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Phase locked loop(PLL) is one of the key techniques in the grid connection system of permanent-magnet synchronous motor(PMSM). Different types of the PLL are analyzed and compared. In order to overcome the traditional PLL shortcomings, an improved decoupled double synchronous reference frame software phase locked loop(DDSRF_SPLL) is proposed. This PLL is based on least error square filter(LES) and...
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