Field Test Verification of the Series Static Voltage Compensator for Power Distribution Line

Abstract

Conventional voltage control on a distribution line has been carried out by Load Ratio Transformer (LRT) and Step Voltage Regulator (SVR). However, since the object of these control methods is slow voltage fluctuation, the high-speed voltage control system is required according to the spread of electronic equipment. This paper presents a developed 75kVA series Static Voltage Compensator (SVC). This system configuration is the same as the Unified Power Flow Controller (UPFC) which is consists of shunt and series controllers combined with a DC bus. Firstly, a design concept for installing a single pole on the distribution line is described. Furthermore, the field test was carried out on the line that has momentary voltage sag by starting an induction motor. The way of the installed place selection and the parameters setting for calculating the compensated voltage is described. It was confirmed that the voltage control performance of the SVC achieved our desired end, and 75kVA SVC shows the effectiveness of the voltage compensation.