异步电机直接转矩控制快速正反转控制策略  

Control Strategy of Quickly Reversion Function in Induction Motor DTC System

作　　者：喻寿益[1] 汪少军[1] 贺建军[1] 桂卫华[1] 

机构地区：[1]中南大学信息科学与工程学院,湖南长沙410083

出　　处：《控制工程》2010年第5期682-685,共4页Control Engineering of China

基　　金：国家自然科学基金资助项目(60574030)

摘　　要：针对传统的异步电机正反转方法过渡时间长、定子电流畸变严重和转矩脉动大等缺点,研究异步电机直接转矩控制系统正反转过程,提出一种实现快速正反转控制策略。该策略通过控制定子磁链和转子磁链的位置关系,在异步电机制动阶段,控制定子磁链滞后转子磁链旋转,动态保持磁通角恒定,使电机产生最大允许制动转矩,转速迅速下降;在反向启动阶段,控制定子磁链超前转子磁链反向旋转,动态保持磁通角恒定,使电机输出反向最大允许启动转矩,转速迅速上升,从而实现电机快速正反转过程。在整个反转过渡过程中限制定子电流不超过设定值,在不同的控制阶段施加合适的六边形工作电压空间矢量,易于实现。通过仿真验证了该控制策略可实现异步电机直接转矩控制系统的快速正反转过程。To the problems of long transitional process,serious distorted stator current and large torque pulsation in traditional reversed rotating method of induction motor,a control strategy is presented for realizing quickly reversion function in induction motor DTC system.The controll strategy is based on the position relationship between stator flux and rotor flux.At motor braking stage,a proper voltage space vector is given to keep stator flux rotating after rotor flux,and by regulating flux-angle motor outputs invariable braking torque dynamically.At motor reversion start stage,the stator flux is controlled to rotate ahead of rotor flux,and motor outputs invariable start torque by regulating flux-angle dynamically.The stator current is limited under a setting value in the whole process.It is easy to realize the control strategy by giving motor proper voltage space vector in different transition stages,without complex calculation.A Matlab/Simulink-based simulation verifies the feasibility of the proposed control strategy.

关 键 词：直接转矩控制 制动 反向启动 定子磁链控制 

分 类 号：TP27[自动化与计算机技术—检测技术与自动化装置]