基于离散小波变换的永磁同步电机速度控制研究

针对永磁同步电机驱动系统转速快响应和强鲁棒性的速度控制需求,在分析永磁同步电机数学模型和离散小波变换技术的基础上,设计了最优小波函数为"db4",分解级数为2的永磁同步电机离散小波变换速度控制器,并基于Matlab/Simulink仿真平台,建立了永磁同步电机(Permanent Magnet Synchronous Motor, PMSM)驱动系统仿真模型和控制系统代码模型,结合基于TMS320F2812 DSP(Digital Signal Processing)的永磁同步电机驱动系统实验平台,通过负载扰动工况仿真、空载阶跃输入工况仿真与实验来验证永磁同步电机离散小波变换速度控制器的性能.仿真和实验结果表明:相比于传统比例积分微分(Proprotional Integral Derivative, PID)速度控制器,离散小波变换速度控制器达到稳态转速的速度更快,动态性能更优;在负载突变时,转速跌落小,抗负载扰动能力更强,是一种提升永磁同步电机速度控制器鲁棒性和稳定性的有效方法.

Research of Speed Control for Permanent Magnet Synchronous Motor Based on Discrete Wavelet Transform

In order to meet the requirement of quick response and strong robustness for PMSM(Permanent Magnet Synchronous Motor) speed control, after analyzing the mathematical model of PMSM and discrete wavelet transform algorithm, a speed controller was designed with an optimal mother wavelet transform function of "db4" and a decomposition level of 2. Based on the Matlab/Simulink simulation platform, a PMSM drive system simulation model and a control system code model were established, and using the experiment platform based on the TMS320F2812 DSP(Digital Signal Processing) of permanent magnet synchronous motor drive system, the performance of the discrete wavelet transform speed controller was verified by simulation and experiment. The simulation and experiment results indicated that compared with the traditional PID(Proprotional Integral Derivative) controller, the discrete wavelet transform speed controller improved the dynamic response speed to get to a steady state and, when the load abruptly changed, it showed a small speed drop and had strong anti-load-disturbance ability. Therefore, it is an effective method to promote the robustness and stability of permanent magnet synchronous motor speed control.