Research on Control Strategy of Three Phase T-type Three Level Photovoltaic Grid-connected Inverter

The control strategy of three-phase three-level T-type converter is the key technology to ensure safe and stable operation of photovoltaic (PV) grid-connected power generation systems. In order to solve the complex problem of proportional resonance controller design in traditional stationary coordinate system, an improved control strategy was proposed in stationary coordinate system. The topology structure and basic working principle of three-phase three-level T-type converter were studied. The equivalent mechanism of control strategies was analyzed in stationary coordinate system and synchronous coordinate system. The control block diagram of the proposed control strategy was given. Finally, the simulation platform of three-phase three-level T-type photovoltaic grid-connected inverter was built by Matlab/Simulink simulation software, and the simulation research of the proposed control strategy was carried out. The simulation results verify the effectiveness and feasibility of the proposed control strategy.