CONTROL METHOD FOR ENERGY STORAGE SYSTEM AND ENERGY STORAGE SYSTEM

1 . A control method for an energy storage system, wherein the energy storage system comprises N energy storage sub-modules, N being a positive integer greater than 1, the method comprising:

Acquiring an SOC and a charge-discharge limiting current of each of the N energy storage sub-modules; and

Controlling working states of the N energy storage sub-modules according to the SOC and the charge-discharge limiting current of each of the energy storage sub-modules, the working states comprising a switched-on state and a switched-off state.

2 . The control method according to claim 1 , wherein the method further comprises:

Acquiring a charge-discharge limiting current of the energy storage system; and

the controlling states of the N energy storage sub-modules comprising:

controlling the states of the N energy storage sub-modules according to the SOC of each of the energy storage sub-modules, the charge-discharge limiting current of each of the energy storage sub-modules, and the charge-discharge limiting current of the energy storage system.

3 . The control method according to claim 2 , wherein the controlling the states of the N energy storage sub-modules according to the SOC of each of the energy storage sub-modules, the charge-discharge limiting current of each of the energy storage sub-modules, and the charge-discharge limiting current of the energy storage system, comprises:

in a case that I 1 is greater than or equal to I 2 , determining n energy storage sub-modules in the N energy storage sub-modules according to the SOC of each of the energy storage sub-modules, controlling the n energy storage sub-modules to be in switched-on states, and controlling remaining energy storage sub-modules in the N energy storage sub-modules to be in switched-off states,

wherein, I 1 is a minimum charge-discharge limiting current in the charge-discharge limiting currents of the N energy storage sub-modules, I 2 is the charge-discharge limiting current of the energy storage system, and n is a number of the energy storage sub-modules to be switched on.

4 . The control method according to claim 3 , wherein the determining n energy storage sub-modules, comprises:

in a case that the energy storage system is charged, selecting the n energy storage sub-modules with minimum SOCs from the N energy storage sub-modules.

5 . The control method according to claim 3 , wherein the determining n energy storage sub-modules, comprises:

in a case that the energy storage system is discharged, selecting the n energy storage sub-modules with maximum SOCs from the N energy storage sub-modules.

6 . The control method according to claim 2 , wherein the controlling the states of the N energy storage sub-modules according to the SOC of each of the energy storage sub-modules, the charge-discharge limiting current of each of the energy storage sub-modules, and the charge-discharge limiting current of the energy storage system, comprises:

in a case that I 1 is less than I 2 and M is greater than or equal to n, determining n energy storage sub-modules in the M energy storage sub-modules according to the SOC of each of the energy storage sub-modules, controlling the n energy storage sub-modules to be in switched-on states, and controlling remaining energy storage sub-modules in the M energy storage sub-modules to be in switched-off states,

wherein, I 1 is a minimum charge-discharge limiting current in the charge-discharge limiting currents of the N energy storage sub-modules, I 2 is the charge-discharge limiting current of the energy storage system, M is a number of the energy storage sub-modules of which the charge-discharge limiting currents are not less than 12, the M energy storage sub-modules are the energy storage sub-modules of which the charge-discharge limiting currents are not less than that of the energy storage system, and n is a number of the energy storage sub-modules needing to be switched on.

7 . The control method according to claim 6 , wherein the determining n energy storage sub-modules, comprises:

in a case that the energy storage system is charged, selecting the n energy storage sub-modules with minimum SOCs from the M energy storage sub-modules.

8 . The control method according to claim 6 , wherein the determining n energy storage sub-modules, comprises:

in a case that the energy storage system is discharged, selecting the n energy storage sub-modules with maximum SOCs from the M energy storage sub-modules.

9 . The control method according to claim 2 , wherein the method further comprises:

in a case that I 1 is less than I 2 and M is less than n, controlling the energy storage system to decrease a value of n, or controlling the energy storage system to be shut down,

wherein, I 1 is a minimum charge-discharge limiting current in the charge-discharge limiting currents of the N energy storage sub-modules, I 2 is a charge-discharge limiting current of the energy storage system, M is the number of the energy storage sub-modules of which the charge-discharge currents are not less than I 2 , and n is the number of the energy storage sub-modules needing to be switched on.

