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摘要
Aiming at the traditional second-order generalized integrator based frequency locked-loop has insufficient anti-DC interference ability, an improved SOGI-FLL design scheme considering DC offset suppression is proposed in this paper. Firstly, the structure of SOGI-FLL is briefly introduced, and then, the effects of DC component in input signal on the frequency locking output signal and the orthogonal signal of SOGI-FLL on the mid-beta (3 axis component are analyzed. The structure of SOGI-FLL is improved by adding a new low-pass filter channel, and the transfer function is derived from the structure of frequency locked-loop to analyze the frequency characteristics, which verifies the effectiveness of the improved scheme. Finally, PSCAD simulation software is adopted in the power grid environment with DC component, and the correctness of the designed scheme is verified by setting up groups of SOGI-FLL and ESOGI-FLL comparative experiments. ? 2020 Harbin Jinhe Electrical Measurement & Instrumentation Magazine Publishing Co., Ltd..
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