Open-circuit fault diagnosis method for dual-active-bridge DC-DC converter

A technology of DC-DC and dual active bridges, applied in the direction of fault location, etc., can solve the problems of unable to locate the fault switch, unable to popularize and apply dual active bridge DC-DC converters, and more detection information

Active Publication Date: 2021-04-27
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dual active bridge DC-DC converter control system generally only collects the input and output voltages, and cannot complete the fault switch location without adding hardware equipment.
At present, most of the diagnostic algorithms used for full-bridge DC-DC converters will de

Method used

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  • Open-circuit fault diagnosis method for dual-active-bridge DC-DC converter
  • Open-circuit fault diagnosis method for dual-active-bridge DC-DC converter
  • Open-circuit fault diagnosis method for dual-active-bridge DC-DC converter

Examples

Experimental program
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Effect test

Embodiment

[0056] Embodiment: the Matlab / Simulink version used is 2014b, the control period is 20us, and the control mode is unified phase shift (unified phase shift, UPS) control.

[0057] Step 1: Build a normal working model of a dual active bridge DC-DC converter on Matlab / Simulink, set the PWM switching frequency to 1000Hz, input DC voltage to 3000V, output reference voltage to 3000V, auxiliary inductance to 1.8mH, and load resistance to 20Ω; Build the system UPS control algorithm in Simulink to realize the normal operation of the dual active bridge DC-DC converter, and embed the fault diagnosis algorithm in it for online fault monitoring;

[0058] Step 2: By setting the loss of the driving signal sent by the control system, the effect of simulating the open circuit failure of the switch tube is simulated;

[0059] Step 3: Every other control cycle, sample the primary side input voltage U in , Secondary side output voltage U o , primary side inductor current i L , Voltage between ...

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PUM

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Abstract

The invention discloses an open-circuit fault diagnosis method for a dual-active-bridge DCDC converter. The method specifically comprises the following steps of: calculating the switching function of two H bridges of the dual-active-bridge DC-DC converter according to a system driving pulse signal and the polarity of primary side inductive current; calculating an inductive current state estimation model of the dual-active-bridge DC-DC converter according to the circuit topology and the working principle of the dual-active-bridge DC-DC converter; and designing a fault diagnosis algorithm according to inter-bridge-arm voltage characteristics and current residual characteristics under the fault. According to the method of the invention, monitoring of the working state of the dual-active-bridge DC-DC converter and rapid and accurate diagnosis under different switching tube faults are realized, and a new diagnosis idea is provided for the fault diagnosis technology of the dual-active-bridge DC-DC converter.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of power electronic systems, and in particular relates to an open circuit fault diagnosis method of a dual active bridge DC-DC converter. Background technique [0002] As a general power conversion topology, the dual active bridge DC-DC converter has been applied to various important power conversion systems due to its advantages of high power density, strong control flexibility, and modular design, such as electric vehicles, storage energy systems and power electronic transformers. With the increasing reliability requirements of power electronic converters, the problem of fault diagnosis in dual active bridge DC-DC converters has attracted more and more attention. [0003] Power modules are the most fragile semiconductor devices, and their faults can be roughly divided into open circuit faults and short circuit faults. Short circuit faults mainly include switch short circuit, antiparall...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/08
Inventor 葛兴来谢东冯晓云苟斌宋文胜王青元
Owner SOUTHWEST JIAOTONG UNIV
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