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Circuit cluster-based method for analyzing grid cascading failure based on

A line clustering and cascading failure technology, which is applied to electrical components, circuit devices, AC network circuits, etc., can solve the problem of not paying attention to the physical details of cascading failures

Inactive Publication Date: 2011-10-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, these models also have obvious shortcomings: these models do not actually pay attention to the physical details of the cascading failure development process, but emphasize the initial conditions of the cascading failure of the power grid and the long-term macroscopic overall characteristics of the cascading failure of the power grid, which is a qualitative cascading failure. Failure Mechanism Analysis Method

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  • Circuit cluster-based method for analyzing grid cascading failure based on
  • Circuit cluster-based method for analyzing grid cascading failure based on
  • Circuit cluster-based method for analyzing grid cascading failure based on

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Embodiment 1

[0032] figure 1 It is a flow chart of the grid cascading failure analysis method based on line clusters. figure 1 Among them, the method provided by the invention comprises:

[0033] Step 1: Establish a Bayesian network model cascading fault tree of the power grid.

[0034] In the present invention, the termination condition of the chain reaction is that the load is cut off, the generator is separated from the system, and the grid is disconnected, so that the Bayesian network model cascading fault tree that can be established is as follows: figure 2 shown.

[0035] The application of this fault tree method can clearly show the development process of cascading faults. When a line component is cut off, the probability of overloading of the line closely related to the line and the misoperation of the protection device will be greatly increased, resulting in a self-critical state of the line cluster. The most important form of cascading failure development process.

[0036] S...

Embodiment 2

[0070] The cascading fault simulation experiment is carried out on the IEEE 39 node system, the system nodes and electrical wiring are as follows: Figure 4 shown. This method can intuitively reflect the step-by-step change of the risk value of the power system in the chain reaction process by using the IEEE 39 node system for calculation and analysis. The 39-node system selects the generator full power and full power operation mode, and the five lines with the largest initial power flow are shown in Table 1:

[0071] Table 1 The five lines with the largest power flow in the 39-node system

[0072]

[0073] Assuming that the initial power flow of the system remains unchanged, taking the accidents of cutting off transmission lines L16 and L1 as an example, the power flow transfer caused by line faults is calculated by analyzing the distribution of line clusters in the 39-node system. According to the termination condition of cascading failures, the probability p of causing...

Embodiment 3

[0079] The cascading failure calculation example of a certain area of ​​Gansu power grid in my country is shown below, and the operation mode and weak link of the cascading failure of the regional power grid in this province are obtained. As an embodiment of the present invention, the content of the present invention is further described.

[0080] Taking Gansu's heavy load operation mode in the winter of 2009 as an example, some backbone grids and inter-provincial tie lines of Gansu power grid are as follows: Image 6 Shown:

[0081] Gansu and Shaanxi power grids adopt the limit mode of power transmission from east to west. First, the comprehensive program PSASP is used to scan the faults of Gansu power grid to determine the most dangerous faults in Pingliang-Qianxian lines, and set them as first-level faults for subsequent fault analysis. .

[0082] According to the analysis of the line cluster probability model, the possible secondary faults and corresponding index calculat...

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Abstract

The invention discloses a circuit cluster-based method for analyzing a grid cascading failure, belonging to the technical field of safety protection of a power system. The method comprises the following steps of: applying a Bayes network failure tree theory to cascading failure analysis based on a distribution failure probability model of a self-critical circuit cluster and establishing a probability analysis model for a grid cascading failure based on cascading failure probability analysis of the self-critical circuit cluster in combination with the probability characteristic of a cascading failure developing stage; and through simulating a cascading failure process, performing risk assessment on the cascading failure by using a system load loss index and analyzing weak links of a system. By adopting the method, foundations are provided for a prevention strategy for further research on the reduction of cascading failure risk.

Description

technical field [0001] The invention belongs to the technical field of power system safety protection, and in particular relates to a method for analyzing cascading failures of a power grid based on line clusters. Background technique [0002] In recent years, many major power outages at home and abroad are manifested as cascading failures. The common feature of such power outages is that a certain component is often disturbed at the beginning, causing damage to the normal operation of the component. As time goes by, the chain of accidents expands, affecting other components and even the entire system, causing other components to be disconnected one after another, and finally causing large-scale power outages. Although the probability of such accidents is not high, they are extremely harmful. With the continuous deepening of the understanding of cascading failures at home and abroad, how to build a reasonable grid cascading failure model has become the focus of many experts ...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02H7/26
Inventor 刘文颖王红印王佳明孙素琴杨楠孙建华金娜张建立于会泉姚峰梁才梁纪锋杨斌但扬清杜波李扬
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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