A Novel Flexible AC Transmission System

The paper summarizes configuration and characteristics of series Flexible AC Transmission System(FACTS) devices,compared with Distributed Flexible AC Transmission System(D-FACTS),which is recently presented.An experimental system of the small capacity D-FACTS controller(DFC) based on active variable reactance is designed,verifying that designed DFC has good function of power flow control.FACTS may be replaced by a series of small capacity DFC to realize the same function.D-FACTS of low cost and high reliability is possible to manufacture,which is proven in this paper,because the small capacity DFC can be assembled by power electronics elements,which are available in a large number on the market.