Simulation research on PV grid-connected dynamic modeling based on MMC

Traditional three-level inverter circuit has the disadvantage of high harmonic content, thus the modular multilevel circuit is proposed for the realization of PV grid-connected inverter function based on analyzing the operating principles of modular multilevel converter (MMC). The maximum power point tracking (MPPT) was realized by using the tracking differentiator and the decoupling control of the inverter AC side by PQ control strategy. Photovoltaic was grid-connected for unit power factor andhe dynamic model of photovoltaic grid-connected system was established in PSCAD. The simulation results show that the proposed model has the advantages of low switching loss and low current harmonics.