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

Large-scale battery storage power station interface protection method based on single-ended break variable of current

A technology of battery energy storage and single-ended current, which is applied in the direction of protection against overcurrent, etc., can solve problems such as unsuitable use, large impedance value of energy storage power station, etc., and achieve the effect of improving reliability

Active Publication Date: 2013-04-17
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
View PDF2 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the neutral point of my country's distribution network is usually not directly grounded, and the equivalent impedance value of the energy storage power station is relatively large in the event of a fault, the negative sequence current and zero sequence current are relatively small, so this criterion is not suitable for use

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
  • Large-scale battery storage power station interface protection method based on single-ended break variable of current
  • Large-scale battery storage power station interface protection method based on single-ended break variable of current
  • Large-scale battery storage power station interface protection method based on single-ended break variable of current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] Best embodiment:

[0039] The interface protection method of large-scale battery energy storage power station based on the sudden change of single-ended current includes the following steps:

[0040] (1) Provide current transformers and voltage transformers, which are connected to the interface protection installation place, collect the three-phase current and three-phase voltage at the protection installation place, as the power required for the protection element, and the current transformer wiring form adopts standard wiring ;

[0041] (2) The current value and the phase difference between current and voltage at the previous time are recorded by the memory element, and the value collected at the next time is used as a reference;

[0042] (3) Calculate the difference between the current and phase at this moment and the current and phase value at the previous moment, and compare the current sudden changes;

[0043] (4) Compare the sudden change of current with the setting value...

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 protection starting method for an interface between a large-scale energy storage power station and a power grid, in particular to a large-scale battery storage power station interface protection method based on single-ended break variable of current. According to the method provided by the invention, the single-ended break variable of current is utilized to provide protection for the large-scale battery storage power station interface, only the single-ended current and voltage information quantities are needed; and the problems that the distributed power supply which is tied in grids through an inverter is low in reliability and sensitiveness while using the conventional three-section current protection and current sequence component are solved; under various fault conditions, the fault can be reliably detected, the simulation result shows that the method has higher protective sensitiveness and reliability, and the fault can be removed by reliable actions in two-phase short circuit, two-phase grounded short circuit and three-phase short circuit outside the grid.

Description

Technical field [0001] The invention relates to a protection start method for the interface of a large energy storage power station and a power grid, in particular to a protection method for the interface of a large battery energy storage power station based on a single-ended current mutation. Background technique [0002] With the continuous consumption of traditional fossil energy and the continuous serious environmental pollution, the technological development of new energy has become one of the signs of the development of the times. As a distributed power source with strong operational stability, battery energy storage power station can achieve a stable power output when mixed with other volatile distributed power sources; for large battery energy storage power stations (capacity greater than 1MW), generally The line is directly connected to the distribution network, which plays a role in peak regulation and valley filling of the grid. [0003] When the external power grid fai...

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): H02H3/08
Inventor 吴文宣
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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