Power distribution network reliability rapid evaluation method in power system

A power system and reliability technology, which is applied in the field of rapid evaluation of distribution network reliability, can solve problems such as distribution network reliability that has not yet been developed, and achieve the effect of improving effectiveness and avoiding mathematical operations

Pending Publication Date: 2020-04-14
GUANGDONG POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current research on distribution network topology is still in its infancy, and no research on the application of topology similarity to evaluate distribution network reliability has been carried out.

Method used

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  • Power distribution network reliability rapid evaluation method in power system
  • Power distribution network reliability rapid evaluation method in power system
  • Power distribution network reliability rapid evaluation method in power system

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Embodiment 1

[0037] In order to solve the application difficulties of the traditional distribution network reliability index calculation method in the power system, a reliability calculation method based on distribution network topology similarity analysis is proposed. The realization of the method of the present invention is based on matrix topology It is obtained through analysis, and the data in the standard topology database can be updated at any time, so it can adapt to the continuous development of distribution network topology analysis technology, and has great practical guiding significance.

[0038] The present invention proposes a reliability calculation method based on distribution network topology similarity analysis, the method has the following steps:

[0039] Step 1: Development of a standard topology database

[0040] A well-developed database can improve calculation accuracy, and the standard database framework structure is as follows: figure 2 shown. For each determine...

Embodiment 2

[0053] The following examples have further illustrated the practical application advantages of the present invention:

[0054] In order to evaluate the computational speed of the proposed algorithm, this section performs three cases, eg, 5-node, 9-node and 26-node distribution networks. Other algorithms for comparison are: Monte Carlo method and Failure Mode Effects Analysis. For each case, each algorithm is repeatedly calculated 100×10 times, and the average value of the time consumed is recorded in Table 1 (unit: s / hundred times).

[0055] Table 1 The time used to calculate 100 times using different algorithms

[0056]

[0057] As shown in Table 1, the calculation speed of the algorithm is significantly faster than other algorithms, and the calculation amount will not increase significantly as the order of the matrix increases. Especially, for the Monte Carlo method, when the order of the matrix exceeds 50, the time required for the program to complete the operation exc...

Embodiment 3

[0059] This paper takes IEEE 33 node distribution network as an example to realize reliability analysis. The Average Service Availability Index (ASAI) is used as a reliability indicator, IEEE 33 node distribution network such as Figure 4 shown. According to the topology structure diagram of the 33-node distributed network, the database information of some 33 nodes is selected, its singular value sequence is extracted, and compared with the singular value sequence of the IEEE 33-node distributed network topology.

[0060] In order to screen similar singular value sequences, it is necessary to determine the threshold and the length of the singular value sequence. For comparison, thresholds were set at 0.01, 0.02 and 0.03, respectively. And the lengths of the singular value sequences are set to 20, 30 and 33, respectively. Then, the number of singular value sequences satisfying this condition is shown in Table 2.

[0061] Table 2 Number of singular value sequences under diff...

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Abstract

The invention provides a power distribution network reliability rapid evaluation method in power system. The method comprises the steps: building an adjacent matrix through the topology of the power distribution network through the mathematic relation between the topology of the power distribution network and the reliability of the power distribution network, and obtaining a singular value reflecting the features of the matrix; calculating two most similar topologies by using singular values between the topologies, and quickly calculating the reliability index of the target power distributionnetwork according to the reliability index of the known topology in the standard database. According to the method, a large number of complex mathematical operations are avoided, the standard databasecan be continuously perfected in the continuous development of the reliability analysis technology, and the effectiveness of the data used by the method is continuously improved so that certain guiding significance can be provided for the reliability analysis of the power distribution network in practice.

Description

technical field [0001] The invention relates to the field of rapid evaluation methods for distribution network reliability, and more particularly, to a rapid evaluation method for distribution network reliability in a power system. Background technique [0002] The distribution network is located at the end of the power system, supplying and distributing energy directly to power users. Distribution network reliability encompasses all electricity consumers, protection equipment and contingencies in distribution feeders. Therefore, distribution network reliability assessment is an important task in the power industry. Several methods have been developed in recent years to assess the reliability of distribution networks, which are divided into analytical and analogical methods. The former mainly includes state-space methods, network methods, and system state enumeration methods, which represent system properties in terms of system structure, component states, and logical rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/16G06Q10/06G06Q50/06
CPCG06F17/16G06Q10/06393G06Q50/06
Inventor 林秀钦刘昊曾庆辉刘少辉马榕嵘李雷涂琬婧吴焯军张思寒王云飞
Owner GUANGDONG POWER GRID CO LTD
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