A comprehensive diagnosis method for power tube open circuit fault and current sensor fault of three-phase three-wire inverter with two current sensors

A current sensor, three-phase three-wire technology is applied in the field of comprehensive diagnosis of three-phase three-wire inverter power tube open-circuit fault and current sensor fault, achieving the effect of small calculation amount, avoiding hardware circuit and software burden, and rapid diagnosis.

Active Publication Date: 2020-09-29
ZHEJIANG UNIV
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that in the three-phase three-wire inverter with two current sensors, there is no method to realize the comprehensive diagnosis of power tube open circuit fault and current sensor fault at the same time

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A comprehensive diagnosis method for power tube open circuit fault and current sensor fault of three-phase three-wire inverter with two current sensors
  • A comprehensive diagnosis method for power tube open circuit fault and current sensor fault of three-phase three-wire inverter with two current sensors
  • A comprehensive diagnosis method for power tube open circuit fault and current sensor fault of three-phase three-wire inverter with two current sensors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] Such as figure 1 As shown, the three-phase three-wire inverter topology with two current sensors of the present invention and the comprehensive diagnosis method for power tube open circuit fault and current sensor fault include the following steps:

[0047] S1. Obtain electrical information for diagnostics from a three-phase three-wire inverter system with two current sensors

[0048] In a three-phase three-wire inverter with two current sensors, the output phase current (i A i B ), output phase voltage (v AO , v BO , v CO ), DC bus voltage (v dc ) is collected and sent to the control system to realize functions such as closed-loop operation and protection; the controller calculates and obtains the pulse driving signal of each phase bridge arm ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a comprehensive diagnosis method for an open circuit fault of a power tube of a three-phase three-wire inverter with two current sensors and a current sensor fault. According to the method, the output line voltage deviation and the output phase voltage deviation are used as diagnostic variables at the same time, and the faults are detected and located through two characteristic combinations of the diagnostic variables. The method realizes comprehensive diagnosis of the open circuit fault of the power tube of the three-phase three-wire inverter with the two current sensors and the current sensor fault for the first time, only existing information in a control system needs to be controlled, the calculation amount is small, the two faults can be quickly and accuratelydiagnosed without adding additional sampling and hardware circuits, and the method has the advantage of high practicability.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of power electronic equipment, and in particular relates to a method for comprehensively diagnosing the open circuit fault of a power tube of a three-phase three-wire inverter with two current sensors and the fault of the current sensor. Background technique [0002] Inverters have been widely researched and applied in the fields of new energy grid connection and uninterruptible power supply. Inverters play a key role in controlling and transmitting electric energy, but inverters are also the equipment with the highest failure rate. The unexpected occurrence of inverter failure can lead to huge losses. Fast and accurate fault diagnosis of the inverter is helpful to improve the availability of the inverter, protect the system in time and reduce the maintenance time, so it is of great significance. In inverters, power tube open circuit faults and current sensor faults are common faults. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00G01R31/26G01R31/54
CPCG01R31/2601G01R35/00
Inventor 马皓李战
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap