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A Method for Determining Failure Sets Based on Security Domains for n-1 Check Failures

A technology for determining the method and fault set, applied in the direction of digital transmission system, electrical components, transmission system, etc., can solve the problem of difficult to guide the distribution network online, long calculation time, etc., to ensure rapidity, accuracy, The effect of accuracy and speed

Inactive Publication Date: 2018-07-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this method uses case by case to verify whether the current load of the distribution network meets the safe operation conditions, which often requires a long calculation time, and it is difficult to guide the operation of the distribution network online.

Method used

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  • A Method for Determining Failure Sets Based on Security Domains for n-1 Check Failures
  • A Method for Determining Failure Sets Based on Security Domains for n-1 Check Failures
  • A Method for Determining Failure Sets Based on Security Domains for n-1 Check Failures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A security domain-based N-1 check failed failure set determination method, see figure 1 , figure 2 and image 3 , the method includes the following steps:

[0032] 101: Obtain the safety boundary of each feeder or feeder segment load through the distribution network security domain;

[0033] 102: According to the characteristics of the load distribution in the safety boundary expression, any safety boundary is divided into a feeder fault type boundary and a main transformer fault type boundary, output a fault feeder or a fault main transformer, specify the fault type, and form an initial fault set;

[0034] 103: directly output the fault feeders in the initial fault concentration as components of the final fault concentration;

[0035] 104: Combining the faulty main transformer in the initial fault concentration and the backup main transformer of the faulty main transformer to judge through the safety distance, obtain the non-transferable load and stop-transfer load...

Embodiment 2

[0039] The scheme in Embodiment 1 will be described in detail below with specific calculation formulas and examples, see below for details: 201: Obtain the safety boundary of each feeder or feeder section load through the distribution network security domain

[0040] Among them, the distribution network security domain can be written as the following general formula:

[0041]

[0042] In formula (1), DSSR is the security domain; F 1 , F 2 ...F n Indicates the feeder or feeder section load (i.e., in the single-connection case, F n Indicates the single-connection feeder load; in the case of multiple connections, F n Indicates the feeder or feeder segment load that can be transferred to the line outside the station); F m Express with F n The feeder or feeder segment load with contact relationship; F j Express with F m Loads of other feeders or feeder sections connected to the same main transformer; F k Indicates a fault followed by an F n Other loads connected to the ...

Embodiment 3

[0074] Below in conjunction with concrete test, formula, the scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:

[0075] The grid structure of the example power grid is as follows: Figure 4 As shown, there are 2 substations, 4 main transformers, 20 outgoing feeders, and 22 feeders or feeder section loads. The numbers 1 to 22 represent F 1 ~F 22 , feeders are selected JKLYJ-185, the allowable capacity of 11.30MVA. See Table 1 for the main transformer data of the substation; see Table 2 for the load level data of the current distribution network.

[0076] Table 1 Basic information of the main transformer

[0077]

[0078] Table 2 Load Levels

[0079]

[0080] 1) Calculate the safety boundary and safety distance of the distribution network. The current safety domain of the distribution network is:

[0081] f 1 ≤min(RF 11 -F 11 , R 3 -F 11 -F 12 -F 13 -F 14 -F 15 -F 21 )

[0082] f 2 ≤min(RF 16 ...

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Abstract

The invention discloses an N-1 calibration no-pass fault set determining method based on a security domain, comprising the following steps: dividing any security boundary into a feeder fault type boundary and a main transformer fault type boundary, outputting a faulty feeder or a faulty main transformer, identifying the fault type, and forming an initial fault set; directly outputting the faulty feeder in the initial fault set and adding the faulty feeder to a final fault set; making judgment based on the safety distance according to the faulty main transformer in the initial fault set and a standby main transformer of the faulty main transformer, getting a non-transferable load and a transfer-stopped load, working out the sum, and getting the minimum load value of the main transformer after transfer; and adding the faulty main transformer and the standby main transformer of the faulty main transformer to the final fault set if the load value is greater than the capacity of the standby main transformer of the faulty main transformer. According to the method, the N-1 security boundary is calculated according to the network structure and parameters, without the need for simulation. According to actual power grid inspection, the calculation speed of the method is greatly increased compared with the N-1 simulation method, and the method has the advantages of accuracy and quickness.

Description

technical field [0001] The invention relates to the field of distribution network security domains, in particular to a method for determining a fault set for unsuccessful load transfer after using the distribution network security domain to screen a main transformer or feeder element N-1 fault. Through this method, the fault sets that fail the N-1 check of any given distribution network can be obtained. Background technique [0002] In the distribution network, safe and efficient operation has always been a concern [1] . The traditional distribution network security evaluation method is mainly the N-1 simulation method [2-4] , and has always been the most widely used distribution network security evaluation method. The N-1 verification of the power distribution system mainly includes two scenarios: main transformer N-1 fault and feeder N-1 fault. [0003] Among them, the feeder N-1 verification is to check whether the load of the feeder or feeder section can be transferr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/24
CPCH04L41/0677
Inventor 肖峻甄国栋李思岑
Owner TIANJIN UNIV