Control Strategy for Permanent Magnet Synchronous Motors Based on a New Dual Sliding Mode Structure
Aiming at the problems of speed overshoot,strong chattering and poor robustness in the traditional sensorless vector control system of permanent magnet synchronous motor,a new full-order sliding mode observer(NFSMO)with a variable boundary layer segmentation function as the switching function was proposed in the position loop and a fuzzy control module was introduced to achieve adaptive adjustment of the boundary layer of the new switching function,so that the high frequency jitter problem of the system can be effectively weakened and the rotor position observation accuracy was improved.Secondly,a new convergence law combined with an improved extended state observer(IESO)was proposed in the speed loop as a new speed sliding mode anti-disturbance controller(NSMDC),which combined the maximum torque-to-current ratio(MTPA)fitting module to effectively reduce the influence of disturbance errors on the system and improve the steady state performance.Simulation results show that the new dual-sliding-mode control method is not only effective in improving the sliding-mode jitter of the system,but also has better immunity and stability than the conventional method.
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维普
