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This paper proposes a phase-locked loop (PLL) structure, which is composed of non-autonomous adaptive filters (AFs) and a positive sequence detector (PSD), both operating in conjunction with the PLL based on synchronous reference frame (SRF-PLL). The AFs are used to extract the fundamental components of the utility voltages, whereas the PSD extracts the positive sequence components at fundamental...
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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