Fault diagnosis method of three-phase permanent magnet synchronous motor control system
A permanent magnet synchronous motor and control system technology, applied in control systems, motor control, vector control systems, etc., can solve the problem of poor robustness, long diagnosis time, inability to distinguish and locate motor winding faults and inverter switch tube faults, etc. question
Active Publication Date: 2021-04-20
BEIHANG UNIV
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is: under the premise of not adding additional sensors, the diagnosis time of the traditional online fault diagnosis method of the motor control system is long, the robustness is poor, and it is impossible to realize the fault diagnosis of the motor winding fault and the inverter switch tube fault. Accurately distinguish and locate
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[0164] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0165] Figure 5 It is a structural diagram of the present invention, mainly including motor main control algorithm, differential current state observer, low-pass filter, fault feature extraction module, threshold value calculation module and fault diagnosis logic module, six templates, and these six modules work together , to complete the online fault diagnosis of the motor.
[0166] Algorithm flow chart of the present invention is as Image 6 shown, where each step corresponds to Figure 5 One or more modules in:
[0167] After the system boots, the whole algorithm starts:
[0168] ①Assign the initial value. In this step, all variables involved in the algorithm are initially assigned (all assigned to zero). The fault flag variable F is assigned a value of zero to indicate that the system is healthy, the fault location variable Loc is as...
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The invention relates to a fault diagnosis method of a three-phase permanent magnet synchronous motor control system. The method comprises the following steps: analyzing and summarizing fault characteristics of the system under various faults; then, using a differential current state observer for extracting differential current distortion (a residual error), obtaining residual error characteristics under various faults according to the fault characteristics, and then designing a fault detection and fault isolation algorithm; in order to improve the robustness of a fault detection algorithm, a novel self-adaptive fault detection threshold is designed, so that the algorithm can still realize rapid and accurate fault detection under complex working conditions of speed change, variable load and parameter perturbation, i.e., the algorithm is endowed with good robustness. The method has the advantages of strong anti-interference capability, strong robustness, high detection speed, high detection accuracy and the like, does not need to add an additional sensing circuit, and is a low-cost and high-performance online fault diagnosis method suitable for a three-phase permanent magnet synchronous motor control system.
Description
technical field [0001] The invention relates to a fault diagnosis method for a control system of a permanent magnet synchronous motor, which is mainly used for disconnection of the inverter switching tube, inter-turn short circuit of the motor winding, and disconnection of the motor winding that occur frequently during the operation of the motor control system These three faults are detected in real time and the source of the fault is located. Background technique [0002] Permanent magnet synchronous motors are widely used in industry, military, aerospace and other fields because of their advantages such as wide speed range, good dynamic response, strong controllability, and high power factor. The faults of the inertial actuator frame motor drive system are mainly divided into motor body and driver faults. The open circuit fault of the inverter switching tube is one of the most common faults in the permanent magnet synchronous motor control system. It will greatly reduce t...
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Login to View More IPC IPC(8): H02P21/00H02P21/13H02P21/14H02P29/024
Inventor 周新秀胡青瑶王博阳张旨
Owner BEIHANG UNIV