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This paper presents a new family of fuzzy phase locked loop (FPLL)-fuzzy double decouple synchronous reference frame phase locked loop (FDDSRF-PLL)-that incorporated DDSRF-PLL into FPLL. FDDSRF-PLL enjoys both advantageous of DDSRF-PLL and fuzzy system to detect the fundamental-frequency positive-sequence component of the utility voltage under unbalanced and distorted conditions as well as fast and...
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