Grid fault positioning method based on wide area voltage

A wide-area voltage and power grid fault technology, applied in the field of power transmission and distribution, can solve problems such as data collection and processing difficulties, definition, and increase in system data volume

Active Publication Date: 2014-01-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although a lot of research has been done on fault location at home and abroad, due to the large space span of the wide area system itself, the complex topological structure and operation mode, the amount of data in the system has been greatly increased, which brings great challenges to data collection and processing. great difficulty
So far, there is no effective method to define the fault area and protect the system at the first time

Method used

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  • Grid fault positioning method based on wide area voltage
  • Grid fault positioning method based on wide area voltage
  • Grid fault positioning method based on wide area voltage

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Embodiment Construction

[0046] The present invention comprises the following steps:

[0047](1) Select effective fault voltage components.

[0048] The fault component is usually extracted by the half-cycle delay method:

[0049]

[0050] In the formula, is the fault component voltage, is the fault voltage, is the power frequency cycle.

[0051] The fault components of the three phases A, B, and C can be detected by using formula (1), and the fault components of the three sequences can be calculated by using the symmetrical component method:

[0052]

[0053] (2) According to the size of the fault voltage, the whole system is divided into the fault area, the area affected by the fault and the area basically not affected by the fault by using the fuzzy cluster analysis theory.

[0054] Fuzzy cluster analysis method:

[0055] Standardized transformation of the original fault voltage;

[0056] Use the fault component analysis measured or calculated by the PMU of each node to calc...

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Abstract

The invention relates to a grid fault positioning method based on wide area voltage. The method comprises the steps of firstly extracting fault voltage components of all nodes, then dividing the entire system into a fault area, areas influenced by the fault and areas basically uninfluenced by the fault according to the magnitude of the fault voltage, respectively taking different precaution and alarming measures to the areas according to the degrees of the influence of the fault, preliminarily defining a fault range, performing fault positioning to the fault area by adopting a fault analysis method based on the wide area voltage and finally recording and feeding back fault data for making a preparation for the fault positioning at the next time. The grid fault positioning method based on the wide area voltage has the advantages that the grid fault can be rapidly positioned by adopting the voltage data only and the problem of inconvenience in the processing due to the large data size of a wide area system is solved; the fault can be accurately positioned to a certain section of a line by using the method, favorable conditions are created for troubleshooting the grid fault in time and preventing overload and other problems from causing intertripping, and the accident of large-area power outage is effectively avoided.

Description

technical field [0001] The invention relates to a method capable of timely and accurately locating and removing grid faults and preventing chain trips caused by problems such as overload, and belongs to the technical field of power transmission and distribution. Background technique [0002] In the past 30 years, large power outages have occurred frequently due to improper protection coordination and chain reactions. To solve this problem, the backup protection system of the power grid must be perfected in terms of adaptability and intelligence. In order to alleviate the serious impact of blackouts, the wide-area backup protection system is required to quickly locate and isolate fault areas, reducing or avoiding chain reactions. [0003] Although a lot of research has been done on fault location at home and abroad, due to the large space span of the wide area system itself, the complex topological structure and operation mode, the amount of data in the system has been greatl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 徐岩应璐曼刘青
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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