Analysis and design of multi-stage passive filters for 100 MVA industrial power converters

This paper presents a design procedure of multi-stage passive filters for high power industrial power converters. The proposed design procedure is based on the calculation of the different variables related to passive filters compensation performance, the restrictions imposed by the IEEE Std. 519-1992, and the attenuation factor associated with the equivalent impedance of the distribution system. The proposed procedure is aimed to obtain the best distributed harmonic filtering effectiveness, reduced filter losses and the number of spare parts in passive filter components. In addition, this paper presents the compensation effectiveness of the passive filter designed with the proposed procedure in presence of inter and sub-harmonics which are typically injected by cycloconverters used in grinding mill drives.