Method and system for evaluating restoration capacity and reliability of power distribution network

A power distribution system and reliability technology, applied in information technology support systems, electrical components, circuit devices, etc., to achieve the effect of improving flexibility, shortening calculation time, and reducing load shedding

Pending Publication Date: 2022-01-14
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a distribution network resilience and reliability evaluation method and system for the above-mentioned deficiencies in the prior art, which solves the problem of distributed power access and power distribution through network reconstruction after a fault System Resilience and Reliability Assessment Issues

Method used

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  • Method and system for evaluating restoration capacity and reliability of power distribution network
  • Method and system for evaluating restoration capacity and reliability of power distribution network
  • Method and system for evaluating restoration capacity and reliability of power distribution network

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Embodiment

[0126] The IEEE-33 node system is used as the test system, the rated voltage is 12.66kV, the total load is 3.715MW, there are 33 load buses in total, and distributed power is connected to the 15, 22, 25, and 30 load bus positions, and the capacity is 0.5MVA. , it is assumed that after the distribution network fails, the power supply capacity of the main network to the distribution network is limited, which is 1.5MVA.

[0127] It is calculated and solved by the optimization solver that only 1.268MW can be recovered without considering the DG access, and the recovery ratio is 34.1%, so all the power-loss loads cannot be recovered through the isolation fault; under the condition of DG access, such as figure 2 As shown, part of the load can be powered by the distributed power source, but after the line located downstream of the DG fails, the power supply cannot be restored. After the line S30 fails, the optimal microgrid division result is obtained using the above optimization met...

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Abstract

The invention discloses a method and a system for evaluating restoration capacity and reliability of a power distribution network. The method comprises the steps of: establishing a power distribution system element reliability model, and determining the influence type of each element fault on each load in the power distribution system element reliability model through employing a minimum path method; establishing a fault influence table, performing power distribution system operation simulation by using a Monte Carlo method, and when a fault occurs, reconstructing a power distribution system network; and querying a corresponding influence type in the fault influence table, counting power failure times and power failure duration, and calculating a reliability index according to the power failure times and the power failure duration to realize reliability evaluation. By means of the method, more loads can be restored, the load shedding amount is reduced, the restoration capacity of the system after disasters is improved, and the elasticity of the power system is improved.

Description

technical field [0001] The invention belongs to the technical field of power distribution systems, and in particular relates to a distribution network resilience and reliability evaluation method and system. Background technique [0002] Compared with the power generation and transmission system, the power distribution system has a closer relationship with users, and its reliability determines whether the power system can achieve reliable and continuous power supply to users. Building a resilient and resilient power system is one of the main methods for countries to deal with extreme events such as large-scale natural disasters. Among them, connecting distributed power sources and post-disaster reconstruction networks to improve the resilience of distribution networks is the preferred method. With the continuous access of large-scale distributed power sources, the distribution network has changed from a passive network to an active network. The massive access of distributed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06Q10/06G06Q50/06
CPCH02J3/00G06Q10/0639G06Q10/06393G06Q50/06H02J2203/20H02J2203/10Y04S10/50
Inventor 凌毓畅田慧丽周荣生李欣许达
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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