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Method for forming islands of distribution system containing distributed power supply

A technology of distributed power supply and power distribution system, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of heavy network loss and large island scale, and achieve the effect of low computational time complexity

Inactive Publication Date: 2012-08-08
TIANJIN UNIV
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Problems solved by technology

However, this algorithm can only form an isolated island, which has a large scale and heavy network loss

Method used

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  • Method for forming islands of distribution system containing distributed power supply
  • Method for forming islands of distribution system containing distributed power supply
  • Method for forming islands of distribution system containing distributed power supply

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Embodiment Construction

[0027] The optimal island division strategy can maximize the advantages of distributed power, so that important loads can be restored to power during failures, and at the same time maximize the total load to restore power. However, as the scale of the system increases, the solution to the optimal island division problem faces the "curse of dimensionality" problem, and it will become very difficult to obtain the optimal island. Therefore, the purpose of the present invention is to find a practical approximation algorithm to quickly determine the optimal islanding scheme.

[0028] The present invention adopts a two-stage strategy to deal with the island division problem involving distributed power generation: first, the initial island division scheme is obtained by using the island establishment and island merging process including multiple tree knapsack problems (Tree Knapsack Problem, TKP); analysis and adjustment to obtain the final island solution. The present invention ado...

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Abstract

The invention relates to an intelligent distribution network and new energy. The invention provides a method for forming islands of a distribution system containing distributed power supply in order to overcome the defects in the prior art. The invention adopts the following technical scheme: firstly adopting the building and merging processes of the islands containing a plurality of tree knapsack problems (TKP) to obtain the initial island division scheme; and then correspondingly analyzing and adjusting the initial islands to obtain the final island scheme, wherein obtaining the initial island division scheme refers to solving TKP by the branch and bound algorithm, which comprises the following processes: firstly solving the critical item of TKP and then finding out the upper bound of TKP in the polynomial time, namely computed time complexity O(n2), by adopting lagrangian relaxation, wherein n is the total number of nodes. The method is mainly applied to rapidly solving the problemof division of the optimal islands of the distribution system containing distributed generation.

Description

technical field [0001] The invention relates to an intelligent distribution network and new energy sources, in particular to a method for forming an isolated island of a power distribution system including distributed power sources. Background technique [0002] The introduction of distributed generation (Distributed Generation, DG) has brought a significant impact on the operation of the distribution network and the reliability of power supply for users. After the distributed generation is connected to the grid, in the event of failure or emergency, measures to disintegrate the system can be taken to perform island operation, thereby reducing the scope and time of power failure and improving the reliability of power supply of the system. Distributed generation technology is in the ascendant, and it has become a research hotspot for relevant scholars to find a practical new technology to quickly solve the problem of optimal island division in distributed generation and distr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06F19/00H02H7/26
Inventor 林济铿王旭东李胜文
Owner TIANJIN UNIV
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