An approach for improving voltage stability by combination of SVC and TCSC

This paper addresses the application of an efficient and an economical method in term of enhancing voltage stability. We propose to combine the performances of SVC (Static VAR Compensator) and TCSC (Thyristor Controlled Series Compensator) to reach those of UPFC (Unified Power Flow Controller), the most pricey and polyvalent FACTS device (Flexible AC Transmission Systems). In this way, we assure stable power system operation while avoiding costly investments. For the placement of the proposed FACTS, we opt for applying a simple heuristic method. This would provide firm bases for the comparison. The investigation of the proposed idea and the comparative studies are performed in the IEEE 14-Bus system under EUROSTAG environment.