Loss minimization with D-FACTS devices using sensitivity based technique

The concept of Distributed Flexible AC Transmission Systems (D-FACTS) was introduced in order to provide a cost-effective solution for power flow control. Distributed Static Series Compensator (DSSC) device can be clamped on to existing power lines and be operated so as to control the impedance of the conductor - realizing the first in a family of D-FACTS devices. Determining the location and amount of distributed compensation to be employed is an important problem. The impact of installing D-FACTS devices is examined by studying the sensitivities of power system quantities such as voltage magnitude, voltage angle, bus power injections, line power flows and real power losses with respect to line impedance. This paper presents a novel strategy for the application of D-FACTS devices in Loss Minimization. The most appropriate location to install D-FACTS devices is determined by studying the sensitivities of transmission losses with respect to line impedance. Sensitivities enable us to determine the potential benefits of the D-FACTS Devices offered to the system. The proposed methodology has been applied under simulated condition on IEEE 118-bus test system.