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Online risk evaluation method for power distribution network

A technology for risk assessment and distribution network, which is applied in the direction of instruments, data processing applications, calculations, etc., can solve the problems of not considering the impact of distribution network, not fully considering the importance, etc., and achieve the effect of reducing risks

Inactive Publication Date: 2014-08-13
HUNAN UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 2. Previous risk assessments often involved probability and operating experience, such as failure rates, etc., based on historical data or operating data for risk assessment of distribution networks, without considering distribution network The impact of the risk of components in the grid including distribution transformers, feeder sections, feeders and feeder contact groups on the risk of the distribution network;
[0010] 3. Failure to fully consider importance

Method used

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  • Online risk evaluation method for power distribution network
  • Online risk evaluation method for power distribution network
  • Online risk evaluation method for power distribution network

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Such as figure 1 Shown is a flow chart of the distribution network online risk assessment method of the present invention. The first step is to divide the risk into four layers, namely the equipment layer (distribution transformer, feeder section), feeder layer, and feeder contact group layer (feeder contact group: feeders that are physically connected and can be electrically transferred to each other are A feeder liaison group), system layer, collect data of risk indicators and important indicators of each layer, including real-time data (distribution transformer primary side voltage, distribution transformer load rate, distribution transformer load, feeder segment load rate, feeder segment Zero-sequence current, cable tap temperature, feeder zero-sequence current), ledger data (distribution transformer service life, distribution transformer rated capacity, feeder segment service life, feeder length), historical data (distribution transformer defect times, feeder sect...

Embodiment 2

[0105] Taking the distribution transformer as an example, the calculation process of its risk value R and importance value Imp is as follows:

[0106] For example, the data of a distribution transformer is as follows: the primary side voltage is 1.1, the load rate is 80%, the service life is 12 years, the orange warning of thunderstorms and strong winds, 3 general defects, the rated capacity is 800kW, and there is 1 secondary user in the connection. During the guaranteed power supply period, the distribution transformer is located in the central urban area of ​​the B-type area.

[0107] According to the cross-sectional data, the calculation indicators are as follows: Risk indicators: λ Tu =2,λ TL =2,λ TY =2, λ TT =4,λ TB =2; Importance index: λ TS =3,λ TIL =2,λ TIU =2,λ TS =3,λ TA =4.

[0108] The risk value R and the importance value Imp are determined by the weight of the index and the index comprehensively, specifically: the square and the square root of the produ...

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Abstract

The invention relates to an online risk evaluation method for a power distribution network, and belongs to the field of electric power system risk evaluation. Risks are divided into a device layer, a feeder layer, a feeder contact group layer and a system layer through the online risk evaluation method. The method comprises the steps of firstly, respectively collecting data of risk indexes and importance indexes of each layer, and storing the data into a real-time database; then, judging numerical values of the risk indexes and numerical values of the importance indexes of each layer by the combination of judgment criteria defined by a rule base, wherein the risk indexes and the importance indexes are divided into five levels in the rule base; finally, respectively calculating the risk value R and the importance value Imp of each layer. According to the online risk evaluation method, the risks of the power distribution network are divided into the four layers and five levels, so that the influence of the risks of components in the power distribution network on the risks of the power distribution network is considered, the system risks can be known, the device risks can also be known, importance of each component in the power distribution network is provided, and clearer guidance is provided for reducing the risks.

Description

technical field [0001] The invention relates to the field of power system risk assessment, in particular to an online risk assessment method for a distribution network. [0002] Background technique [0003] In the research field of power system risk assessment, the existing technologies mainly involve the risk assessment of the transmission network or the risk assessment of key equipment (such as short circuit breakers, wall bushings), and seldom involve the risk assessment of the distribution network. [0004] However, as the economy continues to grow, the society's demand for electricity is at a critical turning point. In the future, the scale of the distribution network will become increasingly large and the structure will become increasingly complex. While the rapid development of the distribution network has achieved great benefits, it will also had to bear greater potential risks. Especially with the access of distributed power in the power distribution system, the ...

Claims

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Application Information

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IPC IPC(8): G06Q50/06
Inventor 曹小明付英杰
Owner HUNAN UNIV
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