Comparison of the Improved Control of Three-Phase Two-Level and Multi-level Inverters with Sinusoidal (SPWM) and Space Vector (SVPWM) Control for Grid-Connected Photovoltaic Systems (PV)

Abstract

This article is a proposal toward improved control of the three-phase two-level and multi-level photovoltaic inverter with two new control methods, by the sinusoidal (SPWM) and space vector (SVPWM) control for a nonlinear load. The contribution of this study concerns the strategies of control of the active and reactive power injected by this inverter in the grid in order to improve the losses of harmonics current in the grid. The main objective of this method is to respond to the problems encountered with the photovoltaic inverter to effectively filter the harmonics of the current. After comparing the results of the two systems, our findings suggest that the current THDi of the interlaced (multi-level) inverter is lower than that obtained with the two-level inverter, provide higher-quality waveforms, reducing current and losses caused by high-frequency harmonics. The simulation results demonstrate the effectiveness of these propose techniques in this work.