Multi-level state-of-charge balance unified control method and system for energy storage system

A state-of-charge, energy storage system technology, which is used in electrical energy storage systems, charge balancing circuits, and AC network load balancing, etc., to achieve the effect of smooth balancing process and improved availability.

Active Publication Date: 2021-03-16
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of the existing technologies can effectively solve these problems

Method used

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  • Multi-level state-of-charge balance unified control method and system for energy storage system
  • Multi-level state-of-charge balance unified control method and system for energy storage system
  • Multi-level state-of-charge balance unified control method and system for energy storage system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] This embodiment provides a non-linear function-based state-of-charge balance control method for multiple energy storage power stations (energy storage power station groups).

[0069] There are multiple energy storage power stations in the regional distribution network, such as Figure 1a As shown, each energy storage power station exchanges information with the distribution network monitoring and energy management system, and accepts the power commands issued by it. The distribution network monitoring and energy management system is the place where the control method of this embodiment is realized, and the control method flow is as follows: figure 2 shown.

[0070] The distribution network monitoring and energy management system collects all running SoCs of the energy storage power station through communication equipment sample data, calculate the corresponding DoD sample data (DoD sample =1-SoC sample ), construct the f(x) and g(x) functions:

[0071] SoC=f(SoC ...

Embodiment 2

[0098] This embodiment provides a non-linear function-based method for controlling the state of charge balance of multiple battery stacks.

[0099] An energy storage power station consists of multiple battery stacks, such as Figure 1b As shown, each battery stack (including the supporting converter) exchanges information with the power station control and protection system, and accepts the power command issued by it. The power station control and protection system is the place where the control method of this embodiment is realized, and the control method flow is as follows figure 2 shown.

[0100] The power station control and protection system collects all operating battery stack SoCs through communication equipment sample data, calculate the corresponding DoD sample data (DoD sample =1-SoC sample), construct f(x) and g(x) functions:

[0101] SoC=f(SoC sample )=(SoC sample ) 3

[0102] DoD=g(DoD sample )=(DoD sample ) 3

[0103] The f(x) and g(x) functions ar...

Embodiment 3

[0128] This embodiment provides a non-linear function-based method for controlling state of charge balance of a multi-battery cluster.

[0129] An energy storage power station battery stack is composed of multiple battery clusters, such as Figure 1c As shown in , each battery cluster interacts with the battery cluster management system and accepts the power commands issued by it. The battery cluster management system is the place where the control method of this embodiment is implemented, and the flow of the control method is as follows: figure 2 shown.

[0130] The battery cluster management system collects all running battery cluster SoCs through communication equipment sample data, calculate the corresponding DoD sample Data (DoD sample = 1-SoC sample ), construct f(x) and g(x) functions:

[0131] SoC=f(SoC sample )=(SoC sample ) 2

[0132] DoD=g(DoD sample )=(DoD sample ) 5

[0133] The f(x) and g(x) functions are monotonously continuous within the SoC cont...

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Abstract

The invention discloses a multi-level charge state balance unified control method and system for an energy storage system. The energy storage system is developed towards a large-scale, large-capacityand hierarchical direction, and in order to fully utilize the energy storage system, the balance of multi-level SoC of a power station, a battery stack, a battery cluster and the like needs to be considered. According to the method, a continuous nonlinear function is adopted, the state of charge and the discharge depth value of the units needing to be equalized such as the power station, the battery stack and the battery cluster obtained through sampling are converted, and then active power instructions of the units needing to be equalized are given in proportion in sequence according to the converted state of charge or the converted discharge depth. According to the invention, a unified SoC equalization strategy is provided for a hierarchical energy storage system, and by selecting a proper continuous nonlinear function, the equalization process can be ensured to be stable and rapid, the availability of the energy storage system and the grid-connected friend satisfaction can be improved to the maximum extent, and rapid plug and play can be realized.

Description

technical field [0001] The invention belongs to the field of energy storage control, and relates to the control of an energy storage system, in particular to a multi-level state-of-charge balance control method and system for an energy storage system based on a nonlinear function. Background technique [0002] The energy storage system can realize the flexible storage and release of electric energy, and is one of the key technologies to achieve my country's energy transition and 2060 "carbon neutrality" goals. Through the energy storage system on the power supply side, grid side and user side, the flexibility of power system operation can be significantly improved, new energy consumption can be promoted, and comprehensive energy utilization efficiency can be improved, which has significant comprehensive benefits. In addition, electrochemical energy storage systems can achieve fast power conversion within milliseconds, which has huge advantages over traditional units. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44H02J7/00H02J3/32H02J15/00
CPCH01M10/4207H01M10/441H02J7/0014H02J3/32H02J15/00H01M2010/4271Y02E60/10
Inventor 章雷其赵波张雪松徐珂钱啸章姝俊
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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