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Active Damping of Capacitor Current Based on Parallel Feedforward Compensation of LCL Grid Connected Inverter

An active damping (AD) of filter capacitor current for LCL single phase grid connected inverter (GCI) is introduced. In suggested method, a damping coefficient is added across the LCL filter system and feedback capacitor current at reference voltage point to form a damping loop. This configuration is known as the Parallel Feedforward Compensation (PFC) method. It has fast dynamic response and relatively convenient tuning procedure as compared to capacitor current proportionally feedback method. The grid current regulation is achieved by Proportional Resonant (PR) control implementation. The effect of damping coefficient and stability characteristics of current control loop under LCL filter parameter variation is analyzed with suggested methodology. Finally, the effectiveness of suggested methodology is examined in MATLAB environment and verified by simulation results.