变频器在选煤厂应用的优点及网侧谐波电流计算

Advantage of the usage of frequency changer at coal preparation plant & calculation of the electric current of net-side resonance wave

介绍了变频器的工作原理及其在选煤厂电动机调速中应用的优点,但变频器的应用也带来了网侧谐波问题,实例分析了谐波电流计算方法和抑制谐波的措施。

Introduced is the working principle of a frequency changer and its advantage in use for speed variation of motor at coal preparation plant;but usage of frequency changer brings forth the problem of net-side resonance wave;by a practical example,analyzed were the calculation method of electric current of resonance wave and measures for its depression.