36-pulse high-power frequency conversion rectifier transformer

Abstract

The invention discloses a 36-pulse high-power frequency conversion rectifier transformer, comprising triphase input primary winding which is mounted on a bracket and adopts Y-shaped connection and a phase shifting secondary winding adopting epitaxy triangle connection, wherein, the secondary winding comprises three groups, each of group comprises 6 phase shifting groups, the phase shifting angles are respectively +25 degrees, +15 degrees, +5 degrees, -5 degrees, -15 degrees and -25 degrees, each phase shifting group angle difference is 10 degrees; each phase is formed by series connection of a plurality of power units, adjacent groups of the triphase secondary output differ 10 degrees, the 6 phase shifting groups obtain 18 positive pulses and 18 negative pulses by controlling and triggering silicon controlled IGBT by different timing sequent of triphase pulses; the each phase shifting group has 3 taps, and each group has 18 taps in all which are connected correspondingly and arranged on the output wire ranging of one side of the bracket, and three groups of output wire ranging are used for connecting the transducer; the invention can reach less than 5% of network side current harmonics relief and has compact structure, small volume, simple installation, small field wiring and convenient debugging.

Description

technical field [0001] The invention relates to a rectifier transformer, in particular to a rectifier transformer matched with a 36-pulse high-power frequency converter. Background technique [0002] The international energy crisis has made it urgent to demand high-efficiency energy-saving technologies and equipment systems. On the other hand, power electronics technology has made breakthroughs, developing from the rectifier stage to the inverter stage, in order to realize power regulation, cascade adjustment and other systems , Energy saving provides the possibility of realizing the technology. In the 1980s, frequency converter technology began to be widely used in major industrialized countries as an energy-saving technology. Frequency conversion not only plays the role of energy saving but also plays the role of precise process control. Frequency converter speed regulation has the advantages of wide speed regulation range, high speed regulation precision and good dynamic...

AI Technical Summary

Problems solved by technology

The hazards of harmonics are well known. Harmonics in power distribution cables and transformers are likely to cause local parallel or series resonance in the power grid or fuel generators, resulting in additional losses and increased noise, which will cause malfunctions of air switches, relays and contactors. Generator surge and other adverse consequences reduce the utilization rate of power generation and transmission equipment. Harmonics also cause electromagnetic interference to the surrounding environment, affecting communication quality and normal operation of equipment, making conventional electrical instrument measurements inaccurate, resulting in serious pollution to the power grid

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