Application of pulse multiplication in autotransformer based AC-DC converters for direct torque control induction motor drives

Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010 Pub Date : 2010-11-09 DOI:10.1109/ICHQP.2010.5625369

S. Nakhaee, A. Jalilian

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Abstract

Power quality improvement has been achieved using a 24 pulse autotransformer based ac-dc converter. The idea is to use an autotransformer based 12-pulse ac-dc converter and incorporating pulse doubling method for improving power quality ac mains for feeding a direct torque controlled induction motor drive (DTCIMD) load. The scheme uses a star connected autotransformer to produce 12-pulses with flexibility to adjust its voltage ratio which makes it suitable for retrofit application where a 6-pulse diode bridge rectifier is being used. Using the proposed 24-pulse AC-DC convertor, harmonic currents up to 21st order has been eliminated in the AC mains currents. A set of power quality indices on input AC mains for the proposed ac-dc converter feeding DTCIMD are also presented to compare its performance with 6-pulse and 12 pulse ac-dc converters. Also the effect of load variation on DTCIMD fed 24-pulse ac-dc converter is studied to demonstrate the effectiveness of the proposed ac-dc converter.

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脉冲倍增在基于自耦变压器的交流-直流变换器中直接转矩控制感应电机驱动的应用

采用基于交直流变换器的24脉冲自耦变压器实现了电能质量的改善。这个想法是使用一个基于12脉冲交流-直流转换器的自耦变压器，并结合脉冲倍增方法来改善电能质量，交流电源为直接转矩控制的感应电机驱动(DTCIMD)负载供电。该方案使用星形连接的自耦变压器产生12个脉冲，灵活地调节其电压比，这使得它适用于使用6脉冲二极管桥式整流器的改造应用。采用所提出的24脉冲交直流变换器，在交流电源电流中消除了高达21阶的谐波电流。本文还给出了一组输入交流市电的电能质量指标，以比较DTCIMD与6脉冲和12脉冲交流直流变换器的性能。研究了负载变化对DTCIMD馈电24脉冲交直流变换器的影响，验证了所提出的交直流变换器的有效性。

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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Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010

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