摘要
构建了基于二极管钳位式三电平逆变器的直接转矩控制仿真系统。针对直接转矩控制系统存在的转矩脉动、中点电位平衡和电压跳变等问题,优化了三电平矢量选择方法。为了解决U-I和I-N磁链观测模型易受定、转子参数和转子角速度精确度的影响,系统采用了全速度范围的U-N模型,提高了定子磁链观测的精确度。最后通过Simulink仿真验证了该模型的正确性和该算法的可行性。
A direct torque control simulation system was constructed based on Diode-Clamped three-level inverter. Against the problems of torque ripple, the midpoint potential balance and voltage jump, an optimized three-level vector selection methods was proposed. In order to reduce influence on the precision, of the U-I and I-N flux observer model resulted in the stator-rotor parameters and the rotor angular speed, the entire speed range U-N model was used, to improve the accuracy of flux observer. Finally, the simulation results showed the correctness of the model and the feasibility of the algorithm.
出处
《电机技术》
2010年第4期21-24,共4页
Electrical Machinery Technology
关键词
三电平逆变器
直接转矩控制
U-N磁链观测
异步电机
Three-level inverter Direct Torque Control U-N flux observer model Asynchronous Motor
