Abstract: Static var compensator (SVC) as one component of flexible Ac transmission systems (FACTS) device. Play an important role in controlling reactive power flow to power network. Because of economic consideration identifying the best location for installing the SVC is also important. This paper discusses the optimal allocation and size of static var compensator to improve voltage magnitude for a power system. National grid of Sudan (NGS) transmission lines-500KV is used as case study. Solution is obtained using Neplan software. The results show the optimal allocation is in the kabashi bus with size of 90.392MVAR.

Keywords: Static var compensator (SVC), National grid of Sudan (NGS), flexible Ac transmission systems (FACTS) device.