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Differential protection method, device and system for differential protection service of power distribution network

A differential protection and distribution network technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as communication link transmission delay fluctuations

Pending Publication Date: 2021-04-20
STATE GRID ZHEJIANG ELECTRIC POWER +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, any wireless communication technology (including 5G communication) has fluctuations in the transmission delay of communication links caused by changes in the wireless propagation environment, and it is impossible to keep the delay performance within an acceptable range.

Method used

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  • Differential protection method, device and system for differential protection service of power distribution network
  • Differential protection method, device and system for differential protection service of power distribution network
  • Differential protection method, device and system for differential protection service of power distribution network

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Embodiment Construction

[0073] The specific implementation manners of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the embodiments of the present invention, and are not intended to limit the embodiments of the present invention.

[0074] Such as figure 1 Shown is a structural block diagram of a differential protection system for distribution network differential protection services according to an embodiment of the present invention. exist figure 1 Among them, the differential protection system may include at least two differential protection devices 10 . Wherein, one of the two matching differential protection devices can be set at one end of the distribution network line, and the other can be set at the other end of the distribution network line.

[0075] When the differential protection system is work...

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Abstract

The embodiment of the invention provides a differential protection method, differential protection equipment and a differential protection system for a power distribution network differential protection service, and belongs to the technical field of operation and maintenance of power distribution lines. The differential protection method comprises the following steps: respectively sending first current phasor information and a first monitoring heartbeat packet; respectively receiving second current phasor information and a second monitoring heartbeat packet which are fed back from the outside; respectively determining communication time delay and communication stability according to the first monitoring heartbeat packet and the second monitoring heartbeat packet; selecting first current phasor information sent by one of the main sending wireless line and the standby sending wireless line and second current phasor information received by one of the main receiving wireless line and the standby receiving wireless line according to the communication time delay and the communication stability; according to the selected first current phasor information and second current phasor information, determining whether the power distribution network line has a fault or not; and executing tripping operation on the power distribution network line under the condition that the power distribution network line is judged to have the fault.

Description

technical field [0001] The invention relates to the technical field of operation and maintenance of distribution lines, in particular to a differential protection method for differential protection services of distribution networks. Background technique [0002] The final distribution link of power energy transmission in the distribution network, the safety and reliability of the distribution network have a huge impact on the quality of people's lives and industrial production. Relay protection can sense and isolate quickly when a fault occurs in the power grid, thus ensuring the safe and stable operation of the power grid. With the continuous penetration of distributed new energy applications, the power grid has changed from the traditional one-way energy flow to two-way flow, the electrical topology complexity of the distribution network has continued to deepen, and the power electronic characteristics of the power grid brought about by the AC-DC hybrid connection have bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCY04S40/126
Inventor 段凌霄林晓亮赵永生王信佳徐阳洲卢杉刘晨阳孔文杰邱兰馨吕玉祥董亚文吴昊郭力旋
Owner STATE GRID ZHEJIANG ELECTRIC POWER
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