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A Method for Determining n-1 Overload Component Set Based on Safety Domain

A determination method and overload technology, applied in the direction of electrical components, AC network circuits, circuit devices, etc., can solve problems such as long calculation time, difficult distribution network, etc., and achieve the goal of ensuring accuracy, increasing calculation speed, and ensuring rapidity Effect

Active Publication Date: 2017-07-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method 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 n-1 Overload Component Set Based on Safety Domain
  • A Method for Determining n-1 Overload Component Set Based on Safety Domain
  • A Method for Determining n-1 Overload Component Set Based on Safety Domain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for determining the N-1 overload component set based on the safety domain, see figure 1 , figure 2 and image 3 , the method includes the following steps:

[0037] 101: Obtain the safety boundary of the feeder capacity constraint and the main transformer capacity constraint security boundary of each load through the security domain of the distribution network;

[0038] 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;

[0039] 103: directly output the fault feeders in the initial fault concentration as components of the final fault concentration;

[0040] 104: Combining the faulty main transformer in the initial fault concentration and the backup main transformer of the faulty main transformer to ju...

Embodiment 2

[0045] The scheme in embodiment 1 is described in detail below in conjunction with specific calculation formulas and examples, see below for details:

[0046] 201: Obtain the feeder capacity constraint security boundary of each load and the main transformer capacity constraint security boundary through the security domain of the distribution network;

[0047] Among them, the distribution network security domain can be written as the following general formula:

[0048]

[0049] 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 ...

Embodiment 3

[0088] 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:

[0089] 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.

[0090] Table 1 Basic information of the main transformer

[0091]

[0092] Table 2 Load Levels

[0093]

[0094] 1) Calculate the safety boundary and safety distance of the distribution network. The current safety domain of the distribution network is:

[0095] f 1 ≤min(RF 11 -F 11 , R 3 -F 11 -F 12 -F 13 -F 14 -F 15 -F 21 )

[0096] f 2 ≤min(RF 16 ...

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Abstract

The invention discloses a security domain-based method for determining an N-1 overload component set. The method comprises the following steps: dividing any security boundary into a feeder fault type of boundary and a main transformer fault type of boundary, outputting a faulty feeder or a faulty main transformer, and indicating the fault type to form an initial fault set; directly outputting the faulty feeder in the initial fault set as an element in a final fault set; carrying out a judgment by combining the faulty main transformer in the initial fault set and a standby main transformer of the faulty main transformer through a security distance, obtaining a non-transfer load and a transfer stopping load, and carrying out a summation to obtain a load value with the minimum main transformer after transferring; if the load value is greater than the standby main transformer capacity of the fault main transformer, adding the faulty main transformer and the standby main transformer of the faulty main transformer to the final fault set; and obtaining overload elements through the final fault set and the security distance and forming the overload elements into a set. An actual power grid inspection shows that compared with an N-1 simulation method, the calculation speed of the method is greatly improved; and the method has the advantages of accuracy and rapidity.

Description

technical field [0001] The invention relates to the field of distribution network security domain, in particular to a method for determining an overload component set after screening main transformer or feeder element N-1 faults by using the distribution network security domain. With this approach, the set of overloaded elements after N-1 faults for any given distribution network can be determined. 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 transferred to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 肖峻甄国栋郭伟
Owner TIANJIN UNIV