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Phase-locked loop (PLL) technique is widely used for synchronization applications. A variety of moving average filter (MAF)-based PLLs have been presented in recently published literatures. MAF-based PLL can completely eliminate the effect of unbalanced voltage, characteristic harmonics, and dc offset. Unfortunately, the open-loop bandwidth is drastically reduced after incorporating MAF into the PLL...
Grid synchronization is one of the most important issues of the distributed power generation system (DPGS) connected to utility network. This paper proposes a novel phase-locked loop (PLL) for synchronization of power electronic converters in unbalanced and variable-frequency environments. The method utilizes double rotating reference frames to transform the input signal and detects the positive fundamental...
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