Fast Control Strategy For Stabilizing Fixed Speed Wind Turbines in an Islanded Distributed System
Driven by economic, technical and environmental reasons, the energy sector is moving into an era where electrical demand will be met through wide spread installation of distributed resources or what’s known as Distributed Generation Systems. This paper deals with a distributed generation system (DGS) with fixed speed induction generator based wind turbines (FSWTs) which are sensitive and vulnerable to voltage disturbances and reactive power deficiency. Consequently, the control and protection strategies should be prompt and precise to avoid undesired wind generator shut down. In this paper, a distributed generation system with three combined heat and power generators (CHPs) and three fixed speed induction generator based wind turbines (FSWTs) is initially connected to the grid and feeding dynamic load groups. A fast control strategy is proposed to stabilize the system when the distributed generation system (DGS) is islanded from grid after the occurrence of a three phase fault. This includes governor and exciter control of CHPs, reactive power compensation, and load shedding. Simulation is done in PSCAD/EMTDC and results are analyzed.
Nekkanti S S S Chandra, Dr.P.Somasundaram