STATCOM and Multilevel VSC Topology: A Review

In electrical power system, Flexible AC Transmission System (FACTS) Devices provides better performance than conventional controllers. Voltage Source Inverter (VSI) based Static Synchronous Compensator (STATCOM) is one of the best device among various FACTS controllers. In last couple of decades, many control technologies for STATCOM have been proposed. In this review paper, authors have categorized different control algorithm, switching schemes and converter topologies. Different multilevel converter schemes are proposed for the better performance of the Voltage Source Converter. Cascade H-bridge multilevel converter topology gives the better results than other topologies. For multilevel converter conventional PI, FUZZY controller, FUZZY-PI and FUZZY-PID controllers are used. The application of STATCOM at various conditions in power systems are also discussed in the reviewed publications.