Operation test and industrial application of SVC for mitigation flicker from electric arc furnaces

The situation at electric arc furnace factory is always severe containing voltage fluctuation and flicker, three-phase imbalance and low power factor. The dynamic var compensator is a good solution to this condition. The static var compensator (SVC), with its continuously variable compensation, also safeguards the plant against overcompensation during furnace outages. The SVC equipment, offered by NARI-RELAYS, presents a phase-wise open-loop reactive power controller and a three-phase closed-loop power factor control, which are based on high-speed space vector control. The factory system test on physical simulator is implemented, and its open-loop response time is less than 7 milliseconds with closed-loop one less than 25 milliseconds. One electric arc furnace plant's engineering is illustrated as an example to show the effects with/without SVC function.