浅析在化工行业滤波电路中电容器的选择

Analysis of the Selection of Capacitor in Filter Circuit in Chemical Industry

为了解决谐波的巨大危害,在工程实践中有效治理谐波问题,提出最有效的办法就是在系统中加装滤波电容器。首先介绍了滤波器的分类。其次,分析了在谐波存在时,滤波电容器会产生并联谐振和串联谐振现象。尤其是当谐波是某个特殊频率次数时,对滤波器对谐波电流的放大情况进行了论述,并考虑串联电抗器对过电压影响,给出了过电流倍数和过电压倍数的计算方法。在工程设计中,合理使用滤波电容器对电路优化有积极的意义。

In order to solve the great harm of harmonics and effectively control harmonics in engineering practice,the most effective way is to install filter in the system.Firstly,the classification of filters is introduced.Secondly,in the presence of harmonics,the filter will produce parallel resonance and series resonance phenomenon.Especially when the harmonic is in a special frequency,the amplification of harmonic current by the filter is discussed,and the calculation method of overcurrent multiple and overvoltage multiple is given considering the influence of series reactor on overvoltage.In engineering design,rational use of filter capacitors has positive significance for circuit optimization.