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

Low-frequency oscillation disturbance source positioning method considering steady state point time varying

A technology of disturbance source location and low-frequency oscillation, applied in the direction of fault location, etc., can solve problems such as difficult to apply

Inactive Publication Date: 2017-03-15
STATE GRID CORP OF CHINA +3
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing disturbance source location criterion is difficult to apply to this type of oscillation, and the accuracy of location can only be guaranteed when the steady-state operating point changes little

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
  • Low-frequency oscillation disturbance source positioning method considering steady state point time varying
  • Low-frequency oscillation disturbance source positioning method considering steady state point time varying
  • Low-frequency oscillation disturbance source positioning method considering steady state point time varying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0153] (1) Take the Central China Power Grid as an example to verify the steady-state point identification, energy decomposition, and disturbance source location methods proposed in the present invention. Set the units of Jinxi Power Plant in Sichuan Province as the disturbance source, and weaken the damping of the units in the plant by modifying the generator control system parameters and increasing the power plant's outgoing reactance. A fault-free disconnection was set for one of the three outgoing lines of the power plant, causing negative damping oscillation. After the oscillation starts, the mechanical power of 5 units is increased through the quick-closing valve. The climbing speed is divided into 3 stages: 0~7s is 0.92% / s; 7s~12s is 0; 12s~18s is 1.67% / s.

[0154] (2) Identification of steady-state points

[0155] Take the identification of the electromagnetic power steady-state point of Unit 1 in Jinxi Power Plant as an example. Based on the principle of acceleration and...

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 a low-frequency oscillation disturbance source positioning method considering steady state point time varying. The low-frequency oscillation disturbance source positioning method comprises the steps of extracting network data; constructing an energy function; identifying a stable point; performing energy decomposition and calculation; and judging the location of a oscillation disturbance source. According to the method provided by the invention, decomposition is performed on components contained in the energy function through mathematical derivation, components which are irrelevant to disturbance source positioning, such as state energy and reciprocating oscillation energy, are excluded, and the position of the disturbance source can be judged according to the propagation direction of dissipated energy.

Description

Technical field [0001] The invention relates to a disturbance source locating method, in particular to a low-frequency oscillation disturbance source locating method considering the time-varying of a steady-state point. Background technique [0002] Low-frequency oscillation has become an important issue affecting the safe and stable operation of modern large-scale power systems. During the operation of domestic and foreign power grids, there have been many serious low-frequency oscillation accidents, including negative damping oscillations and forced power oscillations. Negative damping oscillation is caused by the negative damping of the generator control system itself being excited by small disturbances. Since the swing of the disturbed generator rotor cannot be calmed down autonomously, the system appears as a continuous amplitude oscillation. For the negatively damped oscillation caused by the local disturbance source, if the disturbance source is not removed, the oscillati...

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 Applications(China)
IPC IPC(8): G01R31/08
Inventor 张文朝商显俊奚江惠邵德军
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