This paper presents an identification methodology for filter circuits of commercially available power electronic devices based on laboratory measurements. The filter circuit is one of the main components with significant impact on the harmonic behaviour, in particular for modern power electronic devices. The generic approach does not require detailed knowledge about the circuit layout and is applicable for all single-phase power electronic devices where a voltage measurement on both sides of the filter circuit is possible. Current measurements on the circuit board, which are usually not practicable, are not required. The model parameters of the filter circuit are represented by two admittances for each considered frequency. The parameter identification is based on the analysis of the frequency couplings of power electronic devices. The proposed method is validated by simulations and exemplarily applied for a commercially available photovoltaic (PV) inverter in the laboratory. The measurement-based parameter identification can also provide more reliable results compared to the white-box simulation of a particular device, as the partly large manufacturing tolerances of the elements are inherently considered in the measurements.

本文提出了一种基于实验室测量的商用电力电子设备滤波器电路的识别方法。滤波器电路是对谐波行为有重大影响的主要组件之一，特别是对于现代电力电子设备。通用方法不需要有关电路布局的详细知识，适用于所有可以在滤波器电路两侧进行电压测量的单相电力电子设备。不需要在电路板上测量通常不可行的电流。对于每个考虑的频率，滤波器电路的模型参数由两个导纳表示。参数识别基于对电力电子设备频率耦合的分析。所提出的方法通过模拟得到验证，并示例性地应用于实验室中市售的光伏 (PV) 逆变器。与特定设备的白盒模拟相比，基于测量的参数识别还可以提供更可靠的结果，因为在测量中固有地考虑了元件的部分大制造公差。