Enhanced Power Quality Multi-Mode Grid Interactive PV-Battery System for Uninterrupted Power

Abstract

A grid-interactive photovoltaic array (PVA) system with multiple operating modes, is demonstrated in this work. The system prioritizes interruption free power supply to the local loads. The combination of single phase and three phase local loads, is considered. In line with the modern trend, the nonlinear loads are taken. At healthy grid conditions, the remaining power, after feeding the local loads, is dispatched to the grid. At PVA power shortage, the grid meets the deficit power. The sensitive loads are unaffected by the grid abnormalities, due to the swift switchover to an islanded mode. The inclusion of battery storage provides the dual benefits of optimum PVA power harvesting, and backup supply to the loads. The on-line grid resynchronization is achieved without disruption to the loads. The PVA interaction is controlled by a boost converter. The control structure ensures swift action at load changes and PVA power fluctuations. Moreover, the improved grid power quality, and suppressed neutral currents, are managed by the system.