Elimination of harmonics using multi-pulse rectifiers

Multi-pulse rectifiers are used in various technical applications for the harmonics reduction of the input current drawn from the network. The paper presents elimination principles of dominant harmonics for a twelve-pulse rectifier with Dd0y1 transformer and for an eighteen-pulse rectifier with Dy1z1+20⁰z1-20⁰ transformer. This paper also provides a comparison of the theoretical assumption of the harmonic eliminations to experimental results obtained using a three-phase source enabling to supply the tested circuits with almost purely sinusoidal voltage, to results obtained supplying tested rectifiers directly from the network and to the results from a simulation model using EMTP-ATP program.