摘要
永磁同步电机直接转矩控制系统低速运行时存在周期性转速脉动,限制了其在高性能伺服方面的应用。针对该问题,分析了系统转速脉动产生原因及其周期性,提出了在传统速度环PI控制器的基础上增加谐波转矩注入抑制转速脉动的方法。该方法通过对转速反馈信号进行快速傅里叶变换,得到转速脉动的各次谐波含量,针对主要的谐波含量增加PI控制器,并与原控制嚣共同组成直接转矩控制的转矩给定信号。仿真和实验结果表明了该方法有效地抑制了周期性转速脉动,提高了系统的伺服性能,且该方法的结构及算法简单,无需对原控制器作硬件改动,便于工程实现。
Because of robust structure and fast torque response, the use of permanent magnet synchronous motors with direct torque control （PMSM-DTC） increases in high performance servo applications where the speed smoothness is essential. To minimize the speed ripple of PMSM-DTC system, the main com- ponents of speed ripple were analyzed and its periodic characteristic was described, and a new torque harmonic injections algorithm adding to the speed loop was proposed. The speed harmonics were detect- ed by means of the fast Fourier transformation （FFT）, and the torque harmonic injections were derived by adding the speed harmonics PI controllers to the original speed loop. The torque reference signal of DTC contains two parts： the output of the original speed controller and the torque harmonic injections. The simulation and experimental results of the proposed algorithm show that the speed ripple are effectively minimized as compared to the traditional PI controller. This algorithm needs a small amount of software changes to the original system, and both of the structure and algorithm are simple.
出处
《电机与控制学报》
EI
CSCD
北大核心
2013年第9期73-78,85,共7页
Electric Machines and Control
基金
高等学校博士学科点专项科研基金(20106102110032)
关键词
永磁同步电机
直接转矩控制
转速脉动
谐波转矩注入
快速傅里叶变换
permanent magnet synchronous motors
direct torque control
speed ripple
torque harmonicinjection
fast Fourier transform
