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A method to correctly select and cut generators and loads after disconnection of regional power grid

A technology for regional power grids and generators, which is applied in power network operating system integration, AC network voltage adjustment, and single-network parallel feeding arrangements, etc.

Active Publication Date: 2015-09-16
NARI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Commonly used identification methods can use the position signals of circuit breakers and knife switches to identify the parts where the generators and loads are located, but since there may be many locations similar to site X in similar power grids, it is difficult to have such conditions on site

Method used

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  • A method to correctly select and cut generators and loads after disconnection of regional power grid
  • A method to correctly select and cut generators and loads after disconnection of regional power grid
  • A method to correctly select and cut generators and loads after disconnection of regional power grid

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Embodiment Construction

[0025] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0026] The method used in the present invention is as image 3 As shown, namely:

[0027] Step 1, measure and calculate the frequency values ​​of the generator and the load, that is, measure or calculate all the frequency values ​​of the generator and the load.

[0028] Step 2, compare the deviations between the generator and load frequency values ​​and 50Hz one by one, that is, calculate the difference between the generator or load frequency f and 50Hz at site X one by one, when f-50>0 and f-50≥Δf 1s , it is considered that the generator or load is in a disconnected power grid with more generators than loads; correspondingly, when f-502s When , it is considered that the generator or load is in the disconnected grid where the generator is less than the load.

[0029] For the regional power grid, if there are still some power grids still connected...

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Abstract

The invention discloses a method for solving accurate selecting and changing of a generator and a load after regional power grid splitting, and belongs to the technical field of power system and automation. According to the method provided by the invention, the generator and the load can be recognized according to the frequency of the generator and the load, so as to accurately recognize the parts where the generator and the load are located. By adopting the method provided by the invention, the effect of accurate selecting of the need cutting generator and the load is realized, effective control measure of a security emergency control device is guaranteed powerfully, and the power distribution reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof. More precisely, the invention relates to a method for correctly selecting and cutting generators and loads after disconnection of regional grid faults. Background technique [0002] The grid structure of power grids in some areas or self-provided power grids of large factories and mines is designed or in some cases will appear as follows figure 1 The situation shown is that a certain site X (substation or power plant) in the grid is connected to other parts of the grid. [0003] After this type of power grid suffers from certain fault disturbances, the separate operation of the bus bars of station X may cause station X to be split into two parts. Correspondingly, the original power grid is also split into two independent parts. Distinguished from Grid Part B, see figure 2 . Since the power grid is divided into two parts, the generators and loads in each p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/14H02J3/38
CPCY04S20/222Y02B70/3225
Inventor 李雪明宣筱青颜云松刘天翼田苑刘旋
Owner NARI TECH CO LTD
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