输入电压不平衡时的12脉冲自耦变压整流器

在含有较多非线性负载的航空供电系统中常存在三相输入电压不平衡的情况。详细分析了输入不平衡对12脉冲自耦变压整流器(ATRU)的输出电压、输入电流的影响,并提出了采用谐波抑制电抗器(HBR)来抑制谐波电流。分析了工作原理,比较了几种HBR构成方案,研制了一台2kW的演示样机。实验结果表明,谐波抑制电抗器有效抑制了三相输入电压不平衡的影响。

12-Pulse Auto Transformer Rectifier Unit Under Input Voltage Unbalance

In power systems with a large percentage of nonlinear loads, there is usually an imbalance among the three-phase input voltages. This article carries out a detailed analysis of the impact that the unbalanced input condition has upon the output voltage and input current of a 12-pulse auto transformer rectifier units (ATRU). In order to counter the effect of input unbalance, the article adopts a harmonics blocking reactor (HBR) to suppress current harmonics. It compares several implementation solutions of the HBR, and finally decides on the optimal one. Furthermore, a 2 kW laboratory prototype is developed, and the experimental results show that under the condition of input imbalance the use of HBR leads to a dramatic improvement in performance.