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Open-circuit fault diagnosis method for switch tubes of single-phase cascaded H-bridge rectifier

A rectifier switching tube and open-circuit fault technology, which is applied in the direction of instruments, measuring devices, and measuring electronics, can solve the problem of few diagnostic methods for single-phase cascaded H-bridge rectifiers, and achieve good real-time performance, good versatility, and online Detection effect

Active Publication Date: 2019-08-16
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0003] In the current diagnostic technology, there are few diagnostic methods that can be applied to single-phase cascaded H-bridge rectifiers

Method used

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  • Open-circuit fault diagnosis method for switch tubes of single-phase cascaded H-bridge rectifier
  • Open-circuit fault diagnosis method for switch tubes of single-phase cascaded H-bridge rectifier
  • Open-circuit fault diagnosis method for switch tubes of single-phase cascaded H-bridge rectifier

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Embodiment Construction

[0087] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. The single-phase cascaded H-bridge rectifier switching tube open-circuit fault diagnosis method provided by the invention considers the output side current, the DC side capacitance and the load current, and considers the freewheeling effect of the diode antiparallel with the switching tube. At the same time, the switching device is idealized, and factors such as switching loss, turn-on and turn-off transient, turn-on and turn-off time, conduction tube voltage drop, and leakage current are ignored.

[0088] The basic circuit topology of single-phase cascaded H-bridge rectifier before the power electronic traction transformer is as follows: figure 1 As shown, the basic working principle of the single-phase cascaded H-bridge rectifier is as follows figure 2 shown. The input quantity of the online fault diagnosis algorithm of electric tr...

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Abstract

The invention discloses an open-circuit fault diagnosis method for switch tubes of a single-phase cascaded H-bridge rectifier. According to a system switch control signal and alternating-current sidecurrent polarity, switch functions under normal operation and different switch tube faults are calculated; and an output current calculation model and a state estimation model of a single-phase cascaded H-bridge rectifier module are obtained according to circuit topology of the cascaded H-bridge rectifier, and a calculated value and an estimated value of an output current are obtained. Based on characteristics that fault features of current residuals of different modules are separated and different fault diagnosis variables are mutually independent, any faulted switch tube can be positioned bycomparing the diagnosis variables with a self-adaptive detection threshold value. According to the method, the real-time diagnosis of the single-phase cascaded H-bridge rectifier in one or more switch tube fault states in an on-line real-time system can be realized, and the influence of network voltage fluctuation, load variation and operation condition change of the single-phase cascaded H-bridge rectifier is avoided; and moreover, the diagnosis time is short, the faults can be isolated in time, and the occurrence of secondary faults of the system is avoided.

Description

technical field [0001] The invention relates to the technical field of electric traction AC transmission, in particular to a single-phase cascaded H-bridge rectifier switching tube open-circuit fault diagnosis method. Background technique [0002] The AC-DC-AC transmission system is widely used in rail transit electric traction system due to its friendly grid-side characteristics and good traction performance. Compared with the power frequency transformer in the traditional traction system, the Power Electronic Traction Transformer (PETT) has the advantages of light weight, small size, high efficiency and environmental friendliness, and it will become the best choice for future high-speed EMU lightweight. An industry survey of converter reliability shows that power semiconductors are the most vulnerable part of the converter. Moreover, the operating environment of the electric traction drive system is complex, and long-standing factors such as corrosion, humidity, and tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 葛兴来谢东
Owner SOUTHWEST JIAOTONG UNIV
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