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This paper presents a new method to eliminate harmonics drawn by a twelve-pulse rectifier through modulation of the dc bus. A PWM converter with low ratings is inserted in the dc link and controlled in a fashion that results in sinusoidal currents at the input. The bulk of the power transfer is handled by the diode bridges, while the additional PWM converter deals only with a ripple voltage.Circuit implementations applicable for series and parallel connections of the two constituent six-pulse sections are described. The proposed approach offers a low-cost alternative to PWM rectifiers or 18-pulse rectifiers. Operation of the circuit is verified through computer simulations.

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