Abstract
The model predictive current control (MPCC) method has been widely used in permanent magnet synchronous motor (PMSM) drive systems for excellent dynamic performance. The fault diagnosis of the PMSM drive system becomes as important as dynamic performance improvement. The open-circuit fault of the semiconductor power switches is commonly seen in the PMSM drive system, which causes safety issues due to the abnormal operation of the system if the fault has not been detected. However, the previous fault diagnosis methods are mainly aimed at PMSM drive systems with conventional control methods. Focused on PMSM drive system with MPCC method, a diagnosis method of semiconductor power switch open-circuit fault has been proposed. The calculated result of the cost function in implementing the MPCC algorithm has been picked as the primary characteristic parameter for fault diagnosis, which is derived through comparative analysis of the operation in fault conditions with normal conditions. In addition, the monitored stator current and the gate-driving signals of the switches are used as subordinate fault characteristic parameters. The selected three fault indices together with a digital filtering algorithm complete the switches' open-circuit fault diagnosis. A MATLAB/Simulink model has been built to validate the effectiveness of the proposed fault diagnosis method. The simulation results verify the proposed method's robustness against the operating point and parameter mismatch of the PMSM drive system.
Highlights
The permanent magnet synchronous motor (PMSM) has been widely used in electric vehicles, aircraft, and other industrial fields due to its high power density, high torque density, and high efficiency [1]–[3]
The abnormality of the PMSM drive system is detected by the cost function, and the faulty switch is identified based on the stator current and the drive signal of the power switcher
For diagnosis in fault conditions, the threshold gth and dth is determined based on the cost function g0 max and the deviation i0 max under 0 Nm operation condition
Summary
The permanent magnet synchronous motor (PMSM) has been widely used in electric vehicles, aircraft, and other industrial fields due to its high power density, high torque density, and high efficiency [1]–[3]. The diagnosis of power switch open-circuit fault presented in the previous literature review is suitable for the PMSM drive system with the conventional control method. This paper based on the fault signal analysis proposes a diagnosis method of semiconductor power switch open-circuit fault for the PMSM drive system with the MPCC method. The abnormality of the PMSM drive system is detected by the cost function, and the faulty switch is identified based on the stator current and the drive signal of the power switcher This method does not require additional hardware and makes full use of the signals in the control strategy, including cost function, three-phase current, and driving signals.
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