The first control module is used for controlling a first energy storage unit of the energy storage device to be connected with an energy transmission passage and controlling a second energy storage unit of the energy storage device to cut out the energy transmission passage under the condition that the energy storage device in the energy storage system is determined to adopt a first power supply mode; And the second control module is used for controlling the second energy storage unit to be connected into the energy transmission passage and controlling the first energy storage unit to cut out of the energy transmission passage under the condition that the energy storage device is determined to adopt a second power supply mode.
18. 18. An electronic device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the method of any of claims 14 to 16 when executing the computer program.
19. 19. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the method of any of claims 14 to 16.
20. 20. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements the method of any of claims 14 to 16.

Description

Energy storage system, control method, device, equipment, medium and program product thereof Technical Field The present application relates to the technical field of power systems, and in particular, to an energy storage system, and a control method, apparatus, device, medium and program product thereof. Background With the development of new energy technology, the power system has strong demands on the energy storage system with high voltage/large capacity, short-time high-power inertia support/frequency modulation support and long-time electric power and electric quantity balance support. At present, the energy storage system provides short-time high-current supporting capability and long-term electric power and electricity balance service during transient state, and is a main research direction. Disclosure of Invention Based on the above problems, the present application provides an energy storage system, and a control method, a control device, a control apparatus, a medium and a program product thereof, so that the energy storage system can provide a short-time high-current supporting capability and a long-time electric power and quantity balancing service. The application provides an energy storage system, which comprises an energy storage device, wherein the energy storage device is used for being connected with a power system and comprises a plurality of energy storage sub-modules, the plurality of energy storage sub-modules at least comprise a first energy storage unit and a second energy storage unit, the charge and discharge rates of the first energy storage unit and the second energy storage unit are different, the energy storage sub-modules comprise power units, and one sides of the power units are respectively and electrically connected with the first energy storage unit and/or the second energy storage unit belonging to the same energy storage sub-module. According to the technical scheme, the energy storage device of the energy storage system comprises the energy storage units with different charge and discharge rates, and the energy storage units with different charge and discharge rates can be put into according to different operation modes of the power system, so that short-time heavy current support is provided, or long-term power and electric quantity balance service is provided, the energy storage system can provide multi-stage inertia, frequency modulation and peak regulation service, and the energy storage system is more suitable for actual requirements of the power system. In some embodiments, the plurality of energy storage sub-modules are connected in series on the first energy transmission main line of the energy storage device. The energy storage sub-modules are connected in series, and an output end at the other side of a power unit in one energy storage sub-module is connected with an input end at the other side of the power unit in the next energy storage sub-module to form a cascade energy storage sub-module, which can be boosted in cascade and directly hung on a high-voltage bus, such as a high-voltage alternating-current power grid, a high-voltage direct-current power grid, a power distribution network, a micro-grid and the like. High voltage refers to a voltage class above 10KV and provides support for a large power grid. In the technical scheme of the embodiment of the application, the energy storage device has the advantages of simple and easy realization, low design cost and low assembly cost, and the energy storage system can provide short-time heavy current support and long-term electric power and electric quantity balance service due to different charge and discharge rates of different energy storage units. In some embodiments, the plurality of energy storage sub-modules comprise a plurality of first energy storage sub-modules and a plurality of second energy storage sub-modules, the plurality of first energy storage sub-modules are connected in series on a first energy transmission main line of the energy storage device, the plurality of second energy storage sub-modules are connected in series on a second energy transmission main line of the energy storage device, and the first energy transmission main line and the second energy transmission main line are connected in parallel. According to the technical scheme, the energy storage sub-modules are built by the energy storage units with different charge and discharge rates, and the energy storage device is built by the energy storage sub-modules, so that the control device can activate the energy storage units with different charge and discharge rates in the energy storage device according to the requirements of inertia, frequency modulation and peak regulation, and a power system is better supported. In some embodiments, the charge and discharge rates of the first energy storage unit and the second energy storage unit differ by more than a factor of 10. According to the technical scheme, the energy storage system c