摘要
对永磁同步电机直接转矩控制系统逆变器供电方式、控制策略以及脉宽调制算法进行改进。针对直接转矩控制系统存在磁链脉动大、转矩不稳定的问题,采用空间电压矢量调制替代传统的开关表和滞环比较器,构建由三电平逆变器供电的直接转矩控制系统。对替代两电平逆变器的三电平逆变器拓扑结构进行改进;利用对称性原则对空间电压矢量调制算法进行改进,并采用改进的自抗扰速度调节器进行速度调节。仿真实验结果验证了控制策略的有效性。
The inverter power supply mode,control strategy and pulse width modulation algorithm for permanent magnet synchronous motor direct torque control system were improved. To solve the flux linkage ripple and the torque instability in DTC system,the traditional DTC system′s switching table and hysteresis comparator were replaced by space vector pulse width modulation. DTC system supplied with three-level inverter was set up. The improved threelevel inverter was used to replace the two-level inverter,and the principle of symmetry was used to improve the SVPWM algorithm. In addition,the improved speed regulator based on ADRC was designed. Simulation results verify the effectiveness of this control strategy.
出处
《电气传动》
北大核心
2017年第11期9-15,共7页
Electric Drive
基金
国家自然科学基金项目(11472058)
国家自然科学基金项目(51477011)
关键词
永磁同步电机
三电平逆变器
自抗扰控制技术
直接转矩控制
空间电压矢量调制
permanent magnet synchronous motor(PMSM)
three-level inverter
active disturbance rejection control technique
direct torque control(DTC)
space vector pulse width modulation(SVPWM)
