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Distance protection method for wind power generation transmission line

A technology for distance protection and transmission lines, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as failure characteristics of transmission lines that are not applicable to wind power transmission systems, avoid system power frequency deviation, and solve voltage variation dead zones Effect

Inactive Publication Date: 2014-12-24
STATE GRID CORP OF CHINA +2
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The present invention provides a distance protection method for wind power transmission transmission lines to solve the problem that the traditional transmission line distance protection method is not applicable to the fault characteristics of transmission lines in wind power transmission systems

Method used

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  • Distance protection method for wind power generation transmission line
  • Distance protection method for wind power generation transmission line
  • Distance protection method for wind power generation transmission line

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Embodiment Construction

[0026] The transmission line distance protection method adopted in the present invention is exactly the same as the application carrier of the traditional transmission line distance protection, that is, the software and hardware platform of the protection device. The following will refer to the accompanying drawings and describe in detail the distance of the wind power generation transmission line provided by the present invention through the implementation mode. Protection method:

[0027] 1. Discriminate the occurrence of faults: real-time collection of voltage and current instantaneous values ​​at the protection installation, and the fault start module uses the current variation to identify faults. The identification formula is as follows:

[0028] |i k -i k-2T |>1.2|i k-2T -i k-4T |+I QDsetting

[0029] In the above formula, i k is the current sampling value of the current sampling point, T is the sampling period, i k-nT is the current sampling value before n power ...

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Abstract

The invention relates to a distance protection method for a wind power generation transmission line. According to the method, firstly, whether a fault happens is judged; when the fault occurs, fault phase selection is carried out; according to the result of fault phase selection, a fault direction and a fault distance are measured; according to a fault distance calculation result and a fault direction judgment result, distance protection logic judgment is carried out in 20 ms after the fault occurs, and accordingly whether protection actions are carried out is judged. The distance protection method can solve the problem of frequency deviation when a wind power system breaks down and can control influences of system actions on transmission line distance protection.

Description

technical field [0001] The invention relates to a distance protection method for wind power generation sending and transmission lines, and belongs to the technical field of relay protection of electric power systems. Background technique [0002] With the advancement of smart grid construction, the application of various new energy sources is also increasing, and the access of new energy sources to the grid has also brought new problems. As a green energy, wind power has developed rapidly, and many large-scale wind power bases have been established in China. In the future, wind power will be more widely used as the main new energy. [0003] There is a big difference between the wind power generation system and the traditional power system in the electrical transient characteristics. First of all, the low-voltage ride-through ability of wind power generation is weak. When the voltage drops, the crowbar action of the generator set control system reduces the output of the fan,...

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Application Information

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IPC IPC(8): H02H7/26
Inventor 倪传坤杨勇裘愉涛潘武略李宝伟
Owner STATE GRID CORP OF CHINA