Adaptive DC Link Voltage Controller in PV Grid Connected Under Two-Stage Transformerless Configuration

Photovoltaic energy is a very important renewable energy source. However, modern energy strategies are increasingly integrating the PV system into the grid. In the PV grid connected, energy improvement is a continuous process that includes maximizing PV power, regulating DC link voltage, compensating reactive power, and minimizing total harmonic distortion. In this paper, the two-stage configuration of the transformerless system is adopted for PV grid connections. In this configuration, it is aimed at improving the DC link voltage controller. Three controls can be compared, such as the conventional DC Link voltage controller, the back-stepping voltage controller, and the proposed DC Link voltage controller. These controls are tested in MATLAB/simulink in order to evaluate the performance of each one. The results show some advantage for the proposed control.