Reactive Power Ancillary Service from Wind Farms

Reactive power/voltage control support, temporary primary frequency control support, power oscillation damping support are some of the functions that can be provided by modern wind farms (WFs) equipped with variable speed wind turbines (VSWT) with power electronic converters. This paper examines the possibility of WFs providing reactive power support to the grid system as part of ancillary service provisions. Detailed analysis of the WF capability curve is carried out, and a reactive power cost model is developed for wind turbine generators that can help the market operator or the independent system operator (ISO) in managing the system and the grid efficiently. The Cigre-32 bus test system is used to demonstrate a case study showing a 24-hour calculation of 10-minute average system operation cost considering the incoming wind energy.