Abstract
Due to the use of multiple observers and controllers in multi-sensor fault-tolerant control of PMSM drive systems, the algorithm is complex and the system control performance is affected. In view of this, the paper studies multi-sensor fault diagnosis and active fault-tolerant control strategies based on a composite sliding mode observer. With the mathematical model of PMSM built, a design method of the composite sliding mode observer is proposed. A single observer is used to observe and estimate various state variables in the system in real time, which simplifies the implementation of observer-related algorithms. In order to improve the diagnostic accuracy of different types of sensors under different faults, a method for determining fault thresholds is proposed through global search for the maximum residual value. Based on this, a fault diagnosis and active fault-tolerant control strategy is proposed to realize fast switching and reconstruction of feedback signals of closed-loop control systems under different faults of multiple sensors, thus restoring the system performance. Finally, the effectiveness of the proposed algorithm and control strategy is verified by simulation experiments
Highlights
With the increasing use of electric vehicles worldwide, the industry’s technical requirements for its core component—the electric drive system—continue to increase [1]
The PermanentMagnet Synchronous Motor (PMSM) drive system is equipped with current, speed and position sensors to obtain the feedback signals of three-phase stator current, motor speed and position, which are required for the closed-loop control operation of the system
When the sensor of the PMSM drive system is free of faults, the system enters into the sliding mode and the state estimation error converges
Summary
With the increasing use of electric vehicles worldwide, the industry’s technical requirements for its core component—the electric drive system—continue to increase [1]. Research mainly focuses on the establishment of multiple observers based on analytical model methods to realize multi-sensor fault diagnosis and fault-tolerant control of PMSM drive system [14,15]. The three observers operated in parallel so as to realize diagnosis and fault-tolerant control of the voltage, current and speed sensor faults of the PMSM drive system Though it enhanced the robust performance of the system, the integral effect of the high-order sliding mode had an impact on the fast response characteristics of the system. (2) During system operation, the composite sliding mode observer estimates, in real time, the three-phase current and speed signals in the system, and inputs the corresponding estimated values and the measured values of the sensor altogether into the fault diagnosis module.
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