Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Failure predication method for static security analysis of three-winding transformer

A technology for static safety analysis and transformer faults. It is used in instruments, measuring electrical variables, measuring devices, etc., and can solve the problems of inability to meet the second-level real-time calculation speed requirements of large power grids and high cost.

Active Publication Date: 2014-09-10
CHINA ELECTRIC POWER RES INST +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the failure of three-winding transformers involves the disconnection of multiple branches, and at the same time, the medium and low voltage sides are often connected separately with injection components or equivalent loads, resulting in partial power loss after the fault, making the conventional sensitivity algorithm unsuitable for the local power loss of the power system after the fault. , and re-forming the matrix and factor table for calculation requires a lot of computer time, which cannot meet the speed requirements of second-level real-time calculation of large power grids

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
  • Failure predication method for static security analysis of three-winding transformer
  • Failure predication method for static security analysis of three-winding transformer
  • Failure predication method for static security analysis of three-winding transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0069] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0070] like figure 1 , a method for judging a fault of a three-winding transformer for static safety analysis, said method comprising the following steps:

[0071] Step 1: Calculate the ground state power flow to obtain the Jacobian matrix J 0 , the corresponding sensitivity matrix S 0 and the grid initial state variable X consisting of node voltages and phase angles 0 ;

[0072] Step 2: Determine the wiring mode of the faulty three-winding transformer;

[0073] Step 3: Calculate grid state variables and power flow power according to the connection mode;

[0074] Step 4: Determine whether there is an over-limit phenomenon in the power system, and if so, define the fault as a harmful fault.

[0075] In the above step 2, the wiring method includes the connection method that disconnection will not cause disconnection or power loss, the low-voltage side is ...

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 provides a failure predication method for static security analysis of three-winding transformers, belonging to the technical field of electric system analysis. In the invention, transformers are sorted aiming at connection modes mainly adopted by the three-winding transformers in an electric grid, and the computing mode of the on-off sensitivity of different wire connection modes is deduced. The invention is suitable for the computation of the sensitivity of load flows of most faulty three-winding transformers in the electric grid, solves the problem that the conventional sensitivity algorithm can not be applied due to local electric power shutdown caused by the failure of the three-winding transformers and can meet the requirement of the on-line real-time second grade analysis and computation of the large-scale electric grid in both accuracy and speed by acquiring comprehensive accurate operating data of power flows and reactive power flows of a system, voltage amplitudes value and voltage phases of a bus, and the like.

Description

technical field [0001] The invention belongs to the technical field of power system analysis, and in particular relates to a three-winding transformer fault judgment method for static safety analysis. Background technique [0002] Static security analysis is an important part of power system security analysis. At present, static security analysis N-1 generally uses methods such as sensitivity method, DC power flow method and compensation method. Among them, DC power flow method cannot calculate reactive power and voltage, while modern The power system needs to check whether the branch flow power and cross-section power flow exceed the limit, and also needs to check whether the bus voltage exceeds the limit; if the compensation method does not have enough iterations, the error of the voltage and reactive power flow will be large; the sensitivity method will support The circuit breaking is regarded as a disturbance of normal operation, and the influence of branch circuit break...

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): G01R31/00
Inventor 蔡帜戴赛周京阳潘毅李强
Owner CHINA ELECTRIC POWER RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com