Power flow assessment in transmission lines using Simulink Model with UPFC

The planning and operation of interconnected large power systems is becoming complex. The power transfer capability of long transmission lines is usually limited by large signals ability. Economic factors such as the high cost of long lines and revenue from the delivery of additional power give strong intensive to explore all economically and technically feasible means of raising the stability limit. The development of effective ways is to use transmission systems at their maximum thermal capability. In this paper a Simulink Model is considered with UPFC model to evaluate the performance of a single and double transmission line systems (6.6/22) kV. The UPFC model is a member of the FACTS family with very attractive features and it is a solid state controller which can be used to control active and reactive power flow in a transmission line. In the simulation study, the UPFC model facilitates the real time control and dynamic compensation of AC transmission system. It provides the necessary functional flexibility required for solving the problems faced by the utility industry. It should be considered as real and reactive power compensation, capable of independently controlling voltage profile as well as the real and reactive powers in the line. The simulation model is tested for single and double transmission line systems with and without UPFC model in MATLAB / SIMULINK environment.