一种中高速区转矩优化的异步电机直接转矩控制算法  

A Direct Torque Control Algorithm of Asynchronous Motors With Torque Optimization in Medium and High Speed Regions

作　　者：范文进[1] 郑琼林[1] 杨中平[1] 林飞[1] 宋文胜[2] DO Viet Dung 

机构地区：[1]北京交通大学电气工程学院,北京市海淀区100044 [2]西南交通大学电气工程学院,四川省成都市610031 [3]交通运输大学机械系

出　　处：《中国电机工程学报》2016年第1期240-249,共10页Proceedings of the CSEE

摘　　要：提出一种在异步电机基速内转矩性能优化的直接转矩控制(direct torque control,DTC)算法。该算法在中高速段采用连续定子磁链轨迹切换技术实现了各段定子磁链轨迹平滑切换。随着电机转子速度的升高,定子磁链轨迹依次从圆形、多边形及六边形连续与平滑地切换,算法具有电机转矩脉动小,电机转矩平稳等特点;在高速区段,给出一种非零电压矢量提前注入的控制方案,实现了减小转矩向下脉动,因此有效提高了转矩平均值与转矩平稳性。该DTC算法仅需在传统DTC结构中增加调节定子磁链和调节电压矢量作用时刻算法,既保留了传统DTC算法快速动态响应,以及对电机转子参数不敏感等特征,又确保控制系统较低的计算量要求。理论分析和实验结果都证明了该DTC算法的有效性和可行性。A direct torque control（DTC） algorithm of asynchronous motors was proposed to optimize the torque performance in the base speed region. In the medium speed range of motors, based on the continuous stator flux-linkage track control in the DTC algorithm, the stator flux-linkage track can be smoothly switched from roundness to polygons, and hexagon at last, with the advantage of steady torque response and small torque ripple. Furthermore, in the high speed range of motors, a modulation strategy with advanced non-zero voltage vector inject was proposed to achieve a smaller minus value of torque ripple; hence the average torque value is increased and the stability of torque response is improved. The advantages of the control performances of the proposed control strategy are both fast system response and easy realization; it also retains advantages of the traditional DTC algorithm. Both theory analysis and experimental results verify the effectiveness and feasibility of the proposed DTC method with optimizing the stator flux-linkage locus and improving the torque performance.

关 键 词：直接转矩控制 异步电机 连续定子磁链轨迹 转矩优化 基速 

分 类 号：TM351[电气工程—电机]