无平衡电抗器24脉自耦变压整流技术研究
Research on Technology of Non-Balanced Reactor 24-Pluse Auto-Transformer Rectifier

提出了一种利用电压矢量合成的无平衡电抗器24脉自耦变压整流器拓扑结构，自耦变压器每相5个绕组，根据不同绕组之间叠加的电压矢量使4组整流桥在同一时刻只有两个二极管导通，并将电压矢量差值最大的线电压送至输出端，主整流桥与辅整流桥根据不同时区主辅电压矢量的合成依次自然换向，不对称的输出电压矢量构成形式使整流桥可直接并联输出24脉波直流电压.论文推导了自耦变压器的匝比、系统输入电流表达式及输出电压表达式，并通过对网侧电流谐波含量及变压器等效容量的计算分析了系统的性能，最后通过仿真以及实验验证了设计的合理性.
In this paper, a topology of non-balanced reactor 24-pluse auto-transformer rectifier was proposed based on the composition of voltage vector. Each phase of the auto-transformer was arranged with five windings, conducting two diodes of four rectifier bridges at synchronization according to the voltage vector superposition of different windings and outputting the line voltage with the maximum vector difference. Conducting the main rectifier bridge and the auxiliary bridge successively according to the time zone of the main and auxiliary vector composition, the rectifier bridges could parallelly output the 24-pluse DC voltage due to the composition form of the asymmetric output voltage. The turn ratio of the auto-transformer, the expression of input current and output voltage were derived, and the system performance was analyzed by calculating the input current harmonic content and the equivalent capacity of transformer. Finally, the rationality of the design was verified by simulation and experiment