A Topology for Reactive Power Compensation in Grid System Using a Low-Cost Thyristor Switched Capacitor Scheme

The device described in this publication is a thyristor-switched capacitor (TSC) device used in a 200 kV/11 kV, 200 MW grid system. In addition to the capacitor bank's transient-free switching, a technique for compensating VAR is described. This study's goal is to offer a topology at the lowest possible price. Flexible AC transmission systems (FACTS) have been developed as an alternative to conventional methods for enhancing the efficiency, reliability, and power quality of electrical energy networks. These systems are currently in use in many countries across the world. FACTS are generally referred to as systems that control voltage, impedance, and phase angle in AC systems. Furthermore, due to advancements in semiconductor technology, static VAR compensation devices have begun to be used on the medium and high-voltage sides. The ability of these systems to make adjustments without relying on VAR from the grid is their key strength. In this study, a static VAR compensator made up of three TSCs and one TCR structure is used to supply the system with the necessary VAR. In the simulation studies, the static compensator is used to supply the VAR instead of a voltage source. This prevented the system from using its capacity inefficiently. The use of static VAR compensators is advised, especially when an unbalanced load and instant VAR are needed.