摘要
针对永磁同步电机调速系统中PI控制器无法满足高精度控制要求的问题,提出了一种基于新型趋近律的滑模变结构控制方法。该趋近律在指数趋近律和幂次趋近律的基础上,加入了系统状态变量,有效地抑制滑模控制器在滑动阶段的抖振;等速趋近项与滑模面切换函数关联,保证其在s=0附近有效地稳定趋近,削弱抖振;指数趋近项与系统状态变量x1关联,提高趋近速度。采用李雅普诺夫函数对其进行稳定性分析。经过与PI速度控制器以及传统的滑模控制器进行仿真比较,分析了空载起动、突加负载和变速运动3种情况下的控制效果,结果表明:采用新型滑模控制器可实现快速稳定趋近,并具有稳定性高、抗负载扰动能力强的优点。
In the speed control system of permanent magnet synchronous motor (PMSM), PI controller could not meet the requirements of high precision control. A sliding mode variable structure control method based on a new reaching law is proposed. The new reaching law combined the advantages of exponential reaching law and power reaching law, and with the addition of system state variables, it could effectively suppress the chattering of sliding mode controller in the sliding stage. The constant velocity approaching term was related to the sliding surface switching function, which ensured the effective and steady approaching of the reaching law near s =0 and weakened chattering;the exponential approaching term was associated with the system state variable x 1 to increase the approaching speed. The stability of the proposed method was proved by using the Lyapunov stability theory. The speed controller based on the new sliding mode algorithm was compared with the PI speed controller and the traditional sliding mode controller by simulation. The simulation results under the no-load start, sudden load and variable motion conditions showed that the system using this controller could achieve rapid response, high stability and strong resistance to load disturbance.
作者
朱笋
洪荣晶
李盛寅
ZHU Sun;HONG Rongjing;LI Shengyin(College of Mechanical and Poner Engineering, Nanjing Tech University, Nanjing 211800, China)
出处
《电机与控制应用》
2019年第5期58-63,共6页
Electric machines & control application
基金
江苏省科技成果转化专项资金项目(BA2017099)
关键词
永磁同步电机
滑模变结构控制
速度控制
新型趋近律
permanent magnet synchronous motor (PMSM)
sliding mode variable structure control
speed control
reaching law
