18-pulse Rectifier with Electronic Phase Shifting with Autotransformer in Inverter and Rectifier Mode

Yurii Voitovych, V. Makarov, Ievgen Pichkalov
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引用次数: 1

Abstract

To reduce harmonic distortion of the input current, multipulse rectifiers are used. They require the presence of phase-shifting transformers or auto transformers. Elimination of electromagnetic phase-shifting devices while maintaining small harmonic distortion of the input current and obtaining a power factor close to unity is possible with the use of electronic phase shift. The electronic phase shift is realized by means of the rectifier itself: the introduction of positive and negative control angles in the pairs of rectifiers' modules. At present, 12-pulse rectifiers with electronic phase shift are known. Unlike classic rectifiers, they do not use phase-shifting transformers and have a unit power factor. Increasing of the rectifier's pulse makes it possible to improve the harmonic composition of the input current. The use of the principle of electronic phase shift in 18-pulse rectifier leads to different levels of constant voltage at the output of the rectifiers. In this case, to equalize the currents of rectifiers' modules, one can use both an increase the voltage at the input of rectifiers operating with large control angles and a decrease the input voltage of the rectifiers operating with smaller control angles. The principles of constructing of matching auto transformers for the 18-pulse rectifier with an electronic phase shift are considered in the article. Comparison of 18-pulse rectifiers with use of step-up and step-down auto transformers is made. Data on the installed capacity of auto transformers, power losses are obtained. The results of thermophysical modeling are presented. When comparing the parameters of the matching magnetic elements, it can be concluded that it is more appropriate to use a step-down autotransformer.
18脉冲整流器与电子相移与自耦变压器在逆变和整流模式
为了减少输入电流的谐波失真,采用了多脉冲整流器。它们需要相移变压器或自动变压器的存在。利用电子移相可以消除电磁移相器件,同时保持输入电流的谐波畸变较小,并获得接近于1的功率因数。电子相移是通过整流器本身实现的:在整流器模块对中引入正负控制角。目前已知的具有电子相移的12脉冲整流器。与传统整流器不同,它们不使用移相变压器,并且具有单位功率因数。增大整流器的脉冲可以改善输入电流的谐波组成。在18脉冲整流器中使用电子相移原理,导致在整流器输出处产生不同水平的恒压。在这种情况下,为了均衡整流器模块的电流,可以同时使用增大控制角较大的整流器的输入电压和减小控制角较小的整流器的输入电压。本文讨论了18脉冲电子相移整流器匹配自耦变压器的构造原理。对采用升压和降压自耦变压器的18脉冲整流器进行了比较。得到了自耦变压器的装机容量、功率损耗等数据。给出了热物理模拟的结果。通过对匹配磁元件的参数进行比较,可以得出使用降压自耦变压器更为合适的结论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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