基于滑模速度控制的PMSM矢量控制策略

Vector Control Strategy Research of Permanent Magnet Synchronous Motor Based on Sliding Mode Velocity Control

针对永磁同步电机采用传统滑模控制算法时存在滑模抖振、超调较大、抗扰动能力差等问题,提出一种新型混合趋近率的滑模变结构控制策略。在传统指数趋近率的等速项中引入以转速误差作为关联变量的对数函数,降低空载启动的超调现象,加快趋近速度;采用更加平滑的双曲正切函数取代符号函数,有效抑制系统抖振,并利用Lyapunov函数验证了新型趋近率的稳定性,新型滑模控制策略显著提高了系统的鲁棒性和稳定性。

In order to solve the problems such as sliding mode chattering,large overshoot and poor anti-disturbance ability for permanent magnet synchronous motor,a new sliding mode variable structure control algorithm with mixed reaching law is proposed.The logarithmic function with the speed error as the correlation variable is introduced into the constant velocity term of the traditional exponential approaching law to reduce the overshoot phenomenon of no-load starting and accelerate the approaching speed.And a smoother hyperbolic tangent function is used to replace the sign function to effectively suppress system chattering.Lyapunov function is used to verify the stability of the new approach law.The new sliding mode control strategy significantly improves the robustness and stability of the system.