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

A Short-Circuit Fault Handling Method for Flexible DC Grid Based on Combined HVDC Circuit Breaker

A high-voltage direct current and short-circuit fault technology, applied in the field of power system, can solve the problems of large fault current of circuit breakers, reduce the application prospect of combined high-voltage direct current circuit breakers, increase the manufacturing cost of circuit breakers, etc. The effect of reducing the number of power electronic devices and reducing investment costs

Active Publication Date: 2018-08-24
ZHEJIANG UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned combined HVDC circuit breaker is more suitable for the application of DC power grid than the hybrid HVDC circuit breaker. However, the control strategy proposed in this document only relies on the circuit breakers at both ends of the faulty line to clear the fault when the DC line fails. The fault current required to be broken by the circuit breaker is relatively large, which increases the manufacturing cost of the circuit breaker, which undoubtedly reduces the application prospect of the combined high-voltage DC circuit breaker

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
  • A Short-Circuit Fault Handling Method for Flexible DC Grid Based on Combined HVDC Circuit Breaker
  • A Short-Circuit Fault Handling Method for Flexible DC Grid Based on Combined HVDC Circuit Breaker
  • A Short-Circuit Fault Handling Method for Flexible DC Grid Based on Combined HVDC Circuit Breaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] In order to describe the present invention more specifically, the technical solutions and related principles of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] The application occasion of the combined high-voltage direct current circuit breaker-based DC side short-circuit fault coordinated processing strategy of the present invention is a flexible direct-current power grid equipped with a combined high-voltage direct current circuit breaker connected by an overhead line based on a voltage source converter. exist figure 1 In the shown case, the DC grid contains 4 flexible DC converter stations. The flexible DC converter stations are connected by overhead lines. The converter station adopts the true bipolar arrangement, and for the convenience of analysis, the converter stations are all the positive poles of the true bipolar. The configuration of the combined high-voltage DC circuit...

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 a short circuit fault processing method for a flexible DC power grid based on a combined-type high-voltage DC circuit breaker. The method can carry out the preset switching-off operation of the combined-type high-voltage DC circuit breaker in the power grid according to a preset threshold value of a set current transfer switch when a DC fault happens to one line in the DC power grid and before the positioning of the system fault is completed. After the fault positioning and detection are completed, the method carries out subsequent operation for circuit breakers at two ends of a non-fault line and a fault line, so as to achieve the isolation of a DC fault. Therefore, the method can effectively improve the cutoff potential of the combined-type high-voltage DC circuit breaker in the power grid. Compared with a conventional processing method, the method can effectively reduce the cutoff pressure of the circuit breakers at two sides of the fault line, reduces the design requirements for the circuit breakers, and reduces the investment for the circuit breakers, so as to effectively improve the application prospect of the combined-type high-voltage DC circuit breaker.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a short-circuit fault processing method of a flexible DC power grid based on a combined high-voltage DC circuit breaker. Background technique [0002] As the global energy shortage and environmental degradation continue to aggravate, the development and utilization of renewable energy has gradually received extensive attention from countries all over the world. However, limited by the capacity of the power system, most of the renewable energy has not been effectively utilized, and the phenomenon of "abandoning wind" and "abandoning light" occurs frequently; on the other hand, wind power, solar energy and other new energy power generation are intermittent and random , which makes traditional power equipment, grid structure and operation technology more and more incapable of accepting ultra-large-scale renewable energy. In order to solve the problem of g...

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 Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 徐政刘高任许烽张哲任
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