基于一种指数趋近律的PMSM滑模变结构控制

Sliding Mode Variable Structure Control of PMSM Based on Novel Exponential Rate Reaching Law

在永磁同步电机矢量优化控制调速系统的研究中,为改善常规指数趋近律对系统鲁棒性的不利影响,并消除由于滑模变结构控制对系统造成的抖振,通过趋近律与速度误差变量相关联,从而来提高系统快速性,分析传统趋近律参数的选取对系统的影响,并进行简化。通过可变的加权因子将改进的趋近律控制模块与PI控制模块相结合对电机进行控制。仿真表明,改进的控制系统与传统控制方法相比,抖振减小,动、静态特性与鲁棒性明显提高。

A novel variable exponent reaching law was proposed to vector control system of PMSM, to improve the effect of the robustness of this system by the conventional exponential reaching law. The novel reaching law was associated with the changes of the speed error, to improve the system speed. The influence of the parameters of the conventional reaching law on the system was analysed to simplified it. A novel controller was combined with the novel reaching law control and PI control module by the variable weighted factor to control the motor. Simulation show that, compared with the traditional method, the chattering in the improved system decreases, the steady and dynamic performances and robustness characteristics of speed servo system are significantly improved.