10 . An energy storage system, wherein the energy storage system comprises:

N energy storage sub-modules, N being a positive integer greater than 1; and

a controller, configured to acquire an SOC and a charge-discharge limiting current of each of the energy storage sub-module in the N energy storage sub-modules, and controlling working states of the N energy storage sub-modules according to the SOC and the charge-discharge limiting current of each of the energy storage sub-modules, the working states comprising a switched-on state and a switched-off state.

11 . The energy storage system according to claim 10 , wherein the controller is configured to:

acquire a charge-discharge limiting current of the energy storage system; and

the controlling states of the N energy storage sub-modules, comprises:

controlling the states of the N energy storage sub-modules according to the SOC of each of the energy storage sub-modules, the charge-discharge limiting current of each of the energy storage sub-modules, and the charge-discharge limiting current of the energy storage system.

12 . The energy storage system according to claim 11 , wherein the controller is configured to:

in a case that I 1 is greater than or equal to I 2 , determining n energy storage sub-modules in the N energy storage sub-modules according to the SOC of each of the energy storage sub-modules, controlling the n energy storage sub-modules to be in switched-on states, and controlling remaining energy storage sub-modules in the N energy storage sub-modules to be in switched-off states,

wherein, I 1 is a minimum charge-discharge limiting current in the charge-discharge limiting currents of the N energy storage sub-modules, I 2 is the charge-discharge limiting current of the energy storage system, and n is a number of the energy storage sub-modules needing to be switched on.

13 . The energy storage system according to claim 12 , wherein the controller is configured to:

in a case that the energy storage system is charged, select n energy storage sub-modules with minimum SOCs from the N energy storage sub-modules.

14 . The energy storage system according to claim 12 , wherein the controller is configured to:

in a case that the energy storage system is discharged, select the n energy storage sub-modules with maximum SOCs from the N energy storage sub-modules.

15 . The energy storage system according to claim 11 , wherein the controller is configured to:

in a case that I 1 is less than I 2 and M is greater than or equal to n, determine energy storage sub-modules in the M energy storage sub-modules according to the SOC of each of the energy storage sub-modules, control the n energy storage sub-modules to be in switched-on states, and control remaining energy storage sub-modules in the M energy storage sub-modules to be in switched-off states,

wherein, I 1 is a minimum charge-discharge limiting current in the charge-discharge limiting currents of the N energy storage sub-modules, I 2 is the charge-discharge limiting current of the energy storage system, M is a number of the energy storage sub-modules of which the charge-discharge limiting currents are not less than I 2 , the M energy storage sub-modules are the energy storage sub-modules of which the charge-discharge limiting currents are not less than that of the energy storage system, and n is a number of the energy storage sub-modules needing to be switched on.

16 . The energy storage system according to claim 15 , wherein the controller is configured to:

in a case that the energy storage system is charged, select the n energy storage sub-modules with minimum SOCs from the M energy storage sub-modules.

17 . The energy storage system according to claim 15 , wherein the controller is configured to:

in a case that the energy storage system is discharged, select the n energy storage sub-modules with maximum SOCs from the M energy storage sub-modules.

18 . The energy storage system according to claim 11 , wherein the controller is further configured to:

in a case that I 1 is less than I 2 and M is less than n, control the energy storage system to decrease a value of n, or control the energy storage system to be shut down,

wherein, I 1 is a minimum charge-discharge limiting current in the charge-discharge limiting currents of the N energy storage sub-modules, I 2 is the charge-discharge limiting current of the energy storage system, M is the number of the energy storage sub-modules of which the charge-discharge currents are not less than I 2 , and n is the number of the energy storage sub-modules needing to be switched on.

19 . A device for controlling an energy storage system, wherein the device comprises a processor and a memory, the memory being configured to store a computer program, and the processor being configured to invoke the computer program to enable the device to implement the method of claim 1 .