Unlock instant, AI-driven research and patent intelligence for your innovation.

Real-time detection method for open circuit fault of three-phase inverter bridge arm in motor drive system

A technology of a motor drive system and a three-phase inverter is applied in the field of real-time detection of open-circuit faults of a three-phase inverter bridge arm of a motor drive system, which can solve problems such as complex current characteristics, reduce computational complexity and achieve good robustness. , high real-time effect

Active Publication Date: 2021-07-16
GUANGDONG INTELLIGENT ROBOTICS INST +2
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of the current closed-loop regulator, the current characteristics in the vector control drive system are much more complicated than those in the current open-loop control motor drive system

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
  • Real-time detection method for open circuit fault of three-phase inverter bridge arm in motor drive system
  • Real-time detection method for open circuit fault of three-phase inverter bridge arm in motor drive system
  • Real-time detection method for open circuit fault of three-phase inverter bridge arm in motor drive system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, and the implementation scope of the present invention is not limited thereto.

[0030] First refer to figure 1 , is the topological structure of the three-phase inverter of the motor drive system with fault diagnosis module in the present invention; the system consists of power tube S A1 ,S A2 ,S B1 ,S B2 ,S C1 ,S C2 , corresponding to the freewheeling diode D A1 ,D A2 ,D B1 ,D B2 ,D C1 ,D C2 , three-phase AC asynchronous motor IM, composed of filter capacitors C1 and C2, U d is the DC bus voltage, v is the output speed of the asynchronous motor, i a ,i b ,i c is the stator current of the asynchronous motor, and generates a drive signal to control the power tube to be turned on and off. In this fault diagnosis algorithm, i a ,i b ,i c , v is the variable that needs to be collected in real time.

[0031] A method for re...

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 real-time detection method for a bridge arm open circuit fault of a three-phase inverter in a motor drive system. Step 1, obtain the size L of the number of sampling points in a sliding window; step 2, calculate the three-phase current through the size L of the number of sampling points The covariance value (D ab ,D bc ,D ca ); Step 3, calculate D ab ,D bc ,D ca The absolute percentage of K ab , K bc , K ca To complete the fault diagnosis and location. The invention can detect the open circuit fault of any single bridge arm in any three-phase inverter system in real time, and can accurately locate the position of the fault bridge arm.

Description

technical field [0001] The invention belongs to the technical field of on-line detection, and in particular relates to a real-time detection method for an open-circuit fault of a bridge arm of a three-phase inverter of a motor drive system. Background technique [0002] At present, as a device for converting electrical energy and mechanical energy, AC motors have been widely used in the fields of aerospace, military, industry, locomotive traction systems and ships, showing a trend of completely replacing DC motors. As the core component of the AC motor drive system, the inverter is the weakest link in the drive system that is most likely to fail. Among them, the open-circuit fault of the power tube switch due to high-frequency turn-on and turn-off is particularly significant, which directly affects the performance of the motor drive system. normal operation. Aiming at the open-circuit fault of the inverter bridge arm, a real-time and effective detection, location and isolat...

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): G01R31/54G01R31/34
Inventor 赵金杨焕文王旭东刘洋耿涛施宇翔游继成曾山
Owner GUANGDONG INTELLIGENT ROBOTICS INST