基于可变电阻的超级电容精确建模方法

Accurate Modeling of Supercapacitor Based on Variable Resistor

超级电容应用越来越广泛,精确的模型可以真实的反映实际应用场合的信息,给用户的使用提供依据。然而传统的模型忽略了等效电路模型中各个参数和充放电电流的关系,所以模型精确度较低。提出将等效电路模型中的一个常电阻扩展为一个随电流变化的可变电阻的模型。通过多种倍率的充放电实验获取建模所需的实验数据,使用Parameter Estimation工具辨识出模型的各个参数值。采用多项式拟合的方法精确可变电阻的动态值。结果表明,无论是在大电流、小电流下,还是大小电流切换的瞬间,扩展的超级电容模型动态特性更加准确。

Supercapacitor is widely in many applications,and accurate models will reflect the information just like the real situation of the practical application and provide a basis to users. However,the relationship between each parameter and the charge and discharge currents is ignoring in the traditional modeling. So the accuracy of the model is lower. This paper presents an extended model in which the constant resistance is replaced by a variable resistor with the current changes. The experimental data was obtained by a charge and discharge experiment,and the Parameter Estimation was used to identify the values of the model parameters. The dynamic value of the variable resistor was got in polynomial fitting method. The results showed that characteristics of the extended dynamic supercapacitor model was more accurate.