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

DFIG subsynchronous oscillation suppression method based on multi-branch impedance remodeling

A sub-synchronous oscillation and multi-branch technology, applied in the direction of reducing/preventing power oscillation, single-network parallel feeding arrangement, etc., can solve the problems of inability to suppress sub-synchronous oscillation, serious sub-synchronous oscillation, and limited suppression effect, etc. Guaranteed stability and economy, improved inhibition effect, and strong inhibition effect

Active Publication Date: 2020-06-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first two types of suppression strategies need to add hardware devices to the system, which is not economical in cost
However, the existing subsynchronous damping controller strategy on the control loop of wind turbine converter only adds virtual resistance to the rotor side converter (RSC), and the suppression effect is limited.
Especially for wind power systems with high series compensation degree, the degree of subsynchronous oscillation is relatively serious, and only adding virtual damping in RSC cannot suppress subsynchronous oscillation

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
  • DFIG subsynchronous oscillation suppression method based on multi-branch impedance remodeling
  • DFIG subsynchronous oscillation suppression method based on multi-branch impedance remodeling
  • DFIG subsynchronous oscillation suppression method based on multi-branch impedance remodeling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The following examples are only used to illustrate the technical solutions of the present invention more clearly, and therefore are only examples, rather than limiting the protection scope of the present invention.

[0017] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application shall have the usual meanings understood by those skilled in the art to which the present invention belongs.

[0018] The structure of double-fed wind power generation system is as follows: figure 1 As shown, including double-fed fan, GSC, RSC, grid-side filter, transformer, transmission line, series compensation capacitor, etc. Based on the original RSC impedance model (such as figure 2 shown), GSC impedance model (such as image 3 Shown) and the equivalent circuit of the impedance model of the doubly-fed wind power generation system established by the DFIG impedance model is as follows Figure 4 As shown, the impedance model 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 discloses a DFIG subsynchronous oscillation suppression method based on multi-branch impedance remodeling. The method comprises a filter for filtering fundamental frequency components ofrotor current and GSC current, a voltage instruction virtual impedance generation device for generating virtual impedance, and a suppression device for superposing the voltage instruction corresponding to the virtual impedance with an original voltage given value to obtain a new voltage given value. Virtual impedance control is added to a rotor-side converter (RSC) and a grid-side converter (GSC)of the doubly-fed wind generator to change equivalent impedance of a doubly-fed wind power generation system. Therefore, rapid and effective suppression of subsynchronous oscillation is realized, stability and cost-effectiveness of the subsynchronous oscillation suppression method are guaranteed without adding other equipment, the suppression effect is stronger than that of traditional additionaldamping control, the suppression effect is achieved in the whole subsynchronous frequency band, and the suppression effect is improved.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a DFIG subsynchronous oscillation suppression method based on multi-branch impedance remodeling. Background technique [0002] With the increase of wind power capacity, there have been many subsynchronous oscillations of large-scale wind farm grid-connected systems at home and abroad, resulting in a large area of ​​wind turbines being disconnected from the grid, which has seriously affected the security of the grid. In order to avoid this effect, fast and effective measures are needed to suppress the subsynchronous oscillation. [0003] Existing subsynchronous oscillation suppression strategies for doubly-fed wind generators (DFIG) are mainly divided into three categories: flexible transmission system and its additional additional damping controller, subsynchronous filter, and additional subsynchronous damping on the wind turbine converter control loop. controller....

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): H02J3/38H02J3/24
CPCH02J3/24
Inventor 刘其辉唐光钰史淳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com