Power system voltage sag level evaluation method with consideration of phase jump

A technology of phase jump and voltage sag, which is applied in the direction of measuring electricity, fault location, and measuring electrical variables, etc., which can solve the problems that the individuality of the monitoring cycle cannot be ruled out, and the phase jump cannot be reflected.

Active Publication Date: 2016-06-22
STATE GRID FUJIAN ELECTRIC POWER CO LTD +3
View PDF4 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also cannot rule out the individuality of a specific monitoring period, and th

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
  • Power system voltage sag level evaluation method with consideration of phase jump
  • Power system voltage sag level evaluation method with consideration of phase jump
  • Power system voltage sag level evaluation method with consideration of phase jump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] This implementation provides a method for evaluating the voltage sag level of a power system considering phase jumps, which specifically includes the following steps:

[0045] Step S1: Determine the fault condition for Monte Carlo simulation;

[0046] Step S2: According to the fault condition determined in step S1, based on the voltage sag divider model, calculate the sag amplitude and phase jump angle;

[0047] Step S3: Making the calculation results in step S2 into a preliminary statistical table of sag amplitude and phase jump and a subdivided statistical table;

[0048] Step S4: Form the calculation result into a graphical representation considering amplitude and phase jumps.

[0049] In this embodiment, the step S1 determines the fault conditions for Monte Carlo simulation by generating random numbers, simulating different impedance angles...

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 power system voltage sag level evaluation method with consideration of a phase jump. The method comprises: S1, a fault condition of Monte Carlo simulation is determined; S2, according to the fault condition determined at the S1, a sag amplitude and a phase jump angle are calculated based on a voltage sag voltage-dividing model; S3, a preliminary statistical table and subdivision statistical table for the sag amplitude and phase jump are formulated based on the calculation results obtained by the S2; and S4, the calculation results are processed and thus are expressed graphically with consideration of the amplitude and phase jump. According to the invention, uncertain factors of an impedance angle between the fault line impedance and the system impedance, a fault distance, a fault type, and a conversion effect on a sag type by a transformer are taken into consideration; multi-times short-circuit calculation is carried out based on a Monte Carlo simulation method and a sag amplitude and a phase jump of a concerned node are calculated; the statistical tables and statistic graphs that consider the sag amplitude and phase jump are introduced; and the results are expressed in graphs to realize direct observation and detailed comparison.

Description

technical field [0001] The invention relates to the field of power system power quality evaluation, in particular to a power system voltage sag level evaluation method considering phase jumps. Background technique [0002] Voltage sag is an inevitable power quality disturbance event in the power system, and is considered to be the most serious power quality problem. As more and more electrical equipment sensitive to voltage sags, and intermittent power sources such as wind power and solar power are connected to the grid, the economic losses and social impact caused by voltage sags are increasing, which has caused power supply companies and power users and extensive attention from academia. Evaluating the voltage sag level of the power system or concerned nodes can help power supply companies and power users to predict potential sag hazards and take necessary measures to avoid or mitigate the risks caused by voltage sags. [0003] The voltage sag assessment can be divided i...

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): G01R31/08
CPCG01R31/088
Inventor 张逸黄道姗吴丹岳林焱肖先勇林芳欧然刘远帆
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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