Optical fiber longitudinal differential protecting equipment based on multiple terminals self-adapting sample-taking synchronization process

A technology of optical fiber longitudinal differential protection and adaptive sampling, which is applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, circuit devices, etc., and can solve the problems of difficult precise synchronization, unsuitable promotion of projects, differential protection and other protection functions It is difficult to integrate the same device to achieve the effect of ensuring synchronization of sampling and effective and complete protection

Active Publication Date: 2010-05-19
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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  • Description
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Problems solved by technology

[0003] Synchronization method based on data channel, differential protection and other protection functions are difficult to integrate into the same device
[0004] Based on the reference phasor synchronization method, the line model and phasor accuracy are not easy to estimate, and it is difficult to synchronize accurately
[0005] The GPS-based synchronization method needs to install a special GPS receiver, and the project is not suitable for promotion

Method used

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  • Optical fiber longitudinal differential protecting equipment based on multiple terminals self-adapting sample-taking synchronization process
  • Optical fiber longitudinal differential protecting equipment based on multiple terminals self-adapting sample-taking synchronization process
  • Optical fiber longitudinal differential protecting equipment based on multiple terminals self-adapting sample-taking synchronization process

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing, the present invention is described in detail as follows:

[0019] The design of the present invention includes algorithm design, software design and hardware design.

[0020] 1. Algorithm design:

[0021] The core algorithm of this device is a multi-terminal adaptive sampling synchronization algorithm.

[0022] (1) First, calculate the communication time of the channel through the ping-pong synchronization algorithm based on the data channel;

[0023] (2), and then calculate the sampling synchronization error of the opposite side and this side from the communication time of the channel;

[0024] (3) By transmitting 16-bit random numbers to the opposite side, and by comparing the size of the random numbers on this side and the opposite side, adaptively set the master-slave;

[0025] (4) The master-slave obtained by self-adaptation slowly adjusts the sampling frequency from the slave side, and adjusts the cycle wave by 15...

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Abstract

The invention relates to an optical fiber differential protection device based on a multi-terminal adaptive sampling synchronous method, comprising a main control module, an exchange module, a panel module as well as a power module. The panel module comprises a key-press, a LCD display and a signal light. The invention is characterized in that the main control module comprises a PowerPC processor,a CPU, an A / D converter, a DRAM memory, a FLASH memory and a filter; the exchange module comprises an electric signal converter. The adoption of the multi-terminal adaptive sampling synchronous algorithm is to confirm the sampling error and the adoptive is mainly to adjust the sampling frequency to reach the synchronous sampling. The sampling rate inside the same protection device of the invention basically remains stable and ensures the synchronous sampling; meanwhile, the same set of data acquisition system can provide the differential protection function, and provides the differential protection, etc. other functions as well, thus realizing effective comprehensive protection (including not only the differential protection, but also other protective functions).

Description

technical field [0001] The invention relates to the technical field of power system protection automation, in particular to an optical fiber differential protection device based on a multi-terminal adaptive sampling synchronization method. Background technique [0002] Compared with traditional current protection or distance protection, transmission line current differential protection compares the currents on both sides of the line, and has the advantages of eliminating the influence of load current, not responding to system oscillation, good selectivity and high sensitivity. Compared with other data channels, Fiber Channel has the advantages of strong anti-electromagnetic interference, low bit error rate, and stable operation. Therefore, with the maturity of fiber channel technology, optical fiber differential protection has been widely used in power grid transmission lines. But the existing sampling technology can't keep the synchronization of sampling very well. Based ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/46H02H3/26G01R19/25
Inventor 尹秋帆张云魏建功
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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