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

A preventive control method for long-term voltage stability based on sequential optimal power flow method

A technology of optimal power flow and voltage stability, applied in AC network circuits, forecasting, electrical components, etc., can solve problems such as unbalanced reactive power distribution, system collapse, etc., to reduce decision-making time, formulate accurate, and avoid potential effects.

Inactive Publication Date: 2017-05-17
SHANDONG UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of heavy loads, if all node voltages are forced to be within a certain fixed range, it may lead to long-distance transmission of reactive power to ensure the voltage level of some nodes, which will lead to uneven reactive power distribution. balance, and even cause the system to crash

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 preventive control method for long-term voltage stability based on sequential optimal power flow method
  • A preventive control method for long-term voltage stability based on sequential optimal power flow method
  • A preventive control method for long-term voltage stability based on sequential optimal power flow method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0051] Aiming at the shortcomings that the current voltage prevention and control methods fail to comprehensively consider the load change trend within a period of time and the reactive power distribution balance, the present invention provides an effective long-term voltage prevention and control method, so as to prevent long-term voltage failure stable accidents.

[0052] Such as figure 1 As shown, the present invention formulates a two-layer time frame based on the optimal power flow method to construct the time-series optimal power flow method. The upper frame is the ultra-short-term load forecasting and voltage situation control part, which is used to screen the expected accident set for the system, The selection of voltage situation control nodes and the setting of the voltage constraint range provide constraint decision-making for the lower layer; the...

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 long term voltage stability prevention and control method based on a time sequence optimal power flow method; the long term voltage stability prevention and control method comprises the following steps: using a load prediction start point as a prevention point, carrying out line fault screening pretreatment, building a grey load prediction model, and obtaining a predicted load curve in the time period; carrying out preconception accident set screening according to the predicted load curve; employing a system power flow equation minimum modulus characteristic value, in a maximum load Lmax portion of the predicted load curve, to carry out node classification for load node injection variable sensitivity, determining a node voltage to constrain an upper boundary and a lower boundary, and using transmission loss as a target function to do optimal power flow calculation; carrying out super-short term load forecast in the time period of h1-h2 at a new prevention point h1 when the lower time reaches the new prevention point h1. The beneficial effects are that the method provides a voltage state and tendency following control concept, so key load nodes can be monitored, thus making more effective idle balance and voltage safety control measures under heavy load conditions.

Description

technical field [0001] The invention relates to the field of power system operation and control, in particular to a long-term voltage stability preventive control method based on the sequential optimal power flow method. Background technique [0002] The frequent occurrence of power system voltage instability accidents in recent years has brought new challenges to the safe and stable operation of the power system. These accidents are characterized by a relatively long continuous voltage drop process during the development of the accident. In order to prevent the occurrence of long-term voltage instability accidents, it is necessary to formulate reasonable and effective long-term voltage prevention and control strategies. The formulation of the long-term voltage instability prevention and control strategy needs to ensure the accuracy of the calculation and be able to adapt to the requirements of on-line applications. Currently, there is no effective prevention and control str...

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): H02J3/00G06Q10/04G06Q50/06
CPCY02E40/70Y04S10/50
Inventor 张文王超
Owner SHANDONG UNIV
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