In view of the defects of applying LCL filters in voltage source PWM rectifier(VSR),such as resonance and system instability,this paper presents a novel multi-loop control strategy and designs the control structure in synchronous coordinate system.The strategy belongs to active damping control,which introduces the filter capacitor current-loop feedback control on the basis of the traditional double-loop control system.The strategy increases the system equivalent damp which effectively inhibits the LCL filter resonance,thus ensures the system stability.The proposed strategy system has been simulated by using Matlab/Simulink,and the results verify its feasibility and effectiveness.
PWM rectifierLCL filtermulti-loop control structureactive damping control
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