A method for estimating the SOC state of a lithium battery in an energy Internet energy storage system

A technology of energy internet and state estimation, which is applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., and can solve problems such as difficulty in SOC state estimation.

Active Publication Date: 2021-12-03
深圳昱泽新能源有限公司
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AI Technical Summary

Problems solved by technology

Battery state of charge estimation is the core function of the battery management system. Since SOC is a physical quantity that cannot be directly measured, it can only be estimated by information related to the battery working state, such as voltage, current, internal resistance, temperature, etc., so that its SOC State estimation is more difficult

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  • A method for estimating the SOC state of a lithium battery in an energy Internet energy storage system
  • A method for estimating the SOC state of a lithium battery in an energy Internet energy storage system
  • A method for estimating the SOC state of a lithium battery in an energy Internet energy storage system

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Embodiment Construction

[0083] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0084] The present invention provides a method for estimating the SOC state of a lithium battery in an Energy Internet energy storage system, comprising the following steps,

[0085] Step S1. Build an Energy Internet energy storage lithium battery system, such as figure 1 As shown, the Energy Internet lithium battery system 100 includes an Energy Internet AC bus 10, a bidirectional DC / AC module 20, a lithium battery 30, a fuzzy observer 40, and a fuzzy controller 50;

[0086] Step S2, according to the physical principle and the expression method of the T-S fuzzy model, establish the lithium battery system model of the Energy Internet;

[0087] Step S3, designing a SOC fuzzy observer for the SOC operation state problem of the energy Internet lithium battery to estimate the SOC;

[0088] Step S4, based on the designed SOC fuzzy observer, ...

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Abstract

The invention relates to a method for estimating the SOC state of a lithium battery in an energy Internet energy storage system. First, build the physical model of the lithium battery of the Energy Internet energy storage system, and combine the T-S fuzzy model method and the singular system method to express the dynamics of the nonlinear system; then, for the Energy Internet lithium battery system, design a fuzzy observer to charge the lithium battery The state of state (SOC) is estimated; on this basis, a fuzzy controller based on an observer is further designed to ensure the stability of the closed-loop control system. The method of the invention considers real working conditions, and the designed fuzzy observer and fuzzy controller make the system run stably.

Description

technical field [0001] The invention relates to a method for estimating the SOC state of a lithium battery in an energy Internet energy storage system. Background technique [0002] In order to accurately estimate the state of charge of the battery under different conditions, a suitable model must be established to describe the battery characteristics. Battery state of charge estimation is the core function of the battery management system. Since SOC is a physical quantity that cannot be directly measured, it can only be estimated by information related to the battery working state, such as voltage, current, internal resistance, temperature, etc., so that its SOC State estimation appears to be more difficult. [0003] Lithium batteries are very suitable for the energy storage system application of the Energy Internet due to their excellent performance such as safety and pollution-free. Accurate estimation of the state of charge (SOC) is of great significance for improving t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/387
CPCG01R31/387
Inventor 汪星一钟智雄伍文才黄伟雄傅珊珊
Owner 深圳昱泽新能源有限公司
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