PERFORMANCE INVESTIGATION OF SERIES COMPENSATOR FOR POWER FLOW CONTROL

Abstract

Flexible AC Transmission Systems (FACTS) involves the incorporation of power-electronic controlled devices into ac power transmission systems in order to extend the powertransfer capability of these systems beyond their traditionally accepted boundaries. One particular category of FACTS devices makes use of high-powered voltage source inverters to insert near-sinusoidal ac compensating voltages into the transmission system. Multi-level inverters best suited for high voltage and high power applications. This thesis deals with the simulation and performance analysis of SSSC using two six pulse VSI, Five level FCMLI, and H Bridge MU. Sinusoidal Pulse width modulation technique (SPWM) is used to generate the pulses. A method for controlling the FCMLI is used which ensures that the flying capacitor voltages remain constant using the preferential charging and discharging of these capacitors. For H- Bridge ML1 clustered voltage balancing is used to balance the capacitors. Simulation studies and performance investigation is done by using MATLAB/Simulink software and the results confirm the performance of the control strategy