FACTS modelling and control: Application of CSC based STATCOM in transmission line

Flexible AC Transmission Systems (FACTS) devices have been used in power systems since the 1970s for the improvement of its dynamic performance. Among these devices, Static Synchronous Compensator (STATCOM) is a shunt connected FACTS device, which is capable of providing reactive power compensation to the power system. This paper describes a static synchronous compensator using PWM current source converter (CSC). In this paper, initially the dynamic dq-frame model of the CSC based STATCOM is presented and its linear steady-state characteristics are derived based on the model using power balance equation. Letter on, the operation of CSC based STATCOM system is analyzed in detail through a theoretical approach and computer simulation with Matlab/Simulink. This paper also presents the advantages of CSC topology over VSC topology based STATCOM.