Voltage Profile in a Large Power System Under Power System Contingencies using FACTS Devices

Power quality assessment is required for the proper functioning of sensitive equipment, as well as ensuring that excessive energy losses in a power system are kept to a minimum, resulting in increased profitability. Electrical power systems are prone to several types of power quality disturbances. Under power system contingencies such as when the fault occurs, the system will always have a higher reactive power requirement in order to neutralize the fault and restore the system to a stable state. Flexible AC Transmission Systems (FACTS) devices are the most appropriate solution for resolving these issues. FACTS devices are solid-state power converters that also capable to control electrical transmission characteristics such as impedance, phase & voltage magnitude in transmission or distribution systems. Static synchronous compensator (STATCOM) Controller provides reactive compensation which is inserted in parallel to the transmission & distribution systems that based on Voltage source converters (VSC) with DC link capacitor. In this paper simulation results of voltage profile on IEEE 14-bus bus system with and without STATCOM unit are investigated during a three phase to ground fault. Test system is modelled using the blocks of MATLAB Simulink.