An approach to improve active power flow capability by using dynamic unified power flow controller

Ever increasing power demand has made it essential to utilize the available transmission network resources. As a fact, steady state model of flexible alternating current transmission system (FACTS) devices have been used in many studies to improve power flow capability (PFC) in the transmission lines. In this paper, a dynamic model of unified power flow controller (UPFC) has been implemented to enhance the active power flow in transmission line. In addition, improving the bus voltages as well as reduction in the power losses also aimed with UPFC´s presence. Both the controllers of shunt and series converters of UPFC are designed with PI controller. The performance of the proposed approach has been tested on IEEE 5-bus and IEEE 14-bus systems under PSCAD environment. The simulation results revealed that the proposed dynamic UPFC has effectively increased the active PFC in power system with the minimization of power losses.