Modeling and control of PV/Wind Microgrid

Abstract

Microgrids are becoming the de facto for future power system. This paper presents the modeling and control of PV/Wind 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 fed with PV array and wind turbine. The PV array and the wind turbine are variable nonlinear DC sources and hence 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 contains outer voltage control loop and inner current control loop while the second inverter contains only power control loop. The controller is tested through simulation where the PV array and the wind system produce different DC levels. The simulation results show that the power sharing is achieved.