Modelling and Simulation of An Isolated Power Generating System Using Doubly Fed Induction Generators

Abstract

There are many load centres that are isolated from the main utility grid. Some of them are remote villages, islands, ships, etc. They require isolated electric supply by means of stand-alone electrical generators to provide for their local electrical loads. The proposed model is used for standalone system where the power is fed directly to the local loads for the applications where the connectivity to the grid is not possible. The system can also be made to work in combination with grid and local loads .In Islanding mode the generator supplies the local loads during the light load and during heavy load condition, the excess power is absorbed/ supplied by battery energy storage system (BESS) which is connected parallel to dc link capacitor. A three phase load, independent wind energy conversion system is employed using DFIG operated at variable speeds for supplying the power to local loads and also perform the function of load levelling and harmonic elimination.