Power System Voltage Stabilizer Using LC Resonance Circuit With Superconducting Coil and Capacitor

These days, voltage stability of power system is very important for example in semiconductor industries. So, development of a device suppressing voltage sags in power system is expected. In this article, the authors propose a new voltage stabilizing device using a LC resonance circuit composed of superconducting coil and capacitor connected in parallel. This power system voltage stabilizer acts automatically against a voltage sag or a steep voltage change, and it suppresses the voltage drop for several cycles by releasing its stored energy. The authors have confirmed this principle experimentally using a small model system using a LC resonance circuit with a superconducting coil and a capacitor. The experimental results and some theoretical analyses are presented.