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Application Research Of Sliding Mode Control And Observer In Permanent Magnet Synchronous Motor Control System

Posted on:2021-03-19Degree:MasterType:Thesis
Country:ChinaCandidate:X S HuFull Text:PDF
GTID:2392330602994071Subject:Control science and engineering
Abstract/Summary:PDF Full Text Request
With the development of modern motor control methods and the improvement of national industrial technology,the application field of permanent magnet synchronous motor(PMSM)is expanding,so the performance requirements of PMSM will be higher and higher.The advanced control algorithm is of great significance to improve the control performance of PMSM.Sliding mode control algorithm has become one of the most important algorithms for controlling PMSM system because of its strong robustness,not easily affected by external disturbance and internal parameter time-varying.In order to ensure the strong robustness of the sliding mode control and reduce the chattering phenomenon,based on the traditional exponential approach law,the switching gain is used and an improved exponential approach law is proposed.Then,the current and speed loops,which usually adopt conventional PI algorithm,aredesigned three sliding mode controllers based on the improved exponential approach law.Compared with the traditional sliding mode control method,the effectiveness of the improved exponential approach law can reduce chattering is verified.Consider how to suppress comprehensive disturbances and reduce the influence of uncertain factors on system accuracy,the active disturbance rejection control(ADRC)and sliding mode control are combined to redesign the current and speed controllers of PMSM.In the feedback link of ADRC,a nonlinear sliding mode control law is used,and a nonlinear disturbance observer is used to estimate the comprehensive disturbance,which simplifies the parameter tuning of the extended state observer.Simulation results show that this method can improve the anti-interference ability and dynamic and static performance of PMSM control system.Finally,the paper studies the sensorless control of PMSM.The traditional sliding mode observer(SMO)may transfer the chattering indirectly when it estimating the back EMF,and leads to a larger estimation error to affect the system performance,ahierarchical SMO is proposed to solve this problem.The front stage uses,the back EMF is estimated by the extended state observer to avoid the influence of high frequency buffeting on the accuracy of the estimated value.In the subsequent stage,the sliding mode observer is used to obtain the information of speed and rotor position,and the hyperbolic tangent function is used to replace the sign function to reduce the chattering of the system.The simulation results show that the PMSM auto-disturbance sliding mode control system based on thismethod has good anti-interference ability and accurate tracking performance,suppresses chattering phenomenon,presents better speed regulation characteristics as a whole,and improves the control performance of PMSM control system.
Keywords/Search Tags:Permanent magnet synchronous motor, Sliding mode control, Active disturbance rejection control, Nonlinear disturbance observer, Sliding mode observer
PDF Full Text Request
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