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Method and system for screening N-2 fault

A screening method and N-2 technology, applied in the field of power grid security risks, can solve problems such as low efficiency and large data calculation burden, and achieve the effect of reducing the amount of calculation and avoiding huge amount of calculation.

Active Publication Date: 2016-07-20
GUANGZHOU POWER SUPPLY CO LTD +1
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Problems solved by technology

[0004] Based on this, it is necessary to provide an N-2 fault screening method and system for the problems of excessive data calculation burden and low efficiency in the existing fault screening methods

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  • Method and system for screening N-2 fault
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  • Method and system for screening N-2 fault

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Embodiment Construction

[0022] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and do not limit the protection scope of the present invention.

[0023] See figure 1 Shown is an embodiment of the N-2 fault screening method of the present invention. The N-2 failure screening method in this embodiment includes the following steps:

[0024] Step S101: Obtain the active power limit value of the target branch in the power grid;

[0025] Step S102: Obtain the change in active power of the target branch before and after each remaining branch in the power grid is disconnected and the active power value of the target branch before each remaining branch is disconnected;

[0026] Step S103: According to the active power limit...

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Abstract

The invention relates to a method and a system for screening an N-2 fault. An active power limit value for each branch in the power grid, active power variations before and after breaking of each remaining branch for a target branch and an active power value before breaking of each remaining branch for the target branch are acquired firstly; according to the above three values, an overload contribution rate for the target branch by breaking of each remaining branch is acquired respectively; the remaining branches are grouped according to the overload contribution rates, two branches whose overload contribution rate sum is no smaller than an overload contribution rate standard value are screened according to the grouped condition, and an N-2 fault is obtained. By adopting the scheme of the invention, each possible combination of two branches does not need to be screened, grouped screening is carried out according to the grouped condition, the huge amount of computation which is difficult to calculate caused by combination explosion can be avoided, and the computation amount for power grid risk analysis is greatly reduced.

Description

Technical field [0001] The invention relates to the field of power grid security risks, in particular to a screening method and system for N-2 faults. Background technique [0002] With the introduction of new energy and power markets, as well as the sharp increase in loads, the safe operation of the power grid is facing greater challenges. Since multiple faults have a greater impact on the safe operation of the power grid, relevant departments have formulated corresponding regulations and systems, requiring that when multiple faults with a high probability occur in the power grid, the normal operation of the power grid should be guaranteed, that is, no branch overload, Phenomena such as load shedding. However, despite the corresponding regulations, there are still many problems to be solved in technical realization. One of the more important issues is that in the analysis of multiple failures, the number of multiple expected failures caused by the combined explosion is huge, w...

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Application Information

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IPC IPC(8): G06Q50/06G06F17/16
CPCG06F17/16G06Q50/06
Inventor 莫文雄游大海栾乐陈国炎龙呈张峰王刚黄俊张哲雷超平李光茂许中肖天为
Owner GUANGZHOU POWER SUPPLY CO LTD
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