Aiming at the problem of three-bridge-arm double capacitive SVG compensation accuracy in three-phase four-wire system,its model is analysed. A self adaptive enhanced phase-lock-loop(EPLL)is suggested in which the phase follow is not affected by the unbalance voltage and is of good Robust stability and high accuracy. In order to overcome the shortcomings of resonance peak, high power loss and lower filtering efficiency in traditional LCL filter, a LCL filtering method with RC in series is designed to be appl...
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