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Application of RSVG in EAF -- CangzhouLingang MITSUBISHI

Electric arc furnace (EAF) is a kind of electric furnace which uses the heat generated by electric arc to smelt metal. With the comprehensive ban of intermediate frequency furnace by the state, more and more EAFs have been applied in recent years, and most of them are ultra-high power. The load characteristics of electric arc furnace are nonlinear and time-varying, and its power quality is very poor, which will cause many system power quality problems, such as voltage flicker and fluctuation, large negative sequence component, more harmonics, low power factor and so on. Among many power quality problems caused by electric arc furnace, voltage flicker is the most difficult to control. Because voltage flicker is caused by the irregular fluctuation of reactive power and voltage, requirement for response speed and compensation accuracy of the compensation device are very high. Because SVC is based on semi controlled thyristor, the response time of SVC is usually more than 10 ms, and the best flicker suppression ratio that it can achieve is 2:1. The SVG based on VSC scheme has the advantage of fast response, which can theoretically achieve a flicker suppression ratio of more than 5:1. Although H-bridge cascaded SVG has been widely used in 10kV and 35kV medium voltage power systems, few SVGs have been successfully used in EAF load compensation in China.

RSVG series low voltage static var generator for Imbalance of ESR furnace in University of Science and Technology Liaoning

DINGXIN SULAWESI NICKEL PLANT SVC PROJECT