Power Quality Enhancement of PV System Based on Modified Three-Phase Cascaded Multilevel Inverter

Abstract

To enhance the power quality system, this study provides a three-phase modified seven-level cascaded H-bridge converter for grid-connected photovoltaic (PV) applications. Due to dust and weather changes, there is a PV mismatch in the irradiation level. As a result, it is considered because each PV array may act as a distinct dc source for each h-bridge module, cascaded h-bridge multilevel inverters are better for solving this issue. A sequence of H-bridge cells, each coupled to a string of PV modules, make up the cascaded multilevel system. The selected control mechanism allows each dc-link voltage to be regulated individually, allowing each string of PV panels to follow the maximum power point. Low ripple sinusoidal-current waveforms with a power factor of approximately one are also produced. The topology offers several advantages over typical five-level topologies, such as decreased switching frequency and minor current ripple. Simulation results are shown for a variety of operational scenarios. The findings show that the recommended configuration delivers considerably improved power quality of PV system in terms of voltage and current rate compared with the traditional structure of cascaded H-bridge design.