Method for estimating maximum available power of supercapacitor

Abstract

The invention discloses a method for estimating the maximum available power of a supercapacitor. The method for estimating the maximum available power of the supercapacitor comprises the following steps that partial working condition test data of the supercapacitor are obtained; model characteristic parameter data under partial working conditions are obtained by using a parameter identification method; model characteristic parameters in the whole working condition range are estimated by a support vector machine method, and a comparison table of full working condition model characteristic parameters is established; whether the lifetime state of the supercapacitor is attenuated or not is judged; the maximum allowable discharge current value under a current working condition is determined; anelectromotive force after delta<t> time is estimated and used as a maximum power discharge electromotive force; and the maximum available power of the supercapacitor is calculated. According to the method for estimating the maximum available power of the supercapacitor, the influence of factors such as lifetime, temperature and current multiplying power on the parameters of a supercapacitor modelis considered, the accuracy of the EMF prediction is improved, and the accuracy of the maximum available power estimation is further improved. Meanwhile, the method for estimating the maximum available power of the supercapacitor is applicable to high-precision available power estimation under different dynamic conditions.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a method for estimating the maximum available power of a supercapacitor. Background technique [0002] As the core basic components (components) of my country's industrial strong foundation engineering, supercapacitors have the outstanding advantages of high power density, fast charge and discharge speed, wide operating temperature range, and long cycle life. They are very suitable for large-scale energy storage applications. In recent years develop rapidly. It has broad application prospects in various fields under the framework of the Energy Internet, such as energy storage and voltage compensation of renewable energy access systems, urban rail transit braking energy recovery and utilization, new energy vehicle power systems, elevator backup power supplies, etc. The application has obvious advantages and is a research hotspot in the field of new energy. [0003] Superc...

AI Technical Summary

Problems solved by technology

[0005] Through the above analysis, it can be seen that the key problem of estimating the maximum available power of supercapacitors is: under the current working state, predict the working conditions of the short-term maximum available power in the future

At present, the commonly used supercapacitor maximum available power prediction method is generally based on the internal resistance of the supercapacitor, and assumes that the internal resistance of the supercapacitor is a constant value, ignoring the influence of the internal resistance of the supercapacitor on temperature, life, current and other factors, resulting in large prediction errors

Although some methods take into account the influence of parameter changes, they require a lot of testing and calculation costs, which is not conducive to engineering applications

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