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Stability limitation monitoring method

A limited and stable technology, applied in the field of power grid, can solve the problems of increased monitoring workload, lack of operability, and inability to fully utilize the power supply capacity of the power grid, so as to reduce the difficulty of monitoring and reduce the monitoring workload.

Active Publication Date: 2015-03-25
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the monitoring method of this cross-section power flow lacks operability in the actual power grid operation, and the operation process needs to monitor various power flows, which increases the monitoring workload
Moreover, this method cannot make full use of the power supply capacity of the power grid.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] A stable quota monitoring method provided by the present invention comprises the following steps:

[0016] Step 1: Calculate the power flow transfer coefficient. The current power flow value of the first line is a, and the current power flow value of the second line is b. After the first line trips, the power flow value of the first line becomes 0, and at this time the second line The power flow value becomes b', and the power flow transfer coefficient r=(b'-b) / a from the first line to the second line can be obtained; it should be noted that the power flow transfer coefficient is related to the grid parameters. When the power flow changes, The transfer coefficient remains unchanged, and the power flow transfer coefficient can be obtained through the power grid simulation software.

[0017] Step 2: Calculate the power flow value of the second line after the first line trips, the instantaneous power flow value of the first line is A, the instantaneous power flow value of ...

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Abstract

The invention discloses a stable-limit monitoring method and relates to the field of power grid and solves a technical problem that in the prior technology, monitoring work load of a multi-level step digital combination limit method is large. In the limit monitoring method, according to a power-flow change of a second line after trip of a first line, a coefficient of power-flow transference of the first line to the second line is calculated and according to an instant power-flow value of the first line, an instant power-flow value of the second line and the coefficient of power-flow transference of the first line to the second line, the power-flow value of the second line after the trip of the first line is obtained and monitored so as to be smaller than a rated load power flow of the second line so that it can be ensured that after trip of any of the lines, overload does not happen in the other line. The stable-limit monitoring method is applicable to power-flow monitoring of power-grid fault faces.

Description

【Technical field】 [0001] The invention relates to the field of power grids, in particular to a quota monitoring method 【Background technique】 [0002] The existing power grid section quota method is given in discrete digital form. For sections composed of multiple lines, multi-step digital combination quotas are often used. When the power flow exceeds 500MW but does not reach 600MW, the power flow of line 2 needs to be controlled to be less than 400MW; when the power flow of line 1 exceeds 600MW but does not reach 700MW, the power flow of line 2 needs to be controlled to be less than 300MW. This prevents one circuit from overloading the other after tripping. However, the monitoring method of this cross-section power flow lacks operability in the actual power grid operation, and the operation process needs to monitor various power flows, which increases the monitoring workload. Moreover, the power supply capacity of the power grid cannot be fully utilized in this way. 【Co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J13/00
CPCY04S10/40
Inventor 王晓光王函韵吴鸣鸣钟亮杨逸
Owner STATE GRID CORP OF CHINA