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

Method for calculating transient state short circuit currents of doubly-fed induction generator set

A generator set, double-fed asynchronous technology, applied in the direction of CAD circuit design, calculation, electrical digital data processing, etc., can solve the problem that the transient short-circuit current of the double-fed asynchronous generator set cannot be accurately calculated

Active Publication Date: 2014-01-08
STATE GRID CORP OF CHINA +1
View PDF2 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a calculation method for the transient short-circuit current of a doubly-fed asynchronous generator set, which is used to solve the technical problem that the transient short-circuit current of a doubly-fed asynchronous generator set cannot be accurately calculated in the prior art

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
  • Method for calculating transient state short circuit currents of doubly-fed induction generator set
  • Method for calculating transient state short circuit currents of doubly-fed induction generator set
  • Method for calculating transient state short circuit currents of doubly-fed induction generator set

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but not to limit the present invention.

[0055] The embodiment of the present invention provides a method for calculating the transient short-circuit current of a doubly-fed asynchronous generator set, such as figure 1 As shown, the method includes:

[0056] Step 101, establishing a transient mathematical model of the doubly-fed asynchronous generator set under the grid voltage deep sag fault, and establishing a transient equivalent circuit of the doubly-fed asynchronous generator set according to the transient electrical relationship in the mathematical model;

[0057] Step 102, analyze the flux linkage relationship of t...

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 method for calculating transient state short circuit currents of a doubly-fed induction generator set. The method comprises the steps that a transient state mathematical module of the doubly-fed induction generator set is established under a network voltage depth drop fault, and a transient state equivalent circuit of the doubly-fed induction generator set is established according to the transient state electrical relation in the mathematical module; the flux linkage relation of the transient state equivalent circuit of the doubly-fed induction generator set is analyzed, and first stator transient state currents generated when generator terminal voltages of the doubly-fed induction generator set drop are obtained; the transient state equivalent circuit of the doubly-fed induction generator set is corrected according to a crowbar circuit input mechanism, and second stator transient state currents generated when the generator terminal voltages of the double-fed induction generator set drop under the condition that crowbar circuits are input are obtained after correcting. The transient state short circuit currents of the doubly-fed induction generator set are obtained according to the second stator transient state currents.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a method for calculating transient short-circuit current of a doubly-fed asynchronous generator set. Background technique [0002] Among all kinds of wind turbines, Double Fed Induction Generator (DFIG) is one of the mainstream models of megawatt wind turbines. Since the generator stator of the doubly-fed wind turbine is directly connected to the power grid, when a short-circuit fault occurs in the system, the voltage change on the grid side will cause a large current on the rotor side through the induction between the stator and the rotor, that is, a large current is generated on the rotor side. The short-circuit current will have an impact on the inverter and fan of the wind turbine. In addition, the protection settings related to wind turbines need to consider the influence of the short-circuit current of the wind turbines. Therefore, the quantitative calculation of the s...

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): G06F19/00G06F17/50
CPCY02E60/76Y04S40/22G06F30/30G06F30/20H02P9/007
Inventor 王耀函刘辉吴林林刘京波王皓靖
Owner STATE GRID CORP OF CHINA
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