EFFECT OF VARIATION OF LOADING CONDITION ON STATCOM CONTROLLER
The Single Machine Infinite Bus (SMIB) power system installed with STATCOM is considered for the analysis. The static excitation system model type IEEE-ST1A has been considered along with a conventional PSS. The STATCOM is based on pulse width modulation (PWM) voltage source converter (VSC).It is used for Shunt compensation .Shunt compensation has the ability to automatically support the voltage level in a specific area of the power system. The voltage level is an immediate image of the reactive power balance – too high a voltage means a surplus of reactive power and vice versa. The systems react dynamically to changes in active and reactive power, influencing the magnitude and profile of the power systems voltage. Quite often it gives rise to a myriad of operational problems; the system operator has to intervene to try to achieve power flow redistribution, but with limited success .shunt compensator automatically and instantaneously adjusts the reactive power output smoothly as desired and thus improving the system stability.The dynamic performance of the system with/without the controllers Has been studied by taking different loading Conditions.