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

Online measurement method for generalized short-circuit ratio of multi-infeed new energy grid-connected system

A measurement method and multi-feed technology, applied in the field of electrical information, can solve the problem that generalized short circuit is more complicated than online monitoring, and achieve the effect of resisting noise interference

Active Publication Date: 2020-06-05
ZHEJIANG UNIV +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the time-varying nature of power system operation and protection requirements, the grid structure is constantly changing, which complicates the online monitoring of the generalized short-circuit ratio

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
  • Online measurement method for generalized short-circuit ratio of multi-infeed new energy grid-connected system
  • Online measurement method for generalized short-circuit ratio of multi-infeed new energy grid-connected system
  • Online measurement method for generalized short-circuit ratio of multi-infeed new energy grid-connected system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0035] According to the embodiment and its implementation process of the complete implementation of the inventive method are as follows:

[0036] Consider a wind farm with n wind turbines, such as figure 1 As shown, the current and voltage fed into the port node can be expressed as: and Denotes the i-th current fed into the port node, Indicates the voltage of the i-th feed-in port node, and j represents an imaginary number.

[0037] In this model, nodes 1~n represent n wind turbine feed-in port nodes; nodes n+1~n+m represent nodes in the wind farm that are not directly connected to wind turbines, which are called nodes in the network; the AC power grid is simplified as An infinite grid equivalent node ( figure 1 Infinite Bus).

[0038] According to the electrical network theory, the impedance between node i and node j can be expressed as: Z ij =R ...

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 an online measurement method for a generalized short-circuit ratio of a multi-infeed new energy grid-connected system. System nodes are divided into a feed-in port node, an intra-network node and an infinite power grid equivalent node, discrete time point data of current and voltage of the feed-in port node are acquired from the nodes, and then a current difference matrix and a voltage difference matrix are acquired; and a relation model between the current difference matrix and the voltage difference matrix is established through a rearranged Crocco order reduction admittance matrix, then a rearrangement matrix is solved according to a least square method matrix iterative solution, and the generalized short-circuit ratio is obtained by utilizing the rearrangement matrix. According to the generalized short-circuit ratio real-time measurement algorithm, real-time online measurement of the generalized short-circuit ratio can be achieved, and the calculation resulthas high resistance to measurement noise interference through the matrix iterative algorithm based on the least square method.

Description

technical field [0001] The invention relates to the field of electrical information technology, in particular to an online measurement method for the generalized short-circuit ratio of a multi-infeed new energy grid-connected system. Background technique [0002] With the massive integration of renewable energy generation such as photovoltaics and wind energy into the power system, various studies have been conducted on the grid-connected stability indicators of renewable energy generation at home and abroad. [0003] The generalized short-circuit ratio is one of the indicators that characterizes the relative strength and stability of the AC grid of the power electronics multi-infeed power system. According to the generalized short-circuit ratio theory, the stability margin of wind farms can be obtained only by paying attention to the grid strength and its corresponding boundaries. Therefore, understanding the generalized short-circuit ratio is helpful for the power system ...

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): G01R31/00G01R27/02
CPCG01R27/02G01R31/00
Inventor 辛焕海黄林彬王奕鑫鞠平朱承治蒙志全
Owner ZHEJIANG 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