A General Graphical Method for Filter-Based Active Damping: Evaluation, Exploration, and Design
IEEE Journal of Emerging and Selected Topics in Power Electronics（2023）
摘要
Filter-based active damping is a promising solution to tackle the resonance hazard of
LCL
-filtered inverters. Although various methods have been developed, it still lacks guidelines to evaluate and select them. In this article, a general graphical method is proposed to fill this void, and the desired phase regions of the damping filters for stabilization are identified. As a benchmark, the proposed method is used to evaluate the existing damping filters and further explore the proper ones on the robustness against the drift of
LCL
resonance frequency. It reveals that the low-pass filter (LPF), the all-pass filter (APF), the delay filter (DF), and the resonant-notch filter (NF) are less robust, and finds that the phase-lag filter (PLF), the NF with its notch frequency equaling one-third of the sampling frequency, the quasi-NF, and the bi-quad filter (BQF) are highly robust. Taking the PLF as an example, the design guideline of the filter parameters is presented according to the proposed method. Experiments tested on a 6-kW prototype validate the theoretical analysis.
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关键词
active damping,general graphical method,filter-based
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