An Optimization Method of Passive Dynamic Harmonic Filter Used for Medium Frequency Furnace

Abstract

The medium frequency furnace is a kind of a stable metal smelting device. The passive dynamic harmonic filter is applied for the medium frequency furnace. Its running results show that the filtering efficiency of this filter is different due to the change of the resonance point during its operation. The most serious situation is to increase the harmonic current of the power grid. Therefore, an optimization method of the passive dynamic harmonic filter used for the medium frequency furnace is proposed in this paper. The following works have been done in the study: to describe and analyze the causes of low filtering efficiency of the medium frequency furnace, to design the interlock circuit between the medium frequency furnace and the passive dynamic harmonic filter, to optimize method of running/pausing the passive dynamic harmonic filter. The passive dynamic harmonic filter with the optimized method has been successfully used in the medium frequency furnace. The running results show that the operation of the passive dynamic harmonic filter is normal and the filtering efficiency is greatly improved.