Optimal location of thyristor Controlled Series Capacitor to improve power system performance using Line based composite Index

The power system should be monitor frequently to overcome the problems of voltage stability, losses and to enhance the power flow. These problems can be controlled by using the Flexible AC Transmission System (FACTS) devices. They help to improve the voltage profiles and minimize the real power losses of the system. Thyristor Controlled Series Capacitor (TCSC) is one of the FACTS devices which are easier to control than other control devices. In this paper the placement of TCSC has been proposed based on composite index which consists of two line based indexes called Fast Voltage Stability Index (FVSI) and Line Utilization Factor (LUF) to improve the voltage stability and enhance the power transfer capability by minimizing the real power losses. Further for sizing of the TCSC and generation reallocation multi objective function is considered, which consists of real power generation cost, voltage deviation and real power losses. Krill Herd (KH) algorithm is used to solve the multi objective problem. Krill Herd is a nature inspired algorithm. For the verification of the proposed method, simulation is performed on IEEE 14 bus system and it is observed that results were efficient and there is an effective reduce in the losses of the system, voltage deviation and real power generation cost.