Unlock instant, AI-driven research and patent intelligence for your innovation.

Longitudinal protection method and system for offshore wind power direct current transmission line

A technology for outgoing line and longitudinal protection, applied in circuit devices, AC network circuits, emergency protection circuit devices, etc., to achieve the effects of weak influence, good engineering application value, and high operational reliability

Pending Publication Date: 2022-05-10
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +2
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method and system for longitudinal protection of offshore wind power direct current transmission lines, which solves the problems disclosed in the background technology

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
  • Longitudinal protection method and system for offshore wind power direct current transmission line
  • Longitudinal protection method and system for offshore wind power direct current transmission line
  • Longitudinal protection method and system for offshore wind power direct current transmission line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0051] Such as figure 1 As shown, a method for longitudinal protection of offshore wind power direct current transmission lines includes the following steps:

[0052] Step 1, in response to determining a line fault, calculating a line voltage fault component and a line current fault component according to the line voltage after the fault, the line current after the fault, the line voltage before the fault, and the line current before the fault;

[0053] Step 2, according to the line voltage fault component and the line current fault component, calculate the fault forward wave and the fault reverse wave;

[0054] Step 3. Calculate the similarity of the traveling wave waveform according to the f...

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 pilot protection method and system for an offshore wind power direct current transmission line, and the method comprises the steps: calculating the waveform similarity of a traveling wave according to a fault forward traveling wave and a fault reverse traveling wave, and achieving the pilot protection of the line according to the waveform similarity of the traveling wave. Therefore, the action reliability is high, the influence of transition resistance is weak, the sampling frequency requirement is not high, the algorithm is simple, the method can be suitable for the novel characteristics that the topological structure of the offshore wind power full-direct-current collecting and sending-out system is complicated, the commutation links are diversified, and the boundary characteristics are weakened, and the method has good engineering application value.

Description

technical field [0001] The invention relates to a method and system for longitudinal protection of offshore wind power direct current transmission lines, belonging to the field of electric power systems. Background technique [0002] Offshore wind power full DC collection and transmission is the development trend of large-scale offshore wind farm grid connection in the future. At present, there are no practical engineering cases, and there are still many key technical problems that need to be studied and solved urgently, and relay protection is one of them. Among them, the sending line undertakes the task of power transmission, and the research on the relay protection strategy of the sending line is of great significance to ensure the system's operational performance and safety, and to promote the development and application of technology. [0003] The fault development and spread of the offshore wind power full DC transmission line is fast and the impact range is large. In ...

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): H02H7/26H02J3/38
CPCH02H7/268H02J3/381H02J2300/28
Inventor 孔祥平张弛李鹏王晨清宾子君郑俊超周琦
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST