Voltage Profile Improvement Using Static Var Compensators (SVC) And Thyristor Controlled Voltage Regulator (TCVR)

Abstract—Abstract The voltage level of the system changes when there is change in load and the drop in the load voltage leads to an increased demand for the reactive power that, if not met by the power system leads to a further decline in the bus voltage. This decline eventually leads to a progressive rapid decline of voltage at that location, which may have a cascading effect on neighboring regions that causes voltage collapse. In this paper, FACTS controllers such as Static VAr Compensators (SVC) and Thyristor Controlled Voltage Regulators (TCVR) are used to maintain the voltage with in the limits. SVC will either supply the reactive power or extract the reactive power and the TCVR will inject series voltage at the load end so as to avoid voltage collapse. Smooth variation of reactive power is possible by controlling the firi ng angle of the thyristors.SVC and TCVR models are developed and tested in IEEE test system, and the outputs are given.