A Supercapacitor State of Charge Estimation Method Based on Dynamic Capacitance Correction

Abstract

The invention discloses a dynamic capacitance correction-based supercapacitor charge state estimation method. The method comprises the steps of S10, periodically detecting the temperature, the voltage and the current of a supercapacitor; S20, judging whether the charge redistribution of the supercapacitor occurs or not; S30, identifying the real-time parameters of the supercapacitor according to the detected voltage and the detected current, and calculating the real-time electromotive force of the supercapacitor according to the identified real-time parameters of the supercapacitor; S40, performing the normalization treatment on the real-time electromotive force within the safe working interval of the supercapacitor to serve as an SOC preliminary estimation value; S50, correcting the obtained SOC preliminary estimation value based on a dynamic capacitance value so as to obtain a final SOC estimated value and outputting the final SOC estimated value. According to the method, the SOC of the supercapacitor is estimated by utilizing the real-time electromotive force. In this way, not only the defect of the accumulative error of the ampere-hour integral method is avoided, but also the standing time of the open-circuit voltage method is not needed. The real-time performance and the accuracy of estimation are improved.

Description

technical field [0001] The present invention relates to the technical field of a method for estimating the state of charge of a supercapacitor, in particular to a method for estimating a state of charge of a supercapacitor based on dynamic capacitance correction. Background technique [0002] Based on the surface phenomenon of ion adsorption, supercapacitors complete the charging and discharging process at the electrode-electrolyte interface. It is an energy storage device between electrolytic capacitors and traditional batteries. The electrostatic energy storage principle involved does not destroy chemical bonds and the process is stable. Supercapacitors have the advantages of high power density, fast charge and discharge speed, wide operating temperature range and long cycle life, and are suitable for rapid storage and release of energy. Therefore, in the field of large-scale energy storage such as energy storage and voltage compensation in renewable energy access, urban r...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: Aiming at the problems that the existing supercapacitor SOC estimation method has large errors and cannot be estimated in real time, it provides a dynamic capacitance-based supercapacitor with high precision and simple calculation process that can realize real-time estimation. Modified Supercapacitor State of Charge Estimation Method

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