Adaptive re-switching-on method for flexible DC transmission system with DC circuit breaker

A technology of DC circuit breaker and power transmission system, applied in the direction of automatic disconnection of emergency protection devices, electrical components, circuit devices, etc., can solve the problem of low reliability, achieve high universality, improve safety and power supply reliability , the effect of reducing requirements

Inactive Publication Date: 2019-08-16
HUAZHONG UNIV OF SCI & TECH
View PDF3 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the defects of the prior art, the purpose of the present invention is to provide an adaptive reclosing method for a flexible direct

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
  • Adaptive re-switching-on method for flexible DC transmission system with DC circuit breaker
  • Adaptive re-switching-on method for flexible DC transmission system with DC circuit breaker
  • Adaptive re-switching-on method for flexible DC transmission system with DC circuit breaker

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0032] figure 1 It is a flexible DC transmission system topology adopted in the embodiment of the present invention. The sub-module adopts a half-bridge structure, and a hybrid high-voltage DC circuit breaker with fast breaking speed and small on-state loss is installed on both sides of the line. In order to limit the magnitude of the fault current, current-limiting reactors are installed on both sides of the line with a size of 0.1H. The system is a symmetrical bipolar system, and overhead lines (OHL) adopt a frequency-dependent model. Among them, MMC1 station adopts constant DC voltage co...

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 adaptive re-switching-on method for a flexible DC transmission system with a DC circuit breaker. The method comprises the steps of: after a DC fault occurs and the DC circuit breaker operates, ensuring the de-ionization of a fault line after a preset delay; in initiative cooperation with the circuit breaker, injecting, by a current converter, a voltage signal into the fault line by active control, detecting the polarity of reflected voltage, and if the polarity of the reflected voltage is the same as the polarity of the voltage signal, determining that the fault is atransient fault and re-switching on the fault line; if the polarity of the reflected voltage is opposite to the polarity of the voltage signal, determining that the fault is a permanent fault, not re-switching on the fault line and locating the fault. The adaptive re-switching-on method determines whether to re-switch on the circuit breaker by determining the fault property so as to prevent secondary impact on the system caused by re-switching on the circuit breaker in the event of the permanent fault, can clearly distinguish all fault types based on the polarity of the reflected voltage, andachieves high reliability.

Description

technical field [0001] The invention belongs to the field of flexible direct current transmission, and more specifically relates to an adaptive reclosing method for a flexible direct current transmission system including a direct current circuit breaker. Background technique [0002] Based on MMC (Modular multilevel converter), DC transmission technology with its modular structure, low harmonic content, self-starting, power decoupling control, low switching loss, etc. , asynchronous interconnection, urban power grid capacity expansion, power supply to passive systems, and connection to weak AC power grids have broad application scenarios. Considering the power transmission distance, voltage level and cost issues, flexible DC systems often use overhead lines for large-scale power transmission. The working environment of overhead lines is harsh, and the probability of failure is high; at the same time, the fault current rises rapidly and has a large amplitude, which will caus...

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): H02H7/26H02H3/06H02J3/36
CPCH02H3/066H02H7/268H02J3/36Y02E60/60
Inventor 文劲宇杨赛昭向往
Owner HUAZHONG UNIV OF SCI & TECH
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