Utilizing phase shifting transformer for effective integration of wind generation

Due to the ever increasing interest in integration of renewable energy sources on the one hand and the limitations of power systems on the other hand, the effective utilization of existing assets is crucial to maximize the amount of renewable sources that can be accommodated. One example of such assets is phase shifting transformers (PST). An existing PST, which is currently on a manual regulation mode, controls the active power transfer on a 138kV tie line connecting the southwest of Alberta system to the southeast of the BC system. The Alberta SW region is a leading producer of wind energy. Due to the transmission system limitations, several Remedial Action Scheme (RAS) have been installed which run back/trip wind generators. This paper shows that automatic control of this PST with proper settings along with modifications to protection schemes can reduce the risk of RAS operation which in turn will enable the system to accommodate higher level of wind power penetration. This paper can also be viewed as guidelines for the required studies to identify potential problems and possible solutions for future similar applications.