Hybrid capacitor power state online estimation method and system

Abstract

The invention discloses a hybrid capacitor power state online estimation method and system, and belongs to the technical field of hybrid capacitor application. The method comprises the following steps: collecting a state-space equation according to a hybrid capacitor equivalent circuit model, and discretizing the state-space equation; carrying out working condition testing on the hybrid capacitor,collecting a voltage value and a current value of the hybrid capacitor, and recognizing parameters of the discretized state-space equation on line by utilizing a recursive augmented least square method with a forgetting factor; and estimating the instantaneous peak power and the continuous peak power of the hybrid capacitor by using the parameters obtained in real time. Compared with an offline power state estimation method, the hybrid capacitor power state online estimation method provided by the invention can realize online updating of model parameters and improve the precision of hybrid capacitor power state estimation.

Description

technical field [0001] The invention belongs to the technical field of application of hybrid capacitors, and more particularly relates to a method and system for online estimation of the power state of a hybrid capacitor. Background technique [0002] Inexpensive and efficient electrochemical energy storage is a key technology for the efficient use of renewable energy and the development of smart grids. As a newly developed class of advanced energy storage devices, hybrid capacitors have broad application prospects in smart grids, electric vehicles and other fields. One pole of the hybrid capacitor stores and converts energy through the electrochemical reaction of conventional battery electrodes, and the other pole stores energy through the adsorption / desorption mechanism of the electric double layer. The energy density of hybrid capacitors is 5 to 10 times higher than that of electric double layer capacitors, and at the same time, its power density and cycle life are highe...

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Problems solved by technology

[0006] In view of the defects of the prior art, the object of the present invention is to provide an effective method and system for online estimation of the power state of a hybrid capacitor in view of the fact that the existing power state estimation method has unsatisfactory practical application effects and is not suitable for hybrid capacitors. , adapt to the needs of practical applications, improve the reliability of the estimated results, and thus provide an important theoretical basis for the optimal matching of the dynamic performance of the hybrid capacitor and the optimization of the control strategy

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