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

Single-pole line overload control method and system for multi-terminal flexible direct current power grid

A line overload and DC power grid technology, applied in the electric power field, can solve the problems of line overload, hidden dangers of safe and stable operation of the power grid, and the inability of line power to be sent out, and achieve the effect of ensuring effective power.

Active Publication Date: 2019-07-30
国网冀北电力有限公司超高压分公司 +1
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a unipolar line fault occurs in the symmetrical bipolar flexible direct current transmission system, the power of the local pole line cannot be sent out, which will cause the line overload of the flexible direct current transmission system to appear, which will bring hidden dangers to the safe and stable operation of the power grid

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
  • Single-pole line overload control method and system for multi-terminal flexible direct current power grid
  • Single-pole line overload control method and system for multi-terminal flexible direct current power grid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] figure 1 It is a flow chart of a single-pole line overload control method for a multi-segment flexible direct current grid according to an embodiment of the present application.

[0034] Such as figure 1 As shown, the unipolar line overload control method provided in this embodiment is applied to a multi-terminal flexible DC power grid. The multi-terminal flexible DC power grid includes N converter stations connected to each other, and N is a natural number greater than or equal to 3. The overload control method includes the following steps:

[0035] When a unipolar line fault occurs in the DC power grid, it will cause the line to be overloaded. At this time, the DC circuit breaker will first cut off the faulty line, and then transfer the power of the overloaded line to the other side of the station. If it is still overloaded after transfer, transfer the power of the converter station at the sending end of the faulty line to the other pole of the station; if it is sti...

Embodiment 2

[0047] figure 2 It is a block diagram of a single-pole line overload control system for a multi-terminal flexible DC grid according to an embodiment of the present application.

[0048] Such as figure 2 As shown, in the unipolar line overload control system of the multi-terminal flexible DC grid provided by this application, the multi-terminal flexible DC grid includes N converter stations connected to each other, N is a natural number and is greater than or equal to 3, and the unipolar line overload control The system includes a first control module 10 , a second control module 20 , a third control module 30 or a fourth control module 40 .

[0049] The first control module is used to cut off the faulty line by the DC circuit breaker first when a single-pole line fault occurs in the DC power grid, and then transfer the power of the overload line sending end converter station to the other pole of the station. If the load is still overloaded after transfer, transfer the powe...

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 application discloses a single-pole line overload control method and system for a multi-terminal flexible direct current power grid. The single-pole line overload control method for the multi-terminal flexible direct current power grid specifically comprises that: when a single-pole line fault occurs in the direct current power grid, the overload phenomenon can be caused on the line; at this point, the faulty line is first cut off by a direct current breaker, and then the power of the sending end converter station of the overload line is transferred to the other pole of the station; if theload is still overloaded after the transfer, the power of the sending end converter station of the faulty line is transferred to the other pole of the station; and if the load is still overloaded after the transfer, the power of the sending end converter station of the overload line is reduced until the line overload disappears. Through the above operations, the power of the power grid can be effectively transmitted, and the overload phenomenon can be avoided.

Description

technical field [0001] The present application relates to the field of electric power technology, and more specifically, relates to a method and system for controlling overload of a single-pole line of a multi-terminal flexible direct current grid. Background technique [0002] The multi-terminal flexible DC power grid is a large-scale interconnection of multiple converter stations, which can realize bidirectional power transmission and achieve reasonable power distribution at the same time, enhancing the flexibility and reliability of the system. When a unipolar line fault occurs in the symmetrical bipolar flexible direct current transmission system, the power of the local pole line cannot be sent out, which will cause the line overload of the flexible direct current transmission system to appear, which will bring hidden dangers to the safe and stable operation of the power grid. Contents of the invention [0003] In view of this, the present application provides a single...

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): H02H7/26
CPCH02H7/268
Inventor 田凯哲李振动贺俊杰樊小伟刘亚新王珣安海清李金卜张晓飞金海望吴淘岳娜柳杨翟永尚滕孟锋董海飞余黎明刘宪辉刘海勇李涛赵凯曼赵佳鑫刘洁范彩杰周紫薇高宏达
Owner 国网冀北电力有限公司超高压分公司