Simple and Effective Algorithm for Battery Assisted Quasi Z-Source Inverter for Standalone PV-Pumping Systems

Abstract

A QZSI with an energy storage system is developed for standalone applications. A controller based on the battery-assisted Quasi Z-Source Inverter model is designed to achieve both MPPT from the solar panels and to control the battery State of Charge (SOC). The control strategy will control both MPPT and Battery SOC through the shoot-through duty ratio (D) and Modulation index of the inverter (M). The simple boost modulation technique is adopted for the inverter switching strategy. The performance of the designed system is verified using simulation.