Modelling and Control of Photovoltaic-Based Microgrid

Abstract

This paper presents the modelling and control of PV-based Microgrid. Renewable energy sources such as PV, wind and fuel cells are usually connected through voltage-source inverters. In order to share the same loads these inverters are connected in parallel to form a Microgrid. The system considered in the paper consists of two parallel inverters each fed with PV array. As the PV array is variable nonlinear DC source the control system should achieve good power sharing even with this imperfections. The controller is designed in the dq reference frame where the Space Vector Pulse Width Modulation is used. The first inverter controller contains outer voltage control loop and inner current control loop while the second inverter controller contains only power control loop. The controller is tested through simulation where each inverter is fed through PV array with different radiation level. The simulation results show that the power sharing is achieved even when the DC sources are different and nonlinear.