Multi-pulse rectification means that in a three-phase power system, the output DC voltage has more than 6 wave heads in one cycle, usually 12, 18, and 24 pulses. The multi-pulse rectifier usually consists of two parts, a phase-shift rectifier transformer and a rectifier bridge. The input three-phase voltage is phase-shifted through the transformer, and several groups of three-phase voltages are output to the rectifier bridge. Multiple groups of three-phase rectifier bridges are connected to each other, so that the harmonics generated by the rectifier bridge circuit cancel each other out. Multi-pulse rectification technology can not only reduce the harmonics of the AC input current, but also reduce the amplitude of the harmonics in the DC output voltage and increase the ripple frequency.
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