Voltage Dip Analysis of Electricity Networks on Wind Energy Integration

The paper analyses the nature of voltage dip in electrical networks integrated with wind energy conversion systems (WECSs) with three different types of generators, viz., permanent magnet synchronous generator (PMSG), doubly-fed induction generator (DFIG) and the fixed speed induction generator (FSIG). The test network along with the wind generators and loads is modeled in DIGSILENT Power Factory. The voltage dip is generated by applying a three-phase short-circuit fault to one of the transmission lines in the test network. Impact of wind integration is analyzed and compared for different wind generators, different loadings on the network and different utility grid strengths. The results indicate that out of the three types of wind generators, FSIG is the most unfavorable choice and there are trade-offs between the other two types (PMSG and DFIG).