An on-line calibration method for SOC of all-vanadium redox flow battery based on capacity correction

Abstract

The invention provides an online calibration method for the SOC of an all-vanadium redox flow battery based on capacity correction, and relates to the technical field of SOC detection of all-vanadiumredox flow batteries and battery management. According to the invention, the method comprises the steps: determining the relation between the charging and discharging efficiency Eta and SOC of the all-vanadium redox flow battery (Eta=0.68125+0.1875*SOC<A(k-1)>), and obtaining a value (shown in the description), thereby achieving the improvement of an ampere-hour integration method and giving consideration to a condition that the attenuation of the battery capacity can affect the SOC detection precision in an actual operation process; calculating the SOC values of the battery at the same time through the ampere-hour integration method and an open circuit voltage method, proposing an equation (shown in the description) to achieve the correction of the battery capacity, and proposing an equation (shown in the description) to achieve the correction of the SOC of the all-vanadium redox flow battery, thereby improving the SOC detection precision of the all-vanadium redox flow battery, and facilitating the accurate charging and discharging control of a BMS (Battery Management System).

Description

technical field [0001] The method relates to the field of SOC detection technology of all-vanadium redox flow battery and battery management, and more specifically is an online SOC calibration method of all-vanadium redox flow battery based on capacity correction. 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 an...

AI Technical Summary

Problems solved by technology

It can be found that curve 3 is always above curve 2, that is, the SOC of the all-vanadium redox flow battery will change after the capacity decays. If the capacity is not corrected, the measured SOC value will be too small

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