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Longitudinal differential protection method based on synchronous sampling point vector compensation principle

A technology of longitudinal differential protection and synchronous sampling, which is applied in the field of power system and can solve problems such as affecting performance, high channel requirements, and relying on GPS clocks

Active Publication Date: 2010-02-17
NARI TECH CO LTD +1
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Problems solved by technology

[0002] Traditional longitudinal differential protection is mainly realized based on the principle of synchronous sampling, such as sampling point adjustment method, vector rotation method, difference method, etc. Since data sampling in the digital station is not controlled by the protection device, it cannot be directly used in digital protection
To this end, Liu Hongjun, Sun Yimin, Li Yanxin. Performance Analysis of Optical Fiber Differential Protection in Digital Substation. Electric Power System Automation, 2008, 32(17): 72-74. LIU hongjun, SUN yimin, LI yanxin. A Performance Analysis of Line Differential Protection in Digitized Substation.Automation of Electric Power Systems, 2008, 32(17): 72-74. A clock signal synchronization scheme based on the ping-pong principle is proposed, but it has high requirements on the channel. When the channel delay fluctuates greatly, it will affect the protection performance
Zhao Shanglin, Hu Minqiang, Dou Xiaobo, Du Yansen. Research on Clock Synchronization Technology of Digital Substation Based on IEEE 1588. Power Grid Technology, 2008, 32(21): 97-102. ZHAO shanglin, HU minqiang, DOU xiaobo, DU dansen. Research of Time Synchronization in Digital Substation Based on IEEE 1588, Power System Technology, 2008, 32(21): 97-102. The digital substation clock synchronization technology based on GPS clock and IEEE1588 protocol has certain reference significance for realizing the synchronization of sampling data between stations, but It is highly dependent on GPS clock and high-precision clock source, which is not conducive to the safe and reliable operation of the power grid

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  • Longitudinal differential protection method based on synchronous sampling point vector compensation principle
  • Longitudinal differential protection method based on synchronous sampling point vector compensation principle
  • Longitudinal differential protection method based on synchronous sampling point vector compensation principle

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Embodiment Construction

[0034] The concrete implementation process of a kind of embodiment of the present invention is as follows:

[0035] 1) After the device is powered on, after the protection calculation buffer is filled with sampling data, the protection logic function operation is opened. Set the initial value of the compensation coefficient to an invalid state;

[0036] 2) Monitor the communication status of the longitudinal channel, if the channel is found to be abnormal (high bit error rate or channel delay is greater than 15ms), block the longitudinal differential protection, otherwise use the ping-pong method to measure the channel delay, and open the longitudinal protection;

[0037] 3) When the protection algorithm at both ends of the line adopts the protection algorithm with equal sampling intervals, the synchronization points on both sides can be fixed at the same number of sampling points; when the protection at both ends of the line adopts the protection algorithm with equal sampling...

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Abstract

The invention discloses a longitudinal differential protection method based on the synchronous sampling point vector compensation principle, which is characterized by comprising the following steps: calculating the current compensation coefficient * of the current side in real time and calculating the differential current and the braking current of the current side according to the following formulas when the synchronous calculation condition is met under the condition that the normal communication channel is normal: Id is equal to the absolute value of the difference of *1 and **2, and Ir isequal to the absolute value of the sum of *1 and **2, and carrying out the differential calculation with the traditional differential protection calculation method. The longitudinal differential protection method based on the synchronous sampling point vector compensation principle overcome the defect that the dependence of the longitudinal protection in a digital station on a GPS clock, a high-precision clock or a high-performance communication channel and ensures the safe and reliable running of the longitudinal protection.

Description

technical field [0001] The invention relates to a longitudinal differential data synchronization method and a corresponding longitudinal differential protection method, which are suitable for digital substation longitudinal differential protection and belong to the technical field of power systems. Background technique [0002] Traditional longitudinal differential protection is mainly realized based on the principle of synchronous sampling, such as sampling point adjustment method, vector rotation method, difference method, etc. Since the data sampling in the digital station is not controlled by the protection device, it cannot be directly used in digital protection. To this end, Liu Hongjun, Sun Yimin, Li Yanxin. Performance Analysis of Optical Fiber Differential Protection in Digital Substation. Electric Power System Automation, 2008, 32(17): 72-74. LIU hongjun, SUN yimin, LI yanxin. A Performance Analysis of Line Differential Protection in Digitized Substation.Automation...

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Application Information

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IPC IPC(8): H02H3/26
Inventor 蒋雷海陈建玉俞拙非吴崇昊
Owner NARI TECH CO LTD
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