Fast and accurate open-circuit fault diagnosis method for PWM voltage source inverters in the three-phase PMSM control systems

Jun Sun, Min Zhu, Xinxiu Zhou, Yufei Xu, Yi Xu
2019 Journal of Physics, Conference Series  
Traditional fault diagnosis methods for converter open-circuit faults may present poor anti-interference performance, low detection speed and high misdiagnose rate especially during the motor acceleration. In order to solve the above problem, a new converter single open-circuit faults diagnosis method is proposed in this paper. Firstly, though conducting differential operation for the current variables, the common mode interference can be removed. Based on the differential information,
more » ... formation, differential currents states observer is designed, which improves the anti-jamming performance of the diagnosis method. Secondly, to avoid misdetection, a variable fault detection threshold is designed. This kind of faults diagnosis method does not need additional sensors or hardware change, and does not require the motor phase currents to be sinusoidal. Besides, the detection index rises rapidly once the fault occurs. Therefore, the application range, detection accuracy, and fault detection speed can be improved simultaneously. Finally, experimental results are presented to demonstrate the correctness of the analysis and the validity of the proposed methods.
doi:10.1088/1742-6596/1303/1/012114 fatcat:ixm42rxpn5d27a3poffg2lwmyy