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Three-end line optical differential synchronous phase algorithm based on sampling circle

A synchrophasor and optical fiber technology, applied in circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of time-consuming algorithms and low accuracy, and achieve simple algorithms and strong applicability , less time-consuming effect

Inactive Publication Date: 2008-09-10
DONGFANG ELECTRONICS
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Problems solved by technology

[0004] At present, other three-terminal or multi-terminal synchronization algorithms use multiple two-terminal ping-pong synchronization algorithms, which take a long time and have low accuracy.

Method used

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  • Three-end line optical differential synchronous phase algorithm based on sampling circle
  • Three-end line optical differential synchronous phase algorithm based on sampling circle
  • Three-end line optical differential synchronous phase algorithm based on sampling circle

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0021] Three-terminal line optical fiber differential protection as attached figure 1 As shown, each of their devices uses optical fiber to communicate in pairs, and each device can receive the communication traffic sent by the other two peers from their respective fiber channels, and then analyze the data packets of each peer in each device, using these The data is passed through the three-terminal line optical fiber differential synchrophasor algorithm based on the sampling circle to find the three-terminal AC phasor at the same time.

[0022] Each device sends data to each optical fiber port every fixed time (that is, an interruption), and the frame of a packet of data includes the AC voltage, AC cut-off, sending and receiving delay, and the local end at this moment. See Table 1 for details of the sampling label, peer sampling label, some acti...

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Abstract

The invention discloses a three terminal line fiber differential synchronized phasor algorithm based on a sampling circle. Every two in the three terminal line are communicated by fiber channels, each device can receive alternating quantity sent by other two opposite terminals through respective fiber channels and the data packet of each opposite terminal is resolved in each device; the data pockets are calculated by the three terminal line fiber differential synchronized phasor algorithm based on a sampling circle to find out three terminal alternating current quantity at the same time one time then the alternating current quantity of the same time is used for judging whether the AC transmission line has fault inside the sample space or not.

Description

technical field [0001] The invention relates to a three-terminal line optical fiber differential synchronous phasor method based on a sampling circle in a power system. Background technique [0002] With the further development of the economy, it is often necessary to build new substations on the basis of existing lines. The broken line will form a three-terminal line, and there will be more and more three-terminal lines. Among the protection functions currently used for lines, the principle of line optical fiber differential is the best way to achieve its main protection. Moreover, optical fiber digital networks have been widely used in power systems, and the current differential protection of both ends of the line has been maturely applied to power grids of various voltage levels, especially the transmission and distribution lines in urban power grids and factory power supply systems. The line length may be very short, so that other protections (such as distance, overcurr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/26G01R31/08
CPCY02E60/728Y04S10/265Y02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 赵双石常宝波张进王振华
Owner DONGFANG ELECTRONICS
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