A method for correcting supercapacitor soc estimation
A technology of supercapacitors and correction coefficients, which is applied in the direction of instruments, measuring electricity, and measuring electrical variables, etc., can solve problems such as aging, large difference in estimated values, and decreased calculation accuracy of the ampere-hour integral method, so as to eliminate errors and improve accuracy.
Inactive Publication Date: 2018-06-08
DALIAN UNIV OF TECH
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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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[0029] The specific embodiments of the present invention will be described in detail below in combination with the accompanying drawings and the technical solutions of the description.
[0030] First, in order to compensate the influence of supercapacitor capacity characteristics on SOC estimation, the current equivalent coefficient is introduced. The relationship between constant discharge current and continuous discharge time for supercapacitors
[0031] I n t = Const (5)
[0032] Among them, I is the constant current discharge current value; t is the time for the fully charged supercapacitor to discharge continuously to the cut-off voltage; n is a constant related to the type of supercapacitor, and Const represents a constant related to the active material of the supercapacitor. due to Q i =It can represent the available capacity of supercapacitor under constant current I discharge condition, it is substituted into formula (5) and transformation can obtain:
[0033] Q ...
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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 (State Of Charge; 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...
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 张莉张昊然时洪雷
Owner DALIAN UNIV OF TECH