Research on sensorless fault-tolerant control algorithm for interior permanent magnet synchronous machine under sensor fault conditions
In order to solve the problem that the current sensors may malfunction in permanent magnet synchronous machine ( PMSM) drives,a phase current reconstruction algorithm with variable parameters was proposed to accurately estimate the stator current and realize fault-tolerant control of the current sen-sor under the position sensorless control of PMSM.The influence of non-ideal factors such as motor pa-rameter variation and sensorless control strategy estimated error on the accuracy of directly constructed Luenberger observer was studied.The amplitude error and angle error characteristics of the estimated cur-rent were analyzed.Two adaptive parameters were introduced to adjust the amplitude of the reconstructed current,and the influence on non-ideal factors on the accuracy of the reconstructed current can be elimi-nated.A simulation and experimental platform were built to verify effectiveness of this algorithm.The ex-perimental results show that after the current sensor malfunctions,the estimated error of electric angle is only increased by 1°,and the peak-to-peak value of dq axis current ripple is only increased by 0.1 A.The algorithm can accurately estimate the speed,position and current information of the motor,and the system has good steady-state accuracy and dynamic performance.
permanent magnet synchronous machinesensorless controlcurrent sensorfault-tolerant controlcurrent state observerphase current reconstruction
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