Grid-Connected Three-Phase 3L-T-type qZS Inverter for Renewable Energy

In this article a power flow control strategy based on proportional-resonant current controller in a three-phase 3L-T-type qZSI connected to the grid to regulate the active power flow exchanged with the main grid is analyzed. This topology is quite promising in renewable energy application as the photovoltaic systems. The different components of the system are described and calculated as well as the control strategy, the current control loop based on αβ stationary reference frame and the special modulation method which includes alternating shoot-through states between upper and lower impedance networks. Simulation results illustrate and validate the proposed solution.