Fault diagnosis method for high-speed-train traction-motor nonlinear system sensor

Abstract

The invention discloses a fault diagnosis method for a high-speed-train traction-motor nonlinear system sensor. The method is characterized by firstly, establishing a traction motor state equation and an output equation, expanding a state vector and a fault vector into an augmented vector and acquiring an augmented system state space description equation; for the established augmented system state space description equation, designing an interval observer based on a unknown input observer and constructing an augmented system error dynamic equation; according to the augmented system state space description equation, acquiring a high speed train traction motor fault diagnosis observer gain matrix based on the unknown input observer and the interval observer; and carrying out equivalent linearity transformation on an augmented system so that a system error distribution matrix satisfies a Metzler matrix, and according to the designed observer, acquiring a state estimation value so as to complete on-line fault diagnosis and fault estimation. By using the method, fault diagnosis performance can be increased so that real-time fault diagnosis and fault estimation can be performed on the traction motor system sensor.

Description

technical field

[0001] The invention belongs to the technical field of fault diagnosis of a nonlinear system of a traction motor of a high-speed train, and relates to a fault diagnosis method for a sensor of a traction motor system of a high-speed train, in particular to a fault estimation method based on a combination of a robust unknown input observer and an interval observer . Background technique

[0002] With the advancement of science and technology and the needs of living standards, the continuous development of power electronics technology and electronic control technology has driven the rapid development of railway technology. EMUs, which are moving towards modern technology, are widely used in various railway lines in my country. High-speed trains provide great convenience for our travel. Considering the performance indicators of locomotives such as speed, comfort, and applicable economy, locomotives are safe and reliable. Safety cannot be ignored. It is an importan...

Images