Wind power subsynchronous oscillation detection and inhibition method based on empirical mode decomposition

An empirical mode decomposition and sub-synchronous oscillation technology, applied in wind power generation, reducing/preventing power oscillation, electrical components, etc., can solve the problem of inability to reflect the instantaneous frequency of oscillation and damping characteristics, inability to provide active support for a long time, and inability to locate disturbance periods and other issues to achieve the effect of improving simplicity and flexibility

Inactive Publication Date: 2016-04-20
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
View PDF3 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Invention patent CN104009495A proposes a wind power subsynchronous oscillation suppression method, but its detection and suppression method is only for flexible direct current transmission systems, and cannot provide active support for a long time
Among them, the fast Fourier transform lacks the ability to analyze the local characteristics of the 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
  • Wind power subsynchronous oscillation detection and inhibition method based on empirical mode decomposition
  • Wind power subsynchronous oscillation detection and inhibition method based on empirical mode decomposition
  • Wind power subsynchronous oscillation detection and inhibition method based on empirical mode decomposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] The present invention is described in detail below in conjunction with accompanying drawing:

[0043] In this example, the rated power of the wind farm is 40MW, and the AC bus voltage of the wind power is 110kV / 50Hz. The subsynchronous oscillation judgment, extraction and suppression of phase A current is taken as an example to illustrate.

[0044] refer to figure 2 , first, through the transformer set on the wind power grid-connected AC bus, the current of phase a is sampled, and the current obtained by sampling within a period of time t is stored as X(t).

[0045] refer to figure 1 , decompose and extract the sampled wind power signal through the following steps

[0046] Step (1): Sampling and storing the three-phase current of wind power grid-connected in real time.

[0047] Step (2): Treat the current sampled by each item as a time series, set the time series as X(t), and obtain all local extreme points;

[0048] Step (3): Find all the maximum points of the cur...

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 wind power subsynchronous oscillation detection and inhibition method based on empirical mode decomposition, comprising: employing an empirical mode decomposition algorithm to respectively rapidly decompose collected three phase current signals, respectively comparing the amplitude of each decomposed low frequency signal with a set value, and determining occurrence of subsynchronous oscillation according to comparison results. The subsynchronous oscillation decomposition and extraction method based on empirical mode decomposition can perform decomposition completely according to the self time scale characteristic of current signal data; a decomposition process more comprehensively extracts and maintains the main characteristics of an original signal, and meanwhile improves the conciseness and flexibility of signal expression.

Description

technical field [0001] The invention relates to the technical field of power system control, and is applicable to wind power subsynchronous oscillation detection and suppression, in particular to a wind power subsynchronous oscillation detection and suppression method based on empirical mode decomposition. Background technique [0002] The large-scale development of wind energy is an important part of my country's energy strategy. The reverse distribution of resources and load centers in my country makes the long-distance transmission of large-scale wind power inevitable. As two important ways to improve the stability limit of wind power system and improve the transmission capacity, power transmission is widely used in high-voltage transmission lines. However, when the degree of series compensation is high or when the subsynchronous control interacts with the induction power generation effect, electrical resonance with a frequency lower than the rated frequency may be generat...

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): H02J3/24H02J3/38
CPCH02J3/24H02J3/386Y02E10/76
Inventor 王瑞琪杨明辉马杰孙树敏韩德顺王昭鑫袁帅于芃李广磊赵鹏张用
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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