Research on Photovoltaic Grid-Connected Converter with Nine-Level Injection Voltage Source

In a high-power photovoltaic (PV) grid-connected system, a nine-level injected voltage source converter facilitates efficient power conversion and grid-connected application through the utilization of a 12-pulse wave conversion circuit and voltage injection technology. A modular PV direct current (DC)boosting and pooling system is constructed by combining the maximum power tracking control strategy with the nine-level injected converter PV grid-connected system. The integrated control strategy of the latter is explored with the objective of achieving a reasonable realization of the voltage injection features and a smooth grid-connection of the PV power generation system power. Ultimately, PSCAD is employed to construct the simulation model. The results demonstrate that the developed integrated control strategy for a nine-level injected voltage source converter can guarantee the safe and reliable operation of the injected converter PV grid-connected system.