Mathematical modeling and simulation of an observer based state feedback controller of a statcom to improve the voltage stability of power system

Abstract

Power demand in India is increasing significantly day by day due to the growing population, dynamic economic growth and modernization. To meet such large and growing power needs our power system is facing power quality problems inform of low power factor, poor voltage profile, voltage fluctuations, voltage sag/swell etc. So it is indeed very essential to improve the power transfer capability of existing networks. Installation of FACTS device in existing transmission network is an alternative way to strengthen power transmission capability. A static synchronous compensator (STATCOM) is one of the FACTS devices which is used to control the reactive power and it has also the ability to regulate the grid voltage. Different control techniques are in use to control the amount of reactive power to be injected or supplied by the STATCOM. In this paper, an OBSERVER based state feedback controller is proposed for STATCOM to improve the voltage stability. Mathematical modeling for the controller is also illustrated here. Simulation of observer based state feedback control of STATCOM is performed in MATLAB/SIMULINK. The simulation result depicts the satisfactory performance of STATCOM with proposed controller during three phases to ground fault condition.