Fault diagnosis for three-phase PWM rectifier based on deep feedforward network with transient synthetic features

TL;DR

This paper presents a fault diagnosis method for three-phase PWM rectifiers using a deep feedforward network trained on transient synthetic features, achieving high accuracy and improved reliability in fault detection.

Contribution

The study introduces a fault diagnosis approach that reduces dependence on mathematical fault models by using transient synthetic features for training deep neural networks.

Findings

Fault diagnosis accuracy reaches 97.85% with synthetic features.

Transient synthetic features outperform original transient features by over 1%.

The method accurately locates IGBT faults and enhances diagnosis reliability.

Abstract

Three-phase PWM rectifiers are adopted extensively in industry because of their excellent properties and potential advantages. However, while the IGBT has an open-circuit fault, the system does not crash suddenly, the performance will be reduced for instance voltages fluctuation and current harmonics. A fault diagnosis method based on deep feedforward network with transient synthetic features is proposed to reduce the dependence on the fault mathematical models in this paper, which mainly uses the transient phase current to train the deep feedforward network classifier. Firstly, the features of fault phase current are analyzed in this paper. Secondly, the historical fault data after feature synthesis is employed to train the deep feedforward network classifier, and the average fault diagnosis accuracy can reach 97.85% for transient synthetic fault data, the classifier trained by the transient synthetic features obtained more than 1% gain in performance compared with original transient features. Finally, the online fault diagnosis experiments show that the method can accurately locate the fault IGBTs, and the final diagnosis result is determined by multiple groups results, which has the ability to increase the accuracy and reliability of the diagnosis results. (c) 2020 ISA. Published by Elsevier Ltd. All rights reserved.