A Novel Multi-loop Control Strategy for PWM Rectifier Based on LCL Filter
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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