Multi-pulse stream refers to the output DC voltage than 6 wave heads in one cycle in a three-phase power supply system, usually 12, 18, 24 pulses. Multi-pulse rectifiers are typically composed of phase-phase rectifier transformers and rectifying bridges. The input three-phase voltage is moving through the transformer, producing several sets of three-phase voltage output to the rectifier bridge. Multi-group three-phase rectifier bridges are connected to each other, so that harmonics generated by the rectifier bridge circuit mutual offset. Multi-pulse rectification techniques can not only reduce harmonics of AC input current, but also reduce harmonic amplitudes in the DC output voltage and increase ripple frequency.
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