Principle of Harmonic Elimination
In analyzing the operation of 12-pulse rectifier (Fig. 1),some methods are dedicatedly designed to shape the output current of 12-pulse rectifier (irec1, irec) so as to minimize the
ac-side harmonics (ia, ib, ic) formed by the operation of the rectifier. The exact shape of the rectifier output current that results in complete elimination of ac input current harmonics