Single-Phase H6 Inverter with Hybrid Modulation Scheme for Solar PV application

Abstract

Because of their great efficiency, inexpensive, and compact size, and transformer-less photovoltaic (PV) inverters are becoming increasingly popular. Active power injection with no leakage current is now possible because to new layouts and modulating approaches. Reactive power injection by PV inverters into the utility grid is now required under some new grid standards. To gauge the degree of difficulty, a new hybrid modulation approach is devised and tested on a non-isolated H6 topology. With relatively slight alterations to variable reactive power generation with minimum crossing distortions can be achieved using switching patterns and a phase shift in the reference current and avoid common mode voltage. In-depth explanations of the various modes of operation and design considerations for the new hybrid modulation approach are provided. A 4kVA prototype and the SMPLIS simulation provide ample evidence to back up the proposed hybrid modulation strategy.