Hybrid capacitor equivalent circuit model and online parameter recognition method

Abstract

The invention discloses a hybrid capacitor equivalent circuit model and an online parameter recognition method, and belongs to the technical field of hybrid capacitor application. Wherein the model comprises a variable capacitor, an ohmic internal resistor and n RC circuits, each RC circuit comprises a resistor Ri and a capacitor Ci, and obtaining a state space equation of the n-order multi-modelfused equivalent circuit model. According to the multi-model fusion equivalent circuit model of the hybrid capacitor constructed by the invention, the characteristics of the battery and the electric double-layer capacitor are combined, and the external characteristics of the hybrid capacitor can be better represented. Compared with a traditional capacitor equivalent circuit model, the model can effectively improve the simulation precision of the hybrid capacitor; compared with an electrochemical model, the model is simple in structure and high in calculation efficiency in practical application.

Description

technical field [0001] The invention belongs to the technical field of hybrid capacitor applications, and more specifically relates to an equivalent circuit model of a hybrid capacitor and an online parameter identification method. Background technique [0002] Currently, supercapacitors can be broadly classified into electric double layer capacitors, hybrid capacitors, and pseudocapacitors. As an energy storage device with dual electrochemical reaction mechanisms of batteries and electric double layer capacitors, hybrid capacitors have higher power density and longer cycle life than batteries, and higher energy density than electric double layer capacitors. It can better meet the overall requirements for power density and power density in practical applications, and has broad application prospects in smart grids, electric vehicles and other fields. [0003] The establishment of the hybrid capacitor model is of great significance for the study of its characteristics, state ...

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Problems solved by technology

[0006] Aiming at the defects of the prior art, the purpose of the present invention is to provide an equivalent circuit model of a hybrid capacitor and an online parameter identification method, which combines the characteristics of batteries and electric double-layer capacitors, and aims to solve the problem that traditional capacitor models cannot be well represented. The problem of the external characteristics of hybrid capacitors, so as to improve the model accuracy of hybrid capacitors in the whole life cycle, and lay the foundation for hybrid capacitor state estimation and integrated management

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