DESIGN AND SIMULATION OF A HYBRID ISOLATED DC MICROGRID

Hybrid microgrid is the key solution to energize the remote rural area. The microgrid system incorporates more than one Distributed Renewable Energy (DRE) sources to complement one another. This thesis paper proposes a hybrid DC microgrid system to be operated in the isolated mode. The proposed microgrid consists of a PMSG based Wind Turbine, PV array and Lead-acid battery as energy storage device. The Wind Turbine generator is connected to the DC bus through a Three-phase Diode Bridge Rectifier. The PV array is tied to the DC bus by a Boost converter and incremental conductance algorithm is used to extract the maximum power from the PV array. The battery uses a bidirectional converter for the charging and the discharging. A simple PI based closed-loop control system is incorporated for proper energy management. The bus voltage is maintained either by the boost converter or the bidirectional converter depending upon the operating condition.