Voltage stability assessment of DFIG wind turbine in different control modes

Integrating wind power generation has direct impacts on a distribution network such as power quality, reliability, loss, and voltage profile problems. Thus, a high penetration level of wind power generation is a significant challenge to the traditional system operation on voltage stability. In this paper, a method to evaluate voltage stability of doubly-fed induction generator (DFIG) wind turbines for fixed voltage control and power factor control modes is proposed. The study considers on load tap changers (OLTC) and over excitation limiter (OEL) with static load. A small distribution network of Provincial Electricity Authority (PEA) of Thailand is used for real time simulation. The impact of different control modes of DFIG is compared. Test results indicate that the operation of DFIG with the interaction between OLTC and OEL equipment has a considerable impact on voltage stability.