A Fault Diagnosis Method for Switch Tube Open Circuit of Single-phase Cascaded H-bridge Rectifier

A rectifier switch tube and open-circuit fault technology is applied in the field of open-circuit fault diagnosis of single-phase cascaded H-bridge rectifier switches, and can solve the problem that there are few diagnostic methods for single-phase cascaded H-bridge rectifiers.

Active Publication Date: 2020-08-07
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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  • A Fault Diagnosis Method for Switch Tube Open Circuit of Single-phase Cascaded H-bridge Rectifier
  • A Fault Diagnosis Method for Switch Tube Open Circuit of Single-phase Cascaded H-bridge Rectifier
  • A Fault Diagnosis Method for Switch Tube Open Circuit 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 a single-phase cascaded H-bridge rectifier switching tube open-circuit fault diagnosis method, which calculates the switching function under normal operation and different switching tube faults according to the system switch control signal and the AC side current polarity; according to the circuit of the cascaded H-bridge rectifier Topology, the output current calculation model and state estimation model of the single-phase cascaded H-bridge rectifier module are obtained, and the calculation value and estimated value of the output current are obtained. Based on the characteristics that the fault characteristics of different module current residuals are separated and different fault diagnosis variables are independent of each other, any fault switch can be located by comparing the diagnosis variables with the adaptive detection threshold. The invention can realize the real-time diagnosis of the single-phase cascaded H-bridge rectifier in the fault state of single or multiple switching tubes in the online real-time system, and is not free from network voltage fluctuations, load changes and operating conditions of the single-phase cascaded H-bridge rectifier The impact of changes; and the diagnosis time is short, which can isolate faults in time and avoid secondary faults of the system.

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 Patents(China)
IPC IPC(8): G01R31/52
CPCG01R31/50
Inventor 葛兴来谢东
Owner SOUTHWEST JIAOTONG UNIV
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