基于固定合成矢量的高性能三电平异步电机直接转矩控制系统研究  

Study of High Performance DTC Algorithm of Induction Motors Fed by Three-level Inverter Based on Fixed Synthesizing Vector

作　　者：林磊[1] 邹云屏[1] 张杰[1] 张允[1] 黄朝霞[1] 

机构地区：[1]华中科技大学电气与电子工程学院,武汉430074

出　　处：《电源世界》2008年第6期27-32,共6页The World of Power Supply

摘　　要：针对具有中点电位平衡功能的三电平异步电机直接转矩控制(DTC)方法会引起较大的定子磁链和转矩脉动的缺点,改进固定合成矢量的合成方式,提出了适用于高性能三电平异步DTC系统的"24矢量"法和"24矢量+变调制比"法。从磁链、转矩控制性能的角度出发,分析了它对电机性能改善的贡献。这两种方法物理概念清晰、结构简单、易于实现,且保留了原固定合成矢量方法的优点。实验结果证明了控制方法的可行性。The direct torque control （DTC） algorithm of induction motors fed by three-level inverters with neutral-point balancing control has a shortcoming, high amplitude ripple of stator flux linkage and torque. To solve this problem, the synthesizing technique is modified. The “24 vectors” method and “24 vectors＋alter modulation index” method, which are suitable for high performance DTC system fed by three-level inverters, are proposed. From the viewpoint of flux and torque control effect, the improvements by the proposed schemes are analyzed. These methods have some merits, such as vivid physical concept, simple construction, easily implementation. Besides, the merits of former method are preserved. The experimental results verify the feasibility of the schemes.

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 定子磁链脉动 转矩脉动 “24矢量”法 “24矢量+变调制比”法 

分 类 号：TN773[电子电信—电路与系统]