In certain cases, the application of traditional measurement techniques and related procedures for supercapacitor parameter extraction in time‐domain could be an unnecessarily time‐consuming process, which also requires different sets of measurement equipment, commonly expensive. This is a strong motivation for the development of procedures for supercapacitor parameter extraction which complies with the above. One such is presented in this paper. This paper presents a model of supercapacitors based on two parallel RC branches, respectively, as a second‐order system described by four parameters. In this paper, we will show that even a very simple second‐order model credibly describes a supercapacitor in a dynamic regime of a rapid discharging process. Also, we proposed an improved set of expressions that establish the relations between the supercapacitor parameters and measured quantities as well as the procedure for parameter extraction in time domain. We demonstrated that using a generalised least square method and the provided set of analytical expressions is a powerful and effective tool in supercapacitor parameter extraction from the waveform of supercapacitor current in rapid discharge regime. The validity of the proposed approach, expressions, and obtained parameters was confirmed by comparing the waveforms of short‐circuit current obtained by an experiment and a simulation.

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二阶超级电容器模型及其参数提取

在某些情况下，将传统的测量技术和相关程序应用于时域中的超级电容器参数提取可能是不必要的耗时过程，这也需要不同的测量设备集，通常很昂贵。这是开发符合上述要求的超级电容器参数提取程序的强大动力。本文介绍了一种这样的方法。本文分别提出了一个基于两个并行RC分支的超级电容器模型，作为一个由四个参数描述的二阶系统。在本文中，我们将证明，即使是非常简单的二阶模型也可以可靠地描述动态放电过程中快速放电过程中的超级电容器。也，我们提出了一套改进的表达式，建立了超级电容器参数与测量量之间的关系以及时域中参数提取的过程。我们证明了使用广义最小二乘法和所提供的一组解析表达式是从快速放电状态下的超级电容器电流波形提取超级电容器参数的强大而有效的工具。通过比较实验和仿真获得的短路电流波形，证实了所提出方法，表达式和所获得参数的有效性。我们证明了使用广义最小二乘法和所提供的一组解析表达式是从快速放电状态下的超级电容器电流波形提取超级电容器参数的强大而有效的工具。通过比较实验和仿真获得的短路电流波形，证实了所提出方法，表达式和所获得参数的有效性。我们证明了使用广义最小二乘法和所提供的一组解析表达式是从快速放电状态下的超级电容器电流波形提取超级电容器参数的强大而有效的工具。通过比较实验和仿真获得的短路电流波形，证实了所提方法，表达式和所获得参数的有效性。