Analysis and Simulation of Transient Response of MAF-PLL with PLC

Phase-locked loop (PLL) is a vital technique for grid-connected inverters to achieve synchronization, and is requested to detect accurately the frequency and phase when inverters are synchronized. Moving average filter PLL (MAF-PLL) improves the filtering capability of synchronous reference frame PLL (SRF-PLL), but causes a phase delay of 180° in the PLL control loop, which affects the transient performance of MAF-PLL. To improve the transient response of the MAF-PLL, a phase-lead compensator (PLC) is cascaded in the MAF-PLL control loop to overcome shortcoming of MAF-PLL. The effectiveness of the proposed PLL is verified by simulation and numerical analysis.