Power distribution system reliability assessment method considering distributed power supply

Abstract

The invention discloses a power distribution system reliability assessment method considering a distributed power supply. The power distribution system reliability assessment method is characterized by comprising the following steps: S1, establishing an output power probability model of the distributed power supply; S2, establishing a load time-sequence dynamic model; S3, calculating the successful operation probability of an island based on the output power probability model of the distributed power supply and the load time-sequence dynamic model in the island; S4, for load points in the island, acquiring the reliability index of second-class load points according to the successful operation probability of the island and a minimum path method after improvement; and S5, acquiring the reliability index of first-class load points, acquiring system reliability index according to the reliability index of the first-class load points and the reliability index of the second-class load points, and carrying out assessment on power distribution system reliability according to the system reliability index. According to the power distribution system reliability assessment method, the actual power output level and load dynamic characteristics of the distributed power supply can be reflected, and the island operation manner of a power distribution system is sufficiently considered, so that the actual operation condition of a power grid is met, and the method is suitable for the power distribution system reliability assessment containing the distributed power supply.

Description

technical field [0001] The invention relates to the field of power distribution system reliability assessment, and more particularly, to a power distribution system reliability assessment method considering distributed power sources. Background technique [0002] The power distribution system is located at the end of the entire power system and is directly connected to the users. It is an important link that affects the reliability of the power supply of the power grid. Statistics show that most power outages are caused by faults on the distribution network side. Therefore, the reliability assessment of the power distribution system has always been have received extensive attention. [0003] In recent years, Distributed Generation (DG) has been increasingly integrated into the power distribution system due to its high efficiency, flexibility and environmental friendliness. The power distribution system has changed from a single power source radiation network to multiple powe...

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a distribution system reliability evaluation method considering distributed power, which aims to solve the problems of long time consumption, inaccurate calculation results and difficulty in reflecting