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Extensible digitization sampling value quality processing method

A processing method and sampling value technology, which is applied in the field of railway intelligent substation automation system protection, can solve problems such as device misoperation, blocking, and data sampling synchronization, and achieve the effects of improving reliability, broad application prospects, and strong applicability

Active Publication Date: 2015-12-02
南京国电南自轨道交通工程有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The digital network transmission mode will bring data sampling synchronization and transmission delay problems. Data transmission delay may cause the protection to fail to receive data on time and block. If the data sampling is not synchronized seriously, it may lead to serious malfunction of the device. as a result of

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Embodiment Construction

[0017] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0018] 1. The ASDU structure of the IEC61850-9-2 sampling value message is attached figure 1 shown. The adopted value sequence value is 8 bytes in length, the first 4 bytes are sampling data, and the last 4 bytes are quality bits. This method will perform certain processing on the quality bits of the last 4 bytes so as to achieve the final goal.

[0019] 2. Definition of quality bit, validity refers to data validity. Validity can be good (good), invalid (invalid), questionable (suspicious). So...

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Abstract

The invention is suitable for application of distinguishing validity of sampling data in an automatic system of a railway intelligent substation. The extensible digitization sampling value quality processing method provided by the invention is characterized by comprising the following steps of: quickly identifying quality order, and performing sampling data quality identification on a received SV message according to sampling time interval of 80 points sampling; performing synchronization and interpolation calculation through a virtual sampling counter (smpCnt); and performing sorting treatment on network disconnection, AD sampling abnormity and synchronization abnormity. The method provided by the invention plays a role in reliable and effective supplement when a digitization system based on a global synchronization clock is invalid.

Description

technical field [0001] The invention relates to the protection field of railway intelligent substation automation system. The present invention provides a reliable solution to the failure of the global clock in the railway intelligent substation automation system, and can make the protection act correctly by judging the data quality bit. Background technique [0002] In the railway intelligent substation automation system, network transmission of SV sampling values ​​has become a development trend. The sampling value of the protection device is obtained from different intelligent terminal devices and the merging unit through the SV communication network in the station. When the sampling value is transmitted by networking, it is necessary to add time synchronization measures for the merging unit. In the intelligent substation automation system, the whole station is equipped with a set of global clock (the clock can be configured redundantly to enhance reliability), and all s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
Inventor 施林松王丹孙金华
Owner 南京国电南自轨道交通工程有限公司