JEE_V1_N1_RP4 Mudhafar AlNema Journal on Electrical Engineering 2230 – 7176 1 1 42 45 Power flow control, single phase inverter, phase shift control The basic structure of the UPFC consists of two voltage source inverters; one of them is connected in parallel, while the other converter is in series with the transmission line. The main scope of this paper involves in designing the series connected branch of the converter, which provides a regulated voltage with variable phase shift with respect to the sending end voltage. A microcontroller program has been developed to provide a required phase shift so that it can control the amount and direction of transmitting power.The experimental result of single phase lab scale model have been achieved, which showed a good agreement with simulated results obtained from simulated model developed in Mat lab software. July - September 2007 Copyright © 2007 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=479