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

Open-circuit fault detection positioning method, system and device and storage medium

A technology of open-circuit fault and positioning method, which is applied in the direction of fault location, measuring device, output power conversion device, etc., can solve the problems of complex fault detection and high cost, and achieve the effect of reducing complexity and reducing use cost

Pending Publication Date: 2022-03-25
GREE ELECTRIC APPLIANCES INC
View PDF9 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem in the prior art that the fault detection when an open circuit fault occurs in a switching device is too complicated and the cost is high, the present invention provides a method, system, device and storage medium for detecting and locating an open circuit fault. The characteristic of power transmission capacity decline, the detection and location of open circuit faults, and the low-cost detection without additional sensors and additional detection circuits can accurately locate the full bridge where the faulty device is located

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
  • Open-circuit fault detection positioning method, system and device and storage medium
  • Open-circuit fault detection positioning method, system and device and storage medium
  • Open-circuit fault detection positioning method, system and device and storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0055] A method for detecting and locating open-circuit faults of dual active full-bridge converters, including the topology of DAB converters, such as figure 1 As shown, the topology includes a primary full bridge and a secondary full bridge, and the primary full bridge has a switching device Q 1 , switching device Q 2 , switching device Q 3 , switching device Q 4 , the secondary full bridge has a switching device switching device Q 5 , switching device Q 6 , switching device Q 7 , switching device Q 8 , as shown in the figure also includes: input side voltage v in , The support capacitor C on the input side in , load side voltage v o , the support capacitor C on the output side o , the sum of the auxiliary inductance and the leakage inductance of the high-frequency transformer T L r .

[0056] Such as figure 2 As shown, the detection and positioning method includes the following steps:

[0057] S100, start the DAB converter and adopt a single phase shift contro...

Embodiment example 2

[0082] A detection and positioning system for an open-circuit fault of a dual active full-bridge converter, comprising:

[0083] An acquisition module, configured to acquire a parameter value of a DAB converter adopting single phase shift control, the parameter value including at least one of the following: the dead time T of the converter drive pulse dead , half switching period T hs , load power value P L , Outward shifting ratio D, the control frequency f of the converter, the transformation ratio n of the converter, the input side voltage v of the converter in , the load side voltage v of the converter o , the sum of the leakage inductance of the converter and the auxiliary inductance L r ;

[0084] The first mathematical model is used to calculate the transmission power value P of the normal working condition group according to the parameter value T , the first mathematical model is:

[0085] The second mathematical model is used to calculate the transmission powe...

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 method for detecting and positioning an open-circuit fault of a dual-active full-bridge converter, and the method comprises the steps: obtaining a parameter value of the converter; calculating three groups of transmission power values of m control periods by a mathematical model according to the parameter values, and respectively calculating each group of transmission power values by a variance model to obtain transmission power variance values XLT, XLP and XLS; judging the magnitude of each transmission power variance value; when the transmission power variance value XLT is minimum, indicating that the converter has no fault; when the transmission power variance value XLP is minimum, it is indicated that the primary side full bridge has an open-circuit fault; and when the transmission power variance value XLS is minimum, indicating that the secondary side full bridge has an open-circuit fault. According to the method, additional sensors are not needed to obtain system parameters, the use cost is greatly reduced, the complexity of the system is also reduced, the open-circuit fault is detected and positioned by utilizing the characteristic that the power transmission capability is reduced when the DAB converter has the open-circuit fault, and a basis is provided for implementation of a fault tolerance control strategy.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis of power electronic systems, in particular to an open circuit fault detection and positioning method, system, device and storage medium. Background technique [0002] Due to its high power density, soft switching, and electrical isolation, dual active full-bridge DC / DC (DAB) converters are widely used in renewable energy generation grid-connected systems, battery energy storage systems, railway traction transformers, and other fields. As the core components of the above-mentioned fields, the reliability of DAB is particularly important. However, the number of switching devices in DAB is large, and the normal operation of the system depends on the normal operation of its switching device circuit and other parts of the circuit. Therefore, the fault-tolerant control strategy for DAB will be an important research direction. [0003] The fault-tolerant control strategy is divided into three pa...

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
IPC IPC(8): H02M3/335H02M1/38G01R31/08G01R31/54G01R31/56
CPCH02M3/33576H02M3/33584H02M1/38G01R31/54G01R31/56G01R31/088
Inventor 聂川杰孙磊夏乐梅郑文帅赵向阳
Owner GREE ELECTRIC APPLIANCES INC