Differential protection method and system suitable for communication delay uncertainty

A differential protection and uncertainty technology, which is applied in information technology support systems, emergency protection devices with automatic disconnection, emergency protection circuit devices, etc., can solve problems such as reduced reliability and uncertainty in communication delays, and achieve The effect of improving reliability and extending the time window

Pending Publication Date: 2022-07-08
SHENZHEN POWER SUPPLY BUREAU
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a differential protection method and system suitable for communication delay uncertainty, so as to solve the problem of reduced reliability caused by communication delay uncertainty when performing differential protection in communication mode

Method used

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  • Differential protection method and system suitable for communication delay uncertainty
  • Differential protection method and system suitable for communication delay uncertainty
  • Differential protection method and system suitable for communication delay uncertainty

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Embodiment Construction

[0026] The following descriptions of the various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the invention may be practiced.

[0027] Please refer to figure 1 As shown, Embodiment 1 of the present invention provides a differential protection method suitable for communication delay uncertainty, including:

[0028] Step S1, the differential protection device on this side stores the real-time sampling data in different pre-divided data cache areas according to the distance from the current sampling moment;

[0029] Step S2, receiving the real-time sampling data sent by the opposite-side differential protection device through a communication channel with unknown delay, and matching the same sampling data from the data buffer of the local-side differential protection device according to the sampling time of the opposite-side differential protection device The real-time sampling data of the local side at the moment, and calculate the d...

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Abstract

The invention discloses a differential protection method and system suitable for communication delay uncertainty, and the method comprises the steps: enabling a differential protection device at a side to store real-time sampling data into different data cache regions which are divided in advance according to the distance between the real-time sampling data and a current sampling moment; receiving real-time sampling data sent by an opposite-side differential protection device through a communication channel with unknown time delay, and matching local-side real-time sampling data at the same sampling moment from a data cache region of a local-side differential protection device according to the sampling moment of the opposite-side differential protection device; and calculating the extraction rate required by the opposite-side real-time sampling data and extracting, and then carrying out differential protection calculation on the extracted opposite-side real-time sampling data and the matched local-side real-time sampling data. According to the invention, the sampling data of a longer time window can be stored in a cache space with a fixed size, the judgment time window of differential protection is prolonged, and the reliability of differential protection and the adaptability to communication delay are improved.

Description

technical field [0001] The invention belongs to the technical field of power system relay protection, and in particular relates to a differential protection method and system suitable for communication delay uncertainty. Background technique [0002] In the traditional differential protection of power system, after the time synchronization of the protection devices on both sides of the protection area, the protection devices on both sides send the sampling values ​​including the sampling time collected by each other in the optical fiber mode, and the protection device on the side receives the sampling value of the opposite side. After the sampling value is obtained, the sampling value that is the same as the sampling time of the sampling value of the opposite side is selected in the data buffer area of ​​the device on the local side, and the differential protection is judged according to the two sets of data. [0003] At present, the data transmission of differential protect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/28
CPCH02H7/263H02H3/28Y04S40/126
Inventor 王廷凰刘子俊彭毅徐骏乔峰郭乐欣周建勇周余涵
Owner SHENZHEN POWER SUPPLY BUREAU
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