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A Synchronization Method for Sampling AC Electric Quantities of Double-Circuit Lines Parallel on the Same Rod

A dual-circuit line, sampling synchronization technology, applied in electrical components, circuit devices, emergency protection circuit devices, etc., can solve the problems of complex processing process, poor practicability, large amount of calculation, etc., and achieve the effect of simple principle and strong practicability

Active Publication Date: 2016-04-20
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first type of method has poor practicability due to the complex processing process, large amount of calculation and long time-consuming data processing.
The second type of method ignores the impact of uneven sampling time intervals on measurement results, resulting in errors in sampling synchronization

Method used

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  • A Synchronization Method for Sampling AC Electric Quantities of Double-Circuit Lines Parallel on the Same Rod

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Embodiment Construction

[0015] The technical solution of the present invention will be further described in detail according to the accompanying drawings.

[0016] figure 1 It is a schematic diagram of a double-circuit line power transmission system on the same pole parallel to the application of the present invention. The protection devices in this embodiment are respectively installed in the m-terminal substation and the n-terminal substation of the parallel double-circuit line on the same pole. The protection device of the m-terminal substation collects the AC electrical quantity of the m-terminal of the parallel double-circuit line on the same pole. The n-terminal substation protection device collects the AC electrical quantity at the n-terminal of the parallel double-circuit line on the same pole, and transmits the AC electrical quantity at the n-terminal of the parallel double-circuit line on the same pole to the m-terminal substation protection device through optical fiber communication; wher...

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Abstract

The invention discloses a method for same-tower double-lines AC (Alternating Current) electrical capacity sampling synchronization. The method comprises the following steps: measuring same-tower double-lines end m fault phase reverse positive sequence current ImPhiFl and end n fault phase reverse positive sequence current InPhiFl; calculating angle Theta of ImPhiFl ahead of InPhiFl; and selecting the same-tower double-lines end n AC electrical capacity which is transmitted to end m transformer station protection device at t+(Theta / 2*Pi)*N*Delta t sampling moment, as well as the same-tower double-lines end m AC electrical capacity collected by the end m transformer station protection device at t sampling moment, as the synchronization data for relay protection operation, wherein Phi=phases A, B, and C of I line and phases A, B, and C of II, N denotes the sampling number in a fundamental frequency cycle, Delta t denotes sampling interval, t denotes sampling time. According to the invention, the same-tower double-lines double-ends AC electrical capacity sampling synchronization becomes zero; the calculation principle is simple, which adds little calculation to computer processing; cannot affect the relay protection movement speed of the same-tower double-lines; and the practicability is strong.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a method for sampling and synchronizing AC electrical quantities of double-circuit lines paralleled on the same pole. Background technique [0002] Due to the randomness and dispersion of the CPU's response time to the interrupt proposed by the hardware synchronization link, there is an error in the sampling synchronization accuracy, which is an inherent defect of the hardware synchronization sampling method. The AC sampling synchronization methods used in relay protection are mainly divided into two categories. One is to reduce the measurement error by processing the sampling data or correcting the measurement results when the synchronization error is constant; the second is to reduce the measurement error by Reducing the synchronization error reduces the measurement error. The first type of method has poor practicability due to the complex proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/00H02J13/00
CPCY02E60/00Y04S10/16Y04S10/20
Inventor 林富洪
Owner STATE GRID CORP OF CHINA
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