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摘要
In order to improve the stability and reliability of the traction system of high-speed train, this paper proposes a simultaneous diagnosis method for broken rotor bar fault and speed sensor fault of traction motor based on the unknown input observer. Firstly, through non singular coordinate transformation, the traction motor system is decoupled into two subsystems that only contain broken rotor bar fault and speed sensor fault, respectively, so as to realize the decoupling of broken rotor bar fault and speed sensor fault, and the subsystem containing speed sensor fault is further transformed into augmented system by using first-order low-pass filter. Then, the unknown input interval observer and the unknown input sliding mode observer are designed for the subsystem with broken rotor bar fault and the speed sensor fault augmentation system, respectively. On this basis, the upper and lower bounds of the unknown input interval observer are used to construct the detection variables and adaptive thresholds for broken rotor bar fault diagnosis, and the speed sensor fault estimation is realized by using the equivalent output control principle of the unknown input sliding mode observer. Finally, the effectiveness and robustness of the proposed method are verified by simulation and TDCS-FIB platform experiments. ? 2023 Science Press.
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