Document Abstract
This paper provide an overview of power electronics based controller and focuses on the issues and benefits of applying FACTS controller in traction system. Threshold of Power Electronics Revolution leads to development of electronics based controller an emerging and improved technology for enhancing reliability & power flow control, this paper focus on basic circuit, characteristic of several FACTS controller like STATCOM & SVC and how they utilised for traction purpose.It is also important that with FACTS controller in the traction system, adequate power quality can be achieved with in at lower voltages than would otherwise be possible. This paper provides a framework for comparing the advantages of STATCOM over SVC in traction.