Abstract
The capacitor current feedback active damping (CCFAD) is preferred to dampen the resonance and assure stability in the grid current control of the LCL grid connected inverter (LCL-GCI). However, the digital realization of proportional CCFAD restricts the virtual positive resistance region (VPRR) up to one-sixth of the sampling frequency. Theoretically, including a phase lead compensator (PLC) in the capacitor current feedback path can augment the VPRR to one-third of the sampling frequency. The astute methodology for realizing the active damping is to design PLC in the continuous domain before executing in a discrete environment. Nevertheless, the discrete realization face issues of errors in gain and phase; hence discrepancies between theoretical and real-time simulation results may arise. This article compares different discretization methods for the PLC and demonstrates their impact on the VPRR of CCFAD based LCL-GCI operation. The pre-warped Tustin discretization rule is observed as the best way to retain the PLC's gain and phase characteristics at the VPRR boundary. The real-time simulation results are presented to prove the effectiveness of the theoretical analysis.
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