Transmission loadability enhancement by using FACT devices with Fuzzy logic Controller

Voltage stability is the ability of a power system to maintain acceptable voltages at all nodes in the system under normal condition and when being subjected to disturbances . Voltage instability is becoming a serious problem due to complexity of the network which is becoming more complex due to the increasing demand of power. As power systems become more complex and heavily loaded, along with economical and environmental constraints, Real and Reactive power control/compensation in transmission systems improves the stability of the ac system. It is a very useful part of a power system. It also helps to maintain a substantially flat voltage profile at all levels of power transmission, and it improves performance, increases transmission efficiency, and can avoid voltage collapse. FACTS devices are recognized as a new damping resource for poorly damped, low frequency electromechanical oscillation, which usually takes place in a power system operating with long transmission lines under heavily loaded condition. Nevertheless, the damping effect of FACTS devices is known to be strongly influenced by their location and control system. This paper is motivated to cope with these two challenges. By ways of Modal Analysis, a location index for determining FACTS optimal location is proposed which is suitable and feasible for large- scale power systems. A method for tuning parameters in the FACTS control system with a given configuration is presented simultaneously. We are using STATCOM with Fuzzy logic controller for the same.