Teed line pilot protection system and pilot protection method thereof

Abstract

The invention discloses a teed line pilot protection system and a pilot protection method thereof belonging to the field of fault identification of power systems. The teed line pilot protection system comprises a startup information upload module, a three-station information interaction module and a tee protection action module which are sequentially connected; the startup information upload module outputs results at intervals on the basis of an inter-station protection line and extracts distance protection and zero-sequence current protection startup information; the three-station information interaction module calculates and transmits inter-station interaction information on the basis of the startup information uploaded by the startup information upload module; and the tee protection action module identifies an inter-station teed line fault according to three-station interaction information and local protection startup information. The teed line pilot protection system can obtain an accurate judgment action when an internal fault of a teed line appears, and the protection performance is sensitive and reliable. By the teed line pilot protection system, acceleration of local backup protection action time is achieved, and meanwhile, the problem that the teed line is difficult to set is successfully solved.

Description

technical field [0001] The invention belongs to the technical field of power system fault identification, and in particular relates to a T-connection longitudinal protection system and a longitudinal protection method thereof. technical background [0002] Relying on the State Grid Corporation's 2015 headquarters science and technology project - key technology research on the station area-wide area integrated protection system based on the optimization of information architecture, the power grid in the Shendang area of ​​Jiaxing Power Supply Company was selected as the pilot grid. The pilot area mainly includes: 220kV The new substation, 110kV Shendang substation, 110kV Qijia substation and 110kV Henggang substation; Yuexin substation and Qijia substation are connected by double circuit; Qijia substation, Shendang substation and Henggang substation are connected by T connection. Dang substation and Henggang substation are connected by double-ended lines, and Qijia substation...

AI Technical Summary

Problems solved by technology

At present, the research work is mainly focused on the parameter measurement based on the double-terminal synchronization information of the line. For the line with T-connection, because the voltage and current of the T-connection cannot be directly measured, there is no effective algorithm for measurement

[0004] Due to the complex structure of the T-connection line, the traditional single-power radial power grid has become a multi-power system, and the current, current, and power have also changed from the original one-way flow to two-way flow, which makes protection setting difficult.

It also greatly reduces the protection range of the distance I section, and causes the distance II section on each side to be unable to take into account the selectivity and sensitivity of the protection on the other two sides

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