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Transmission line fast distance protection method and device with upfc

一种距离保护、输电线路的技术，应用在紧急保护电路装置、电气元件等方向，能够解决UPFC线路误动等问题，达到保证可靠性、保证速动性的效果

Active Publication Date: 2021-01-01
XUJI GRP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for fast distance protection of transmission lines containing UPFC, which are used to solve the problems of malfunction and overrunning when the distance protection of the prior art is used for UPFC lines

Method used

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  • Transmission line fast distance protection method and device with upfc
  • Transmission line fast distance protection method and device with upfc

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] method embodiment

[0032] The fast-distance protection method for a power transmission line containing UPFC in the method embodiment of the present invention is used in the protection of an AC transmission line connected to a UPFC system. Transmission lines with UPFC systems such as figure 1 As shown, the fast distance protection workflow is as follows figure 2 As shown, the method includes the following steps:

[0033] (1) The line protection devices on both sides independently collect the voltage and current of each side;

[0034] The method of collecting voltage and current on both sides is as follows: for the voltage near the UPFC side, the line side PT is used for the voltage measurement, and the current measurement is for the line CT; for the far UPFC side, the voltage measurement can be taken as the line side PT or the bus side PT, and the ...

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Abstract

The invention relates to a fast distance protection method and device for transmission line containing UPFC, By calculating the maximum equivalent impedance of the UPFC during normal operation, When the system fails, the maximum equivalent impedance of UPFC calculated in normal operation is used to calculate the fault compensation voltage, which can effectively prevent the risk of maloperation ofthe fast distance protection when the protection device is used near the UPFC side and when the reverse outlet fails. At that same time, when the protection device is use on the far UPFC side and a metallic failure occurs outside the positive direction region, the risk of the fast distance protection bee overstepped is prevented.

Description

[0001] This application is a divisional application of the following application, the filing date of the original application: May 11, 2016, the application number of the original application: 201610309848.1, the invention name of the original application: transmission line fast distance protection method and device including UPFC. technical field [0002] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a method and a device for fast distance protection of transmission lines containing UPFC. Background technique [0003] The unified power flow controller (UPFC) can quickly and flexibly control the power flow of the line, improve the power flow distribution characteristics of the power grid, and maximize the transmission capacity of the power grid; it also has the ability to damp system oscillation and improve the stability of the power grid; Scale load shedding; optimize power flow distribution, reduce circu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 李宝伟姚武樊占峰倪传坤邓茂军李旭李保恩吴金龙席颖颖姜自强郝慧贞姚东晓李文正陈继瑞
Owner XUJI GRP
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