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

Analysis method of three-phase short circuit current of doubly-fed induction generator after crowbar protection action

A technology of crowbar protection and double-fed induction, which is applied in the field of analysis of three-phase short-circuit current of double-fed induction wind turbines, and can solve problems such as complex transient characteristics

Active Publication Date: 2018-09-21
KUNMING UNIV OF SCI & TECH
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But on the other hand, the transient characteristics of grid-connected doubly-fed induction wind turbines are quite complicated when the grid-connected voltage dips, which is different from traditional synchronous and asynchronous motors.

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
  • Analysis method of three-phase short circuit current of doubly-fed induction generator after crowbar protection action
  • Analysis method of three-phase short circuit current of doubly-fed induction generator after crowbar protection action
  • Analysis method of three-phase short circuit current of doubly-fed induction generator after crowbar protection action

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Embodiment 1: the analysis method of the three-phase short-circuit current of the doubly-fed induction wind-driven generator after a kind of crowbar protection action, the steps are as follows:

[0066] Step 1: According to the equivalent circuit diagram of the doubly-fed induction wind turbine after the crowbar protection action ( figure 2 ) to write the stator and rotor voltage equations in the dq rotating coordinates, write the stator and rotor flux equations in the dq rotating coordinates according to the self-inductance flux linkage and mutual inductance flux linkage of the double-fed induction wind turbine stator and rotor, and then establish the stator and Rotor flux equation, derived stator and rotor current equations;

[0067] Step 2: According to the stator voltage equation written in step 1 and the flux conservation principle, obtain the analytical formula of the stator flux linkage after the fault;

[0068] Step 3: Perform Laplace transformation on the rot...

Embodiment 2

[0111] Embodiment 2: This embodiment takes a grid-connected doubly-fed induction wind turbine as an example, assuming that at t 0 When a three-phase short-circuit fault occurs in the system at any time, the specific parameters of the doubly-fed induction wind turbine after the crowbar protection action are shown in Table 1:

[0112] Table 1 Parameter setting of doubly-fed induction generator

[0113] parameters

Terminal voltage amplitude U m

Coefficient of voltage drop degree k

Rotor side equivalent resistance R r

Stator equivalent resistance R s

Voltage initial phase angle α

Value (pu)

1

0.9

0.016

0.023

108°

parameters

Stator leakage inductance L σs

Rotor leakage inductance L σr

Exciting inductance L m

Synchronous speed ω 1

Rotor speed ω r

Value (pu)

0.18

0.16

2.9

1

1.2

parameters

crowbar circuit resistance R c

frequency f

...

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 relates to an analysis method of a three-phase short circuit current of a doubly-fed induction generator after crowbar protection action and belongs to the technical field of fault analysis of a wind power generation system. The method, by utilizing DFIG stator and rotor voltage equations and stator and rotor flux linkage equations after crowbar protection action, deduces the three-phase short circuit current of the doubly-fed induction generator after crowbar protection action, and thus the calculating process is simplified. The method can accurately calculate the three-phase short circuit current of the doubly-fed induction generator after crowbar protection action, and is of great significance to model selection and protection action characteristic analysis of electric power system equipment comprising the doubly-fed induction generator.

Description

technical field [0001] The invention relates to a method for analyzing the three-phase short-circuit current of a doubly-fed induction wind power generator (DFIG) after a crowbar (Crowbar) protection action, and belongs to the technical field of fault analysis of wind power generation systems. Background technique [0002] With the development of the global economy and the substantial increase in energy consumption, the contradiction between energy storage, production and use has become increasingly prominent, and it has become one of the important problems to be solved urgently by countries all over the world. Therefore, in order to solve problems such as energy crisis and environmental pollution, the research and development of new energy sources such as wind energy and solar energy have become a very urgent demand for human beings. Among them, wind energy is a clean and sustainable energy. Compared with traditional energy sources, wind power has the characteristics of not...

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): H02P21/14H02P101/15
CPCH02P21/14H02P2101/15
Inventor 范小红孙士云安德超孙德娟王杨海世芳张雪娟郑新宇
Owner KUNMING UNIV OF SCI & TECH
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