Novel direct power control of single-phase three-level SVPWM inverter for photovoltaic generation

In order to get the desired output from photovoltaic (PV) generation, it is necessary to control the power exchange with the grid. Therefore, the calculations of real and reactive power for PV inverters are important. In this study, a novel direct power control (DPC) strategy for three-level single-phase grid-connected SVPWM inverters has been developed. In this strategy, the real and reactive power control and SVPWM are considered in inner loop, while a voltage PI controller is used in outer loop to acquire constant output voltage and provide power reference to the DPC. In addition, the MPPT algorithm is integrated into the control strategy to get the maximum PV output. The performance of the proposed method is verified by simulation results obtained using Matlab/Simulink.