Phase frame analysis of wind turbines in unbalanced distribution system

The main objective of this study was to analyze the effect of installing individual wind turbines and large capacity wind farms on severely unbalanced distribution systems using phase coordinate method. Generalized Distribution Analysis System (GDAS), a comprehensive package developed by ESRC was used to do the analysis. Researches were conducted into the operation and characteristics of several modern wind turbines and the information was used to develop a simple model that was consistent with the three phase representation and other requirements of GDAS, while satisfying the reasonable data requirements. A radial distribution system with two 13.8 kV feeders was developed for the analysis. The sample system was simulated at severe operating conditions to evaluate the current capability of the system and also to analyze the effectiveness of alternative plans for the system expansion. These analyses suggested a new strategy to manage reactive power in the system and help the wind turbines to stay connected with severe operating conditions.