Control Strategies for a Static VAR Compensator to Upgrade Voltage Stability and Harmonic Contamination in Grid System

This paper describes control strategies for SVC to stabilize the voltage profile in a grid system due to the presence of harmonics. Voltage fluctuation occurs on a regular basis as a result of load variation. So to overcome this problem, a test model of SVC is proposed to upgrade the voltage profile in a grid system. In the test model of SVC, three TSCs and one TCR are used to provide or receive reactive power to the grid according to the fluctuation in grid voltage and it also suppresses the harmonics present. In the test model of SVC; there is a group of shunt capacitor banks and inductors with a fast speed of response managed by thyristor switching. The VAR required for compensation at the point of connection of SVC is provided by adjusting the fundamental frequency component of the current drawn by TCR. The SVC supplies or draws Reactive power depending on the equivalent reactance i.e. capacitive or inductive. In this paper, the role of control strategies of SVC is described to upgrade the voltage profile and suppression of harmonics at different instants level by exchanging the VAR.