Analysis of the Harm of Harmonics in Power Supply System and the Application in the Mine Production

In recent years,with the rapid development of the electric and electronic technology,the application of a high power switch devices are more and more extensive,to make industries more automatic and productions more efficient,these devices also produce a large number of high times of harmonics and pour them into the power network too,pollute the environment of the power network.In this article,based on analyzing of the traditional LC filter,discussing with a real automatic control system of a hoister system of Kailuan mine,the author analyzes the source of harmonics and different times harmonics,gives improved filter circuit to reduce the fifth time harmonic,simulated by K_Sf analysis,this circuit can greatly improve the filter effect of the fifth time harmonic.