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Study on Mechanism of a Novel Autotransformer for 18-pluse Rectifier

机译：新型18脉冲整流器自耦变压器的机理研究

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摘要

From the aspect of the isolated transformer for 18-pulse rectifier, a new topology of the 18-pluse autotransformer-rectifier with the advantages of small equivalent capacity, low harmonics and outstanding symmetrical structure is proposed, which is superior to the existing American patents. The relationship between the input and output currents, the distortion of input current, the relationship between the voltage of each branches and the phase shift angle and the equivalent capacity of the autotransformer are derived by using the potential vector diagram and the balance principle of the magnet potential. The phase shift angle of the proposed novel 18-pulse autotransformer is 20° that is exactly the same with the isolated transformer, which verifies the potential vector of the two is coincident. The input current distortion rate of this autotransformer is 10.05%, which reduces the harmonics of the rectifier to the power grid. The equivalent capacity is only 17.76% of the output power, which greatly reduces the volume and weight of the system. Finally, a prototype is made, which validates the correctness of the theoretical deduction and simulation, and provides a theoretical guide for future design.
机译：从用于18脉冲整流器的隔离变压器的角度出发，提出了一种18倍以上自耦变压器的拓扑结构，该拓扑结构具有等效容量小，谐波低，对称结构突出的优点，优于现有的美国专利。利用电势矢量图和磁体的平衡原理推导了输入电流和输出电流之间的关系，输入电流的畸变，每个分支的电压与自耦变压器的相移角和等效容量之间的关系。潜在的。提出的新型18脉冲自耦变压器的相移角为20°，与隔离变压器完全相同，这证明了两者的电势矢量是一致的。该自耦变压器的输入电流失真率为10.05％，从而减少了整流器对电网的谐波。等效容量仅为输出功率的17.76％，这大大减少了系统的体积和重量。最后，制作了一个原型，验证了理论推论和仿真的正确性，并为将来的设计提供了理论指导。

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