Analysis and Design of Passive Filters to Reduce Line Current Harmonics for Controlled Rectifiers

Many researchers have sought to use different methods to reduce harmonicsin the input current wave of the rectifier, In this study the method of passive filterconnections are used, which is the most commonly used method. The filters that havebeen used in this study are connected in parallel (shunt) with the rectifier. Where theidea of these filters to provide a path with a very low impedance to the harmonics of thecurrent. These filters must be capable of withstanding rated voltage of the system. Inthis study two types of passive filters are explained and used (Single tuned filter andSecond order high-pass filters). Also mathematical analysis of these types of filters andwaves are given. Filters were designed at several values of the firing angles of therectifier.