System design method for minor fault detection and position of electrical traction system

A technology of fault detection and electric traction, which is applied in general control systems, electrical testing/monitoring, control/regulation systems, etc., and can solve problems such as false positives and false negatives in fault diagnosis

Active Publication Date: 2018-09-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The accuracy of traditional fault diagnosis methods based on observers and odd-even space methods depends on the accuracy of the established nonlinear system model. Generally, when th

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  • System design method for minor fault detection and position of electrical traction system
  • System design method for minor fault detection and position of electrical traction system
  • System design method for minor fault detection and position of electrical traction system

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Embodiment Construction

[0072] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0073] The invention provides a system design method for detecting and locating minor faults of an electric traction system, which includes the following steps:

[0074] Phase 1: Building Offline Data Models

[0075] 1) Collect the steady-state operation data of the sensor of the electric traction system and preprocess the offline data;

[0076] 2) Calculate the principal component and residual component values ​​and load vectors of different subspaces of the preprocessed data;

[0077] 3) Determine and calculate the performance index and its probability density function of the principal component analysis method, and determine the fault detection threshold of the performance index based on the calculation result;

[0078] Phase 2: Online Fault Diagnosis

[0079] 4) Process online data;

[0080] 5) Calculate the p...

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Abstract

The invention discloses a system design method for minor fault detection and position of an electrical traction system. The method comprises the following steps: 1) establishing an off-line data model: collecting sensor steady-state operation data of the electrical traction system and carrying out pretreatment on the off-line data; calculating values of a principal component and a residual component in different layers of subspaces of the data obtained after pretreatment and a load vector; determining and calculating a performance index and a probability density function of a principle component analysis method and a fault detection threshold; and 2) on-line fault diagnosis: processing online data; calculating a performance index of the principal component and the residual component in different layers of subspaces; and through the obtained fault detection threshold, constructing a probability matrix and carrying out fault diagnosis through Bayesian reasoning. The method can carry outeffective multi-feature description on tiny signals of an electrical drive device before occurrence of a fault, and can also carry out real-time online fault diagnosis under the condition that the model and parameters of the electrical drive system are unknown.

Description

technical field [0001] The invention belongs to the field of fault detection and fault location, in particular to a system design method for small fault detection and location of an electric traction system. Background technique [0002] Today, AC electric drive systems are widely used in the field of transportation, such as high-speed trains, subways, electric vehicles, etc. In order to improve the safety and reliability of the system, fault detection and diagnosis (FDD) of AC electric drive system has been one of the main issues of research and practical activities in the past two decades. [0003] In general, there are three main types of faults in AC electric drive systems: mechanical faults, electrical faults, and sensor faults. Electric traction systems are generally equipped with different types of sensors, such as: voltage sensors, current sensors, speed sensors, etc. Current sensors and speed sensors are mainly used for closed-loop control, and voltage sensors are...

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Application Information

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IPC IPC(8): G05B23/02
CPCG05B23/0243G05B2219/24065Y04S10/52
Inventor 陈宏田姜斌吴建萍
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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