SOC online estimation method based on parameters of all-vanadium flow battery model

Abstract

The invention provides a SOC online estimation method based on an all-vanadium flow battery mathematical model and relates to the technical field of battery management. The method mainly comprises thesteps of (1) obtaining estimation parameters and measuring terminal voltage U0, terminal current I0 and pump loss Ipump of three groups of all-vanadium flow batteries in an operation process to obtain three sets of estimation parameters, (2) introducing the parameters obtained in step (1) into a mathematical expression of the all-vanadium flow battery equivalent circuit model E-U0p- (Ipump+I0)R1=U0 and calculating open circuit voltage E, equivalent internal resistance R1 and external parasitic loss equivalent resistance R2 of an all-vanadium flow battery, and (3) introducing data obtained instep (2) into the follow formula E=N*[1.219+0.11841g(1-1 / SOC)], and calculating and obtaining an SOC value according to the formula. According to the method, the separate adding of one single batteryto detect the open circuit voltage of the all-vanadium flow battery is not needed, the open circuit voltage is calculated by using the all-vanadium flow battery equivalent circuit model, the cost of an all-vanadium flow battery system is saved, and the implementation is easy.

Description

technical field [0001] The present invention relates to the technical field of battery management, and more specifically, relates to an SOC online estimation method based on model parameters of an all-vanadium redox flow battery. Background technique [0002] The reserves of non-renewable energy such as coal, oil, and natural gas are decreasing day by day, and the large-scale use of fossil energy has caused a series of environmental pollution and destruction problems. Renewable energy sources such as wind energy and solar energy have the advantages of wide sources, clean and pollution-free, and the development of new energy sources such as wind energy and solar energy has attracted the attention of countries all over the world. However, the random fluctuation characteristics and intermittency of light and wind speed lead to large fluctuations in the output power of distributed energy generation, which has a large impact on the power grid and affects the stability of power gr...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art, and provides a kind of SOC online estimation method based on all-vanadium redox flow battery model parameter, to solve problems such as measurement system complexity in the prior art, increased additional investment cost

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