This paper deals with power quality improvement by using TCTC & STATCOM. When the reactive power of the load is changing continuously, a suitable fast response compensator is needed. STATCOM and TCTC (Thyristor controlled tap changer) are two such compensators belonging to FACTS devices. They are used in this work. Models for the STATCOM &TCTC (Thyristor tap changer) are developed using MATLAB simulink. Smooth reactive power control is achieved by varying the firing angle of TCTC system. The simulation results of eight bus system with STATCOM & TCTC are presented.

Key words: Reactive power, STATCOM, Thyristor controlled Tap changer.