Research on Stability of lnverter with Fuzzy Digital Locked Loop

The implementation of three-phase grid-connected inverter provides a feasible solution for energy problems. In this paper, the impedance analysis is adopted to analyze the inverter and the power grid respectively. The Synchronous Reference Frame phase-locked Loop (SRF-PLL) parameters are implemented, and the d-q axis directional models using the fuzzy parameter Phase-Locked Loop (PLL) are deduced. The effects of strong electricity, weak current and DC input on the output of three-phase system are compared, and whether fuzzy control can optimize the output results is discussed, finally, the relationship between input frequency, input voltage, and output current is simulated. The results of simulation show that fuzzy control can improve the stability of the inverter and make the system more stable under certain conditions.