基于新型负载观测器的PMSM控制

PMSM Control Based on Improved Load Observer

摘要: 针对传统滑模观测器(Traditional Sliding Mode Observer, TSMO)固定增益和符号函数导致系统出现的抖振和稳定性问题，本文提出一种变结构改进型滑模观测器(Variable Structure-Improved Sliding Mode Observer, ISMO)用于观测负载转矩的变化。本文先是提出一种自适应增益趋近律，在此基础上设计了一种改进滑模观测器(Improved Sliding Mode Observer, ISMO)，实现削减传统趋近律中因符号函数不连续性所引起的抖振现象的同时提高收敛速度，为消除抖振信号在其中加入解耦项，设计了一种用于负载转矩观测的变结构改进滑模控制器，这样不仅可以消除估计负载转矩中的抖振信号，还可以消除待估计参数与转速估计误差导数之间的耦合关系。实验结果表明，该方法具有估计精度高、收敛速度快、辨识值不含抖振信号等优点。

Abstract: A Variable Structure-Improved Sliding Mode Observer (ISMO) is proposed to observe the change of load torque in order to solve the chattering and stability problems caused by the fixed gain and symbolic function of traditional sliding mode observers. An Adaptive Gain Sliding Mode Law (AGSML) is designed, based on which an Improved Sliding Mode Observer (ISMO) is designed. In order to reduce the chattering phenomenon caused by the discontinuity of the symbolic function in the traditional approach law, and improve the convergence speed, a variable structure modified sliding mode controller for load torque observation is designed to eliminate the coupling relationship between the parameters to be estimated and the error derivative of the speed estimation and the chattering signal in the load torque estimation. The experimental results show that the proposed method has the advantages of high estimation accuracy, fast convergence speed and no buffeting signal.