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A method and system for multi-level state of charge balance unified control of an energy storage system

A state-of-charge, energy storage system technology, applied in electrical energy storage systems, charge balancing circuits, AC network load balancing, etc., to achieve the effect of improving availability, no impact, and smooth balancing process

Active Publication Date: 2022-04-19
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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  • A method and system for multi-level state of charge balance unified control of an energy storage system
  • A method and system for multi-level state of charge balance unified control of an energy storage system
  • A method and system for multi-level state of charge balance unified control of an energy storage system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] This embodiment provides a non-linear function-based control method for state of charge balance of 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 in , each energy storage power station interacts with the distribution network monitoring and energy management system, and accepts the power command issued by it. The distribution network monitoring and energy 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.

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

[0071] SoC=f(SoC sa...

Embodiment 2

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

[0099] An energy storage power station consists of multiple battery stacks, such as Figure 1b As shown, each battery stack (including supporting converters) interacts with the control and protection system of the power station, and accepts the power command issued by it. The control and protection system of the power station 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.

[0100] The power station control and protection system collects all running 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 are ...

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 method and system for uniformly controlling the multi-level state of charge of an energy storage system. The energy storage system is developing towards a large-scale, large-capacity, and hierarchical direction. In order to make full use of the energy storage system, it is necessary to consider the balance of multi-level SoCs such as power stations, battery stacks, and battery clusters. The present invention adopts a continuous non-linear function to transform the state of charge and depth of discharge value of the power station, battery stack, battery cluster and other units that need to be balanced, and then according to the transformed state of charge or depth of discharge, the The active power command of the equalization unit is given sequentially and proportionally. The present invention provides a unified SoC equalization strategy for the hierarchical energy storage system. By selecting an appropriate continuous nonlinear function, the equalization process can be ensured to be stable and fast, and the usability of the energy storage system and the friendliness of grid connection can be increased to the greatest extent. Quick plug and play.

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 method and system for multi-level state-of-charge balance and unified control of 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 it is one of the key technologies to realize my country's energy transformation and the goal of "carbon neutrality" in 2060. 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 energy comprehensive utilization efficiency can be improved, which has significant comprehensive benefits. In addition, the electrochemical energy storage system can achieve fast power conversion within milliseconds, which has huge advanta...

Claims

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Application Information

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Patent Type & Authority Patents(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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