Optimal Sizing and Allocation of SVC and TCSC for reactive Power planning in Meshed Network

Abstract

Power system in stressed condition due to contingencies or overloading can lead to voltage collapse and can no longer operate in the secure region. Flexible AC transmission System (FACTS) devices plays key role in improving power system security and reliability. However, their optimal placement is necessary due to their high installation cost. In this paper Thyristor controlled series compensator (TCSC) are used for solving line overloads by controlling active power and static VAR compensator (SVC) are used for solving low voltages by controlling reactive power. Sensitivity based approach is used to find optimal placement of FACTs devices and PSO is utilized to find optimal size with objective to reduce real power loses and voltage deviations The indices are calculated for both normal condition and under severe contingencies. The Algorithm is applied on 30 bus test system and maximum loading factor are calculated with different combination of FACTS placed at their optimal positions. The study shows that there is improvement in voltage profile, voltage stability, loading parameter and reduction in active power losses.