Power electronic system fault diagnosis method based on bond graph

Abstract

The invention discloses a power electronic system fault diagnosis method based on a bond graph. The power electronic system fault diagnosis method comprises the following steps of (1) combining a modulation transformer MTF of a standard bond graph element and a resistive element R to construct a switch bond graph element with a fixed causal relationship; (2) constructing a behavior bond graph model of a power electronic system to simulate running states of the system during normal working and under failure; (3) constructing a global analytical redundancy relation with an independent structure in the model, obtaining a circuit fault feature matrix and system running residue set, and comparing the set with a fault feature matrix to determine the health state of the system and position a faulted element. A bond graph modeling and fault diagnosis method provided by the invention can be used for performing uniform modeling and fault diagnosis on a multi-energy-domain system such as electromechanics, so that the problem that mistakes are easily made in the conventional method for respectively modeling different energy domains and combining energy domain models is solved; a solution based on a bond graph method is supplied to multi-energy-domain system modeling and fault diagnosis based on a model method.

Description

technical field [0001] The invention relates to an online fault diagnosis method of a power electronic system based on a bonding graph, belonging to the field of circuit fault diagnosis. Background technique [0002] The power electronic system including control, drive circuit and motor usually appears as an actuator in the equipment, which has a decisive influence on the reliability of the entire system. On-line fault diagnosis and location technology of power electronic system can troubleshoot and resolve faults without affecting equipment operation and within the shortest downtime. Therefore, it is very important to study the fault diagnosis of the power electronic system to improve the reliability of the equipment. [0003] The bond graph method is an important tool for dynamic analysis, modeling and simulation of multi-energy domain complex systems. It is based on the law of energy conservation, and some basic components are connected in a certain way, and the system p...

AI Technical Summary

Problems solved by technology

It can be seen that the traditional analytic redundancy relationship is greatly constrained in the fault diagnosis of switching circuits

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