Active Disturbance Rejection Speed Control Strategy of PMSM Based on Improved Extended State Observer
In order to enhance the robustness of permanent magnet synchronous motor servo system to load disturbance,motor parameter perturbation and other working conditions,an improved active disturbance re-jection speed loop control strategy is proposed. The cascaded nonlinear extended state observer is designed to estimate the total disturbance of the system,NESO1 observes the disturbance of the system,and NESO2 takes the NESO1 observation disturbance as the known part to observe the residual disturbance,which re-duces the observation error of the traditional nonlinear extended state observer to the disturbance. Aiming at the problem that the traditional nonlinear fal function has a non-smooth and continuous inflection point,which is easy to cause system tremor,a newfal nonlinear function is designed and applied to the improved structure of cascaded NESO. The model is built based on MATLAB/Simulink platform. The simulation re-sults show that the improved ADRC has strong robustness to speed change,load disturbance and parameter perturbation. Compared with the traditional ADRC,the speed steady-state error,load mutation change value and recovery time of the newfal-CADRC are reduced by about 36％,59％ and 66％ respectively. Finally,it is verified on the 1 kW actual system platform. The comprehensive simulation and physical experiment fully prove that the improved control strategy has good robustness to load disturbance and slope load disturbance,and has good resistance to parameter perturbation and noise influence.
permanent magnet synchronous motoractive disturbance rejection controlcascade extend state observenonlinear function
万方数据
维普
