摘要
针对内嵌式永磁同步电机在低开关频率下高速深度弱磁区电流畸变、转矩波动大等问题,分析了电机常规控制下系统对扰动信号的抑制作用;常规SVPWM过调制运行时会产生周期性扰动,结合试验及仿真数据,提出采用特定谐波消除SHEPWM调制抑制电流谐波的控制策略,改善了电机平稳运行能力。对所提出的优化脉冲模式进行Matlab仿真和试验验证,结果表明:采用特定谐波消除SHEPWM调制模式,可以有效抑制电机高速弱磁区的电流谐波,改善了系统稳态转矩控制效果。
Aiming at the problems of embedded permanent magnet synchronous motor at low switching frequency, such as current distortion of high speed deep weak magnetic field and large torque ripple, it analyzed the inhibitory effect of conventional motor control system on disturbance signal. As periodical disturbance would be generated in conventional SVPWM over modulation operation, combining experiment and simulation data, it put forward a control strategy using a selective harmonic elimination modulation（SHEPWM） to realize current harmonic suppression, so that the motor stable operation ability could be improved. Matlab simulation and experimental verification were implemented for the proposed optimal pulse mode. The results show that it can effectively inhibit current harmonic of motor in high-speed week magnetic fields and can improve control effect of the system steady-state torque by the method of SHEPWM.
出处
《大功率变流技术》
2016年第6期1-6,30,共7页
HIGH POWER CONVERTER TECHNOLOGY
关键词
永磁同步电机
低开关频率
电流谐波
permanent magnet synchronous motor
low switching frequency
current harmonic
