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

Self-bypass type fault current limiter and control method thereof

A fault current limiter and control method technology, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. The problems of large loss and large floor space of the DC current limiter can achieve the effect of flexible transfer, saving investment and small loss resistance.

Inactive Publication Date: 2019-08-27
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the large loss and poor economy of the solid-state DC current limiter in the prior art and the high cost and large footprint of the hybrid DC current limiter, the present invention provides a self-bypass fault current limiter and its control method, the self-bypass type fault current limiter includes a current branch, a current transfer branch and a current limiting branch

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
  • Self-bypass type fault current limiter and control method thereof
  • Self-bypass type fault current limiter and control method thereof
  • Self-bypass type fault current limiter and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1 of the present invention provides a self-bypass type fault current limiter, which specifically includes a current flow branch, a current transfer branch and a current limiting branch. The functions of each branch are as follows:

[0045] The current-through branch is used to realize the conduction of the steady-state current of the DC line when the DC line is in normal operation, and transfer the fault current to the current-limiting branch after detecting a fault in the DC line;

[0046] Among them, the current transfer branch is used to carry the fault current transferred by the flow-through branch, and force the current-limiting element in the current-limiting branch to connect to the DC line;

[0047] Among them, the current-limiting branch is used to increase the system damping and reduce the rising speed of the fault current after being connected in series with the DC line.

[0048]The flow-through branch above includes a fast isolating switch K1 and ...

Embodiment 2

[0054] Embodiment 2 of the present invention provides a control method of a self-bypass type fault current limiter, and the specific process is as follows:

[0055] The DC line where the self-bypass type fault current limiter is located is in normal operation and before the fault is detected, the IGBT1 and IGBT2 in the current-passing branch are turned on, the IGBTs in the current transfer branch are all blocked, the current-limiting branch is out of operation, and the current-limiting branch is out of operation. IGBT1 and IGBT2 in the flow branch are turned on, the steady state current or fault current flows through the flow branch, the DC line operates normally and before a fault occurs on the DC line where the self-bypass fault current limiter is detected, the steady state The current or fault current flows through the flow-through branch, and the schematic diagram of the flow path of the DC line fault current before the fault is detected is shown in figure 2 shown.

Embodiment 3

[0057] The control method of the self-bypass type fault current limiter provided by Embodiment 3 of the present invention is suitable for detecting a fault on the DC line where the self-bypass type fault current limiter is located, and the specific process is as follows:

[0058] S101: All IGBTs in the current-passing branch are turned off, all sub-modules in the current transfer branch are turned on, and all capacitors in the single-clamp sub-module are in a bypass state. The schematic diagram of the fault current flow path is as follows image 3 shown;

[0059] S102: Block all sub-module IGBTs in the main branch circuit. At this time, the capacitors in the main branch circuit are connected in series to facilitate fast charging. The current-limiting reactor and the capacitor are connected in parallel at this time, and the increase of the capacitor voltage will cause the fault current to transfer to the reactor. The schematic diagram of the flow path of the fault current is a...

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 provides a self-bypass type fault current limiter and a control method thereof. The self-bypass type fault current limiter comprises a current passing branch, a current transfer branch and a current limiting branch. A full-control type device is adopted, the logic is simple, and the controllability is high; the current transfer branch of the current limiter comprises a brand-new single-clamp sub-module with a single-quadrant operation capability of two-way bypass and one-way clamp. An action process of the current limiter does not depend on a protection effect of a lightning arrester, so that the service life of the current limiter is effectively prolonged. According to the control method of the self-bypass type fault current limiter, the self-bypass type fault current limiter is controlled during normal operation of a direct current line where the current limiter is located or before and after detection of a fault of the direct current line where the current limiter is located.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a self-bypass fault current limiter and a control method thereof. Background technique [0002] Due to its unique advantages in technology and economy, high voltage direct current (HVDC) has been widely used in long-distance large-capacity power transmission and regional networking in my country. HVDC transmission not only has many characteristics such as grid stability and reliability, but also facilitates the large-scale access of distributed energy. However, due to the inability to take good countermeasures when the system fails, the development of the DC power grid is limited. The main technical difficulty is that the high-voltage and large-capacity DC current limiter technology is still immature. Therefore, it has become a research hotspot at home and abroad to study a device that can limit the rapid rise of DC current and reduce the pressure on all levels of equ...

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): H02H9/02
CPCH02H9/02
Inventor 赵成勇宋冰倩赵西贝许建中
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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