Multiple-Integrated Converters for Grid-Connected PV Systems with Intermediate DC Loads

The centralized grid-connected PV systems have a serious drawback of insolation mismatch among the PV modules when a partial shadow occurs. To overcome this limitation, a decentralized grid connected PV system with multiple integrated converters(MIC) sharing a common grid connected inverter and intermediate dc loads connected through battery is proposed. The proposed multiple integrated converters are incorporated with individual MPPT controllers to track maximum power from the respective PV modules. It also increases power conversion efficiency during partial shadows when there is an insolation mismatch between the modules. The DC loads can be connected through the battery and the excess available power is supplied to the grid. The proposed configuration is simulated for various insolations and temperatures and the simulation results are presented.