快速虚拟矢量调制的三电平直接转矩预测控制  

Three-level direct torque predictive control based on fast virtual vector modulation

作　　者：王明渝[1] 邓威[1] 陈杨裕[1] 代同振[1] 安树怀[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《重庆大学学报（自然科学版）》2010年第9期41-46,共6页Journal of Chongqing University

基　　金：重庆市自然科学基金资助项目(CSTC2007BB3169)

摘　　要：提出了一种新颖的基于电压预测和快速虚拟矢量调制算法的二极管钳位式三电平逆变器供电的永磁同步电机直接转矩控制方案。系统基于广泛应用于中高压调速系统的二极管钳位式三电平逆变器,结合空间矢量调制思想,通过电压预测控制算法生成直接转矩控制所需的参考电压矢量,然后基于非正交60°坐标系,构建虚拟矢量合成参考电压矢量,采用平衡因子调整冗余小矢量的作用时间,对中点电压进行滞后补偿控制,基本电压矢量的选取和作用时间计算十分简单,实现了快速空间矢量调制。仿真结果验证了该控制方案的可行性,三电平逆变器输出电压幅值跳变和直流侧中点电位得到有效控制,并获得了良好的动态和稳态调速性能。A novel scheme based on voltage prediction and fast virtual vector modulation algorithm for direct torque control of a permanent magnet synchronous motor fed by diode clamped multi-level inverter is proposed.The system is based on diode clamped three-level inverter,which is widely applied to middle-high voltage speed regulation.Combined with space vector modulation,the reference voltage vector for direct torque control is obtained by voltage predictive control algorithm,then zero vector and two adjacent virtual vectors are used to synthesize reference voltage vector based on non-orthogonal 60° coordinate.The neutral point potential is controlled by using the neutral-point current characteristics of small vectors,the desired basic voltages and their dwelling time can be easily obtained and fast space vector modulation is achieved.Simulation results verify the feasibility of the proposed control scheme,that dv/dt of output voltage and neutral-point potential of three-level inverter are restrained effectively,and high dynamic and steady performances are obtained.

关 键 词：三电平 预测控制系统 直接转矩控制 虚拟矢量调制 快速调制算法 交流电机 

分 类 号：TM351[电气工程—电机] TM921.2