HVDC transmission line distance protecting method

A transmission line and distance protection technology, applied in emergency protection circuit devices, electrical components and other directions, can solve the problems of low reliability, DC transmission system outage, and the reliability of DC line protection needs to be improved, and achieves reliability and sensitivity. high sex effect

Inactive Publication Date: 2008-07-30
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the traveling wave protection currently in operation at home and abroad generally has the problem of low reliability and is prone to misoperation. According to the analysis of statistical data, the current transmission line failure is still the main reason for the outage of the DC transmission system. The protection of DC lines Reliability needs to be improved

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  • HVDC transmission line distance protecting method
  • HVDC transmission line distance protecting method
  • HVDC transmission line distance protecting method

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Embodiment Construction

[0016] The traditional distance protection for AC lines is based on the lumped parameter model, which is only suitable for shorter lines, and it is easy to judge wrongly when protecting the end. Since the distance protection actually only needs to judge whether there is a fault within the protection range, and does not require accurate distance measurement, a certain error can be tolerated, and the allowable error is the largest at the protection installation, while at the end of the protection range, it is necessary to accurately judge the fault Location.

[0017] In the distance protection method for HVDC transmission lines of the present invention, firstly, the Beryllon model is used to calculate the voltage and current at the end of the protection range, and then the line is simplified into a lumped parameter RL model, and then the fault point is calculated by using the calculated voltage and current at the end Distance, the calculation result only needs to distinguish whe...

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Abstract

The invention provides a distance protection method of high-voltage DC transmission circuit. The method is constituted on the basis of a time domain distribution parameter model and comprises following steps: firstly, calculating the voltage and the current at the tail end of a protection range by the distribution parameter model of a power transmission circuit according to the voltage and the current of a protection arrangement position; secondly, calculating the fault distance by a lumped parameter RL model of the transmission circuit according to the voltage and the current of the tail end of the protection range, and determining whether the fault is in or out of a protection region according to the symbol of the fault distance. The calculation of the protection method is carried out in time domain and requires a short data window and a great amount of calculation based on RL model. The method has the advantages of simple calculation and low sampling rate, thus rapidly monitoring the fault.

Description

technical field [0001] The invention relates to a method for protecting a power system line, in particular to a method for protecting the distance of a high-voltage direct current transmission line. Background technique [0002] In view of the superiority of high-voltage direct current transmission in long-distance large-capacity power transmission and system interconnection, high-voltage direct current transmission has developed rapidly all over the world in recent years, and its total capacity has reached about 50GW so far. At present, there are Tianguang DC, Guiguang DC and Sanhe DC systems located in Guangdong in China Southern Power Grid, and several large hydropower stations to be built will also use DC transmission technology. Among them, DC UHV will develop together with AC UHV and become an important part of the network framework. Therefore, improving the safety and reliability of DC transmission line operation has become an urgent problem to be solved. [0003] At...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 宋国兵索南加乐周德生张健康粟小华
Owner XI AN JIAOTONG UNIV
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