Method for correcting supercapacitor SOC estimation

Abstract

The invention discloses a method for correcting supercapacitor SOC estimation, and belongs to the technical field of energy storage techniques.The method comprises the steps that a current equivalent coefficient k, a capacitor health state correcting coefficient k<l> and a temperature compensation coefficient k<T> are introduced on the basis that an ampere-hour integral method and an open circuit voltage method are combined, an SOC initial value SOC (t0) is corrected, and then the precision of supercapacitor SOC estimation is improved.According to the method, the influences brought by the factors such as the current, cyclic aging and working temperature of a supercapacitor on SOC estimation are corrected, and by introducing the compensation coefficients, errors can be effectively eliminated; the influence brought by the initial value is eliminated by correcting the initial value SOC (t0), and the precision of SOC estimation can be further improved.

Description

technical field [0001] The invention provides a method for correcting the SOC estimation of a supercapacitor, which belongs to the technical field of energy storage. Background technique [0002] Supercapacitors have been widely utilized due to their advantages such as high power density, short charge-discharge time, long cycle life, and wide operating temperature range. The remaining capacity of the supercapacitor is also called the state of charge (StateOfCharge; SOC) of the supercapacitor, which is one of the important state parameters of the supercapacitor. Accurately estimating the remaining power of the supercapacitor so that it can work safely within a reasonable range is the guarantee for improving the energy utilization and working efficiency of the energy storage system. How to obtain the supercapacitor SOC value accurately and reliably is an important task of the supercapacitor bank management system. At present, the commonly used methods in China are the open c...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the estimated values ​​​​under different initial SOC values ​​​​are quite different, and when the supercapacitor is used for a long time, it will age, and the calculation accuracy of the ampere-hour integral method will also decrease.

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