A control method and device for avoiding large-scale wind farm resonance

A technology of large-scale wind farms and control methods, which can be applied to circuit devices, harmonic reduction devices, wind power generation, etc., and can solve problems such as potential safety hazards

Active Publication Date: 2016-05-25
ZHEJIANG WINDEY +3
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of unavoidable high-order harmonic resonance and potential safety hazards in existing wind farms, the present invention provides a control method for avoiding large-scale wind farm resonance that effectively avoids high-order harmonic resonance and eliminates potential safety hazards and its device

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
  • A control method and device for avoiding large-scale wind farm resonance
  • A control method and device for avoiding large-scale wind farm resonance
  • A control method and device for avoiding large-scale wind farm resonance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0062] The present invention will be further described below in conjunction with the accompanying drawings.

[0063] refer to Figure 1 to Figure 6 , a control method for avoiding resonance in a large wind farm, the control method comprising the following steps:

[0064] 1) Data measurement collection and processing analysis

[0065] Take the wind farm outlet as the measurement point, collect voltage and current data, perform high-pass filter HPF and discrete Fourier decomposition DFT signal processing in sequence, and use Thevenin's equivalent theorem to find the harmonic impedance of the wind farm system;

[0066] Analyze the calculated harmonic impedance results, draw the relationship diagram between the impedance amplitude Z and the harmonic order h, and the impedance angle The relationship diagram with the harmonic order h; the resonance point is determined by the large impedance amplitude and zero impedance angle, and the resonance frequency is calculated; the harmoni...

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

Disclosed is a control method for avoiding large-wind-field resonance. The control method includes the steps of 1), performing data measurement acquisition and processing analysis by taking an exit of a wind power field as a measurement point, acquiring voltage and current data, sequentially performing high-pass filtering (HPF) and discrete Fourier decomposition (DFT) signal processing, calculating harmonic impedance of a wind power field system by the aid of a thevenin equivalent theorem, and performing analysis on calculated harmonic impedance results to acquire resonant frequency; 2), performing logic calculation on cutting capacity of a parallel capacitor, and judging whether the resistance value of an electric-field connecting point is located within the range of + / -30% of two intermediate impedance values or not by the aid of sequences of switching in and switching on under certain capacitor capacity till requirements are met; 3), the transistors controlling capacitor banks to be merged into a power grid for operation. The invention further provides a control device for avoiding large-wind-field resonance. By the control method and device, higher harmonic resonance can be effectively avoided, and potential safety hazards can be effectively removed.

Description

technical field [0001] The invention relates to the technical field of wind farms, in particular to a control method and a control device for avoiding resonance of wind farms. Background technique [0002] The rapid development of power electronic technology has affected the wide application of various power electronic devices in power systems, industries, transportation and households, resulting in increasingly prominent harmonic problems and increasingly serious harm caused by harmonics. [0003] For a long time, my country's wind power industry has followed the route of "large-scale, highly concentrated development, and long-distance, high-voltage transmission" to develop large-scale wind farms and integrate them into large power grids. Wind power grid connection will cause power quality problems. Because the harmonics have a serious impact and harm on the power grid, the harmonic problem of wind turbines connected to the power grid has become one of the power quality pro...

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): H02J3/01H02J3/38
CPCH02J3/001H02J3/01H02J3/1864Y02E10/76Y02E40/40
Inventor 杨靖许国东应有朱凌志陈宁钱敏惠姜达军施涛韩华玲
Owner ZHEJIANG WINDEY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap