Reactive power injection control methods for fault ride through capability in distributed generation

Decentralized and renewable energy sources are being very popularly used in the modern power system and have become very supportive and useful for the stabilization of the power system. In the past, decentralized and renewable energy sources were disconnected by utility companies during abnormal conditions such as faults and under voltage conditions. In the event of fault it was necessary to remove decentralized and renewable energy source so that such sources do not provide or contribute in increase of fault current. This paper shows the methods of reactive power injection by capacitor banks and use of IGBT based inverter with PI controller. By using these methods, decentralized and renewable energy sources can stay connected to the local network or grid, along with helping the system voltage to remain at 1.0 p.u. by injecting reactive power.