一种改进式无刷双馈电机三电平直接转矩控制算法

针对无刷双馈电机直接转矩控制算法转矩脉动和磁链脉动大的问题，基于固定合成矢量方法提出了一种改进式无刷双馈电机三电平直接转矩控制算法，增加了空间电压矢量的可选择性，使得磁链脉动和转矩脉动控制在较小的范围内.在Matlab/Simulink软件平台上搭建了无刷双馈电机三电平直接转矩控制算法模型，并对改进式三电平直接转矩算法进行了验证.实验结果表明，该算法有效地减小了磁链脉动和转矩脉动，获得了更好的磁链轨迹和转矩波形，电机转速更加稳定，同时保持直接转矩控制算法转矩响应速度快的优点，提高了控制系统的鲁棒性和动态性能.

An Improved Three Level Direct Torque Control Method of Brushless Doubly Fed Machine

To solve the problem of high amplitude ripples of stator flux linkage and torque in the traditional three level direct torque control(DTC) algorithm for brushless double fed machine(BDFM)， an improved three level direct torque algorithm for brushless doubly fed machines based on fixed synthesizing vectors was presented. The selectivity of voltage vector was added in order to deduce the torque ripple and the flux linkage ripple. A simulation model of three level DTC algorithm for BDFM was established in Matlab/Simulink software environment and the effectiveness of the proposed control algorithm was testified in this model. The simulation results show that the torque ripples and the flux linkage ripples were effectively reduced， the locus of the stator flux linkage was better and the rotor speed was more stable by this improved control method. In addition， the advantage of fast torque response in the DTC algorithm was maintained. The dynamic performance and robustness was improved in this DTC system.