一种具有中点平衡功能的三电平异步电机直接转矩控制方法  

A DTC Algorithm of Induction Motors Fed by Three-level Inverter With Neutral-point Balancing Control

作　　者：林磊[1] 邹云屏[1] 王展[1] 金红元[1] 邹旭东[1] 钟和清[1] 

机构地区：[1]华中科技大学电气与电子工程学院,湖北省武汉市430074

出　　处：《中国电机工程学报》2007年第3期46-50,共5页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50277017)~~

摘　　要：对三电平逆变器供电异步电机直接转矩控制(DTC)系统进行了研究。以固定合成矢量为基础,提出了一种三电平异步电机DTC控制方法,并使用基于三相输出电流方向及中点不平衡方向检测的中点平衡Bang-Bang控制方法来控制中点电位平衡。使用文中的DTC方法,可以抑制三电平直流侧中点不平衡,限制输出电压dv/dt,减小开关损耗,同时获得良好的电机调速特性。实验结果证明了该控制方法的可行性。The paper mainly focuses on the direct torque control （DTC） system of induction motors fed by three-level inverter. Based on the fixed synthesizing vectors, an induction motors DTC method fed by three-level inverters is proposed. And then, the neutral-point balancing Bang-Bang control method, which is based on the detection of each phase leg current＇s and neutral-point voltage ripple＇s direction, is employed to make neutral-point potential balance. With the proposed DTC strategy, the neutral-point voltage unbalance, the dvldt of output voltage and the switching loss is restrained. Furthermore, it does not deteriorate the performance of DTC schemes. The experimental results verify the correctness and feasibility of the proposed control scheme.

关 键 词：异步电机 三电平逆变器 直接转矩控制 固定合成矢量 中点平衡 Bang—Bang控制 

分 类 号：TM310[电气工程—电机]