Emulation of Grid-Following Inverters for Impedance-Based Stability Analysis regarding Outer Control Loops

2021 56th International Universities Power Engineering Conference (UPEC) Pub Date : 2021-08-31 DOI:10.1109/UPEC50034.2021.9548176

C. Hirsching, W. Schulze, Maurizio Zajadatz, M. Suriyah, T. Leibfried

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Abstract

With an increasing share of converter based devices in power grids, numerous investigations on the overall system stability have been tackled in recent years to understand their interplay with the existing grid. Here, impedance based studies enable screening studies over a broad frequency range. Whereas interaction studies considering a grid impedance only represent a snapshot of the system, passivity studies enable classification of several sensitivities with respect to the damping behaviour of the considered device. Therefore, a test setup is proposed within this contribution to analyse the frequency-dependent characteristic of a converter at its output terminal up to 10 kHz. Hence, the behaviour of an arbitrary voltage source converter with an arbitrary controller implementation is replicated by a converter emulation setup. Utilizing the introduced test setup, the impedance characteristic related to different controller structures and operation points are received and evaluated.

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基于阻抗的电网跟踪逆变器外控制环稳定性分析仿真

随着电网中基于变换器的设备的份额越来越大，近年来人们对整个系统稳定性进行了大量研究，以了解它们与现有电网的相互作用。在这里，阻抗为基础的研究使筛选研究在广泛的频率范围。考虑网格阻抗的相互作用研究只代表系统的一个快照，而无源性研究可以根据所考虑的设备的阻尼行为对几个灵敏度进行分类。因此，在此贡献中提出了一个测试装置，以分析转换器在其输出端高达10khz的频率相关特性。因此，具有任意控制器实现的任意电压源转换器的行为可由转换器仿真设置复制。利用所介绍的测试装置，接收并评估了与不同控制器结构和工作点相关的阻抗特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2021 56th International Universities Power Engineering Conference (UPEC)

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