Development and Application of User-Defined Variable Shunt Reactor (VSR) Model for Power System Analysis

Voltage control has gained importance owing to the increase in the installation of renewable power on the distribution level power system. Grid connections for renewable power can cause voltage problems, thus necessitating the employment of a voltage control device or technology to control the voltage profile of the line. Traditionally, a fixed shunt reactor (FSR) is used to control voltage. However, it can only control the on/off state for the case when the capacity is fixed. Recently, a variable shunt reactor (VSR) capable of controlling the size of the inductance for each stage has garnered attention. The voltage change occurring upon switching is lower in case of VSR than with FSR, and graded reactive power compensation is possible. Consequently, VSR can be used to efficiently control the voltage. For the actual incorporation of VSR, a power system analysis is necessary. This study developed a VSR analysis model in a form that can be used in a commercial program PSS (R) E. The developed analysis model included various factors of VSR that are necessary for the power system analysis, and various scenarios were introduced for verifying the validity of the model through appropriate simulations.