摘要
针对常规直接转矩控制方法存在开关频率不恒定和转矩脉动较大的问题,采用了一种基于恒定开关频率的内置式永磁同步电机直接转矩控制方法,该方法由一个PI调节器和一个三角波载波器组成,通过比较PI转矩调节器的输出与固定频率载波信号,实现了逆变器开关频率恒定,从而使电机的转矩脉动明显降低并改善了电流波形畸变;并对所提出的转矩调节器提供了详细的数学建模过程和小信号稳定性分析。仿真结果表明该算法在保持快速动态响应的前提下,可有效改善内置式永磁同步电机直接转矩控制系统的稳定运行特性,同时开关频率几乎处于恒定状态。
The traditional direct torque control(DTC)of interior permanent magnet synchronous motor(IPMSM)suffers from two major problems of variable switching frequency and large torque ripples. A constant switching frequency-based DTC algorithm for IPMSM drives is proposed in this paper. The method consists of one PI regulator and one triangular-wave carrier. The switching frequency of the inverter is constant by comparing the output of the PI torque regulator with the fixed frequency carrier signal, which effectively reduces the torque ripple in the motor operation and improves the current distortion;and a detailed mathematical modeling process and a small signal stability analysis are provided for the proposed torque regulator. Simulation results show that the proposed algorithm can effectively improve the steady-state operating performance of the direct-torque control system of the interior permanent magnet synchronous motor, and the switching frequency of the system remains approximately constant under the premise of maintaining a fast dynamic response.
作者
李永钦
王海云
王亮
刘中原
Li Yongqin;Wang Haiyun;Wang Liang;Liu Zhongyuan(Engineering Research Center of Ministry of Education for Renewable Energy Power Generation & Grid Technology,School of Electrical Engineering,Xinjiang University,Urumqi 830047,China)
出处
《电测与仪表》
北大核心
2019年第14期96-102,共7页
Electrical Measurement & Instrumentation
基金
国家自然科学基金资助项目(51667020)
关键词
恒定开关频率
载波器
控制器稳定性
直接转矩控制
转矩脉动
内置式永磁同步电机
constant switching frequency
carrier
controller stability
direct torque control
torque ripple
interior permanent magnet synchronous motor
