Auxiliary Supply Assisted Harmonic Suppression for 12-Pulse Phase-Controlled Rectifiers

抄録

A 12-pulse phase-controlled rectifier consists of two sets of 6-pulse rectifiers. It is found that harmonic distortion of the input current is minimized if dc currents of the two rectifiers are in a boundary between continuous and discontinuous conduction modes. In order to realize the boundary mode operation under any load conditions an auxiliary voltage supply (AVS) is introduced. The AVS is required a bi-directional power flow but its handled net power is quite small. Capacity of AVS is less than 10% of rated rectifier output. A simple AVS arrangement is proposed and the usefulness is verified by simulation and experimental results.