Active distribution network fault recovery method with consideration of random variation of distributed power supply outputs

A technology of active distribution network and distributed power supply, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of high probability of wind turbines, limit the practicability of the scheme, and cannot reflect the output range of DG, and ensure the simulation accuracy. , the effect of reducing the amount of calculation and improving the calculation efficiency

Inactive Publication Date: 2019-01-01
ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +2
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Problems solved by technology

[0004] Some introduce interval numbers into distribution network fault recovery models to describe the fluctuation of DG output, but this interval number simulation can only simulate DG output in a certain interval, and cannot reflect the entire output range of DG
Some divide the fan output into three typical scenarios: under-rated output, zero output, and rated output. However, in reality, the probability of the fan being under-rated is relatively high, and the randomness of fan output cannot be well simulated.
Some consider DG island operation and main network reconfiguration for fault recovery at the same time, but most of the main network reconfiguration schemes are based on the power flow section at a certain moment, and the reconstruction results often meet a specific situation, which limits the practicability of the scheme

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  • Active distribution network fault recovery method with consideration of random variation of distributed power supply outputs
  • Active distribution network fault recovery method with consideration of random variation of distributed power supply outputs
  • Active distribution network fault recovery method with consideration of random variation of distributed power supply outputs

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Embodiment Construction

[0050] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0051] An active distribution network fault recovery method considering the random variation of distributed power output, such as Figure 1 to Figure 3 shown, including the following steps:

[0052] Step 1. Based on the alternate joint strategy of depth and breadth, the active distribution network is divided into islands;

[0053] Island partitioning is a combinatorial optimization problem with multiple constraints, that is, to obtain a partitioning scheme that maximizes the amount of power-off load recovery under a series of system stability constraints. The present invention proposes an alternate joint search strategy of depth and breadth to divide islands, and obtain an island division scheme in a short time while giving full play to the maximum output of DG and recovering as much load as possible.

[0054] The concrete steps of described step...

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Abstract

The invention relates to an active distribution network fault recovery method with consideration of random variation of distributed power supply outputs. The method is characterized by comprising thefollowing steps: step one, carrying out active distribution network island division based on a depth and breadth alternate joint strategy; and step two, on the basis of comprehensive consideration offault recovery whole-period flow changes, carrying out active distribution network reconstruction optimization by using a low-offset stochastic simulation method. Therefore, the maximum output of theDG is utilized fully and loads are recovered as many as possible; and uninterrupted power supply of important loads is ensured.

Description

technical field [0001] The invention belongs to the technical field of active distribution network fault recovery, and relates to a fault recovery method for a distribution network including distributed power generation, in particular to an active distribution network fault recovery method that takes into account random changes in output of distributed power sources. Background technique [0002] Distributed generation (Distribution Generation, DG) technology has been widely concerned by its unique economy and environmental protection. Combined with the distribution network to supply power to users, it can not only improve the power quality, but also improve the reliability of power supply to a certain extent. However, after the access of DG, the structure of the distribution network has changed from a traditional single power source radially to a multi-source and multi-terminal network, and the changes in structure and power flow have also made the operation and control sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/381H02J3/001H02J3/388H02J2203/20
Inventor 丁一张磐唐萍姜惠兰陈娟张愉王旭东刘蒙姜宁陈沛黄潇潇吕跃
Owner ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO
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