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基于连续型定子磁链轨迹的异步牵引电机低转矩脉动控制算法

, PP. 228-236

Keywords: 直接转矩控制,异步牵引电机,减小转矩脉动,优化磁链轨迹,基速

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Abstract:

本文提出了一种定子磁链轨迹优化的异步牵引电机基速以内的中高速区直接转矩控制(DirectTorqueControl,DTC)算法.所提出DTC算法是从以改善转矩脉动角度出发,牵引电机在基速以内的中高速度运行阶段时,随着转速的增加,通过实现定子磁链轨迹从圆形-多边形-六边形的连续切换,获得转矩脉动小与平稳,磁链轨迹平滑,开关频率利用率以及谐波消除能力等的提高.该DTC算法仅需在传统DTC基础结构上仅增加定子磁链调节算法即可,因此它的主要优点是算法简单性,并保留了传统DTC算法快速动态响应,控制电路不复杂,对电机参数依赖性低等特征.理论分析和实验结果都证明了该连续型磁链轨迹的DTC算法的有效性和可行性.

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