Multi-level Transformerless PV inverter Based Real and Reactive Power Injection for Single Phase System

Abstract

The grid connected Photovoltaic (PV) inverters are used to generate and inject real power to the grid. The main concerns of grid connected PV inverters are efficiency and harmonic contents due to oscillations in dc link voltage due to Maximum Power Point Tracking (MPPT) under clouded conditions. In this paper, we are using transformerless PV inverter, so that the size and cost as well as the losses can be minimized. For this new transformerless multilevel inverter is proposed in this paper with seven levels with eight switches. This inverter provides zero common mode leakage current and also capable of injecting both real and reactive power. Simulation work is carried out for seven level proposed inverter topologies in MATLAB/Simulink software which determines its maximum power point tracking performance.