Open-circuit fault diagnosis of single-phase three-level rectifier in high-speed train traction system based on adaptive sliding mode observer
XU Shui-qing
WANG Jian
HU You-qiang
ZHANG Ke
JIANG Ping
CHAI Yi
Abstract：In order to improve the stability and reliability of high-speed train traction system,an open-circuit fault diagnosis method for single-phase three-level rectifier based on the adaptive sliding mode observer is proposed in this paper.Firstly,the state space model of single-phase three-level rectifier under open-circuit fault condition is established,then an adaptive sliding mode observer with fast convergence speed and significant suppression of high-frequency chattering is designed to accurately estimate the grid-side current.Subsequently based on the gird-side current of the rectifier and the output current of the observer,an open-circuit fault detection method based on the root mean square of the absolute value of the current is proposed.On this basis,the current residual is used to construct the initial fault location to locate the power switches.Finally,an adaptive sliding mode observer based on the open-circuit fault switching function is used to locate the fault switch accurately.The method proposed in this paper can realize the fault detection and location of all power switches of single-phase three-level rectifier,with fast diagnosis speed,strong robustness and no additional hardware circuit.The accuracy and robustness of the proposed diagnosis method are verified by experiments.
Keywords：single-phase three-level rectifierhigh-speed train traction systemopen-circuit faultsliding mode observ-eradaptive threshold
Publication Date：2023-11-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 1920-1930 )