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Energy Internet energy storage system lithium battery SOC state estimation method

An energy Internet and energy storage system technology, which is applied in the field of SOC state estimation of lithium batteries in energy Internet energy storage systems, and can solve problems such as difficulty in SOC state estimation.

Active Publication Date: 2019-08-02
深圳昱泽新能源有限公司
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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 working state of the battery, such as voltage, current, internal resistance, temperature, etc., so that its SOC State estimation is more difficult

Method used

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  • Energy Internet energy storage system lithium battery SOC state estimation method
  • Energy Internet energy storage system lithium battery SOC state estimation method
  • Energy Internet energy storage system lithium battery SOC state estimation method

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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 an energy Internet energy storage system lithium battery SOC state estimation method. The method comprises the following steps of firstly, constructing a physical model of anenergy Internet energy storage system lithium battery, combining a T-S fuzzy model method and a singular system method to express a dynamic state of a nonlinear system; then, for the energy Internet lithium battery system, designing a fuzzy observer to estimate a state of charge (SOC) of the lithium battery; and then, based on that, further designing a fuzzy controller based on the observer to ensure stability of a closed-loop control system. In the method, a real work condition is considered, and because of the designed fuzzy observer and the fuzzy controller, a system can be operated 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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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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