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On-line exit method, device, system and storage medium of multi-terminal DC system

A multi-terminal DC, storage medium technology, applied in the direction of DC network circuit devices, circuit devices, electrical components, etc., can solve the problems of false trigger system protection, empty charging, etc., and achieve the effect of avoiding empty charging

Active Publication Date: 2022-02-18
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the existing technology scheme, when the system as a whole satisfies the exit conditions, the exit control will be carried out, and the system may be restarted in advance before the high-voltage line and the low-voltage line are isolated, and the DC terminal of the transport will be restarted in advance, resulting in high-voltage lines, The low-voltage line is empty-charged, which may falsely trigger the protection of the system

Method used

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  • On-line exit method, device, system and storage medium of multi-terminal DC system
  • On-line exit method, device, system and storage medium of multi-terminal DC system

Examples

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Embodiment 1

[0036] The present invention provides an on-line withdrawal method for a multi-terminal DC system, please refer to figure 1 , figure 1 It is a schematic flow chart of a preferred embodiment of an online decommissioning method for a multi-terminal DC system provided by the present invention; specifically, the method includes:

[0037] S100. Control the system characteristics of the multi-terminal DC system according to the disconnection conditions of each separation point device between the high-voltage line and the low-voltage line of the online exit end and the multi-terminal DC system;

[0038] S200. When the system characteristics meet the disconnection conditions of each of the separation point devices at the same time, send a disconnection command to each of the separation point devices to control each of the high-voltage lines and the low-voltage lines. - said separation point device is disconnected;

[0039] S300. After each of the separation point devices on the high...

Embodiment 2

[0057] The present invention also provides an online station withdrawal device for a multi-terminal DC system, please refer to figure 2 , figure 2 It is a schematic structural diagram of a preferred embodiment of an online decommissioning device for a multi-terminal DC system provided by the present invention; specifically, the device includes:

[0058] The control module 11 is used to control the system characteristics of the multi-terminal DC system according to the disconnection conditions of each separation point device between the high-voltage line and the low-voltage line and the multi-terminal DC system at the online exit end;

[0059] The sending module 12 is configured to send a disconnection command to each of the separation point devices respectively when the system characteristics simultaneously satisfy the disconnection conditions of each of the separation point devices, so as to control the disconnection between the high voltage line and the low voltage line. ...

Embodiment 3

[0072] The present invention also provides a multi-terminal DC system, the system includes N DC sending terminals and M DC receiving terminals, and the N DC transmitting terminals and M DC receiving terminals are connected through a DC bus and a DC line;

[0073] The system also includes a controller, the controller is configured to execute any one of the multi-terminals provided in Embodiment 1 above when there is any one of the DC sending terminals or any one of the DC receiving terminals as an online exit terminal. The online exiting method of the DC system controls the online exiting end to perform online exiting.

[0074] The multi-terminal DC system provided by the present invention considers the disconnection conditions of the high-voltage line and the low-voltage line of the metal loop when the line exit terminal exits, and controls the disconnection point device disconnection when the system characteristics meet the disconnection conditions. Open, it can ensure that t...

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PUM

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Abstract

The invention discloses an online withdrawal method, device, system and storage medium of a multi-terminal direct current system, wherein the method includes: disconnection of devices at each separation point between the high-voltage line and the low-voltage line of the online exit end and the multi-terminal direct current system to control the system characteristics of the multi-terminal DC system; when the system characteristics meet the disconnection conditions of each of the separation point devices at the same time, send a disconnection command to each of the separation point devices to control the Each of the separation point devices on the high-voltage line and the low-voltage line is disconnected; when each of the separation point devices on the high-voltage line and the low-voltage line is disconnected, the multi-terminal DC The system takes control. The invention can prevent the system from being restarted in advance before the high-voltage line and the low-voltage line at the online exit end are isolated, and prevent the high-voltage line and low-voltage line from being empty-charged and the protection of the system being falsely triggered due to the early restart of the system.

Description

technical field [0001] The present invention relates to the field of multi-terminal direct current systems, and in particular to an online decommissioning method, device, system and storage medium for multi-terminal direct current systems. Background technique [0002] In a multi-terminal DC system with multiple DC sending ends and DC receiving ends, it is often necessary to isolate a certain DC sending end or DC receiving end based on system operation requirements or maintenance requirements, and control a certain sending end or receiving end to exit online. The system can be flexibly scheduled and run. [0003] In the prior art, when performing online decommissioning control on a multi-terminal DC system, the control strategy usually only considers the status of the system as a whole. Reboot and restore system homeostasis. [0004] However, the current multi-terminal DC system has a metal return line operation mode and a ground return line operation mode, wherein, in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/00
CPCH02J1/00
Inventor 曾冠铭李书勇林雪华陈钦磊罗超卢远宏刘志江陈德扬
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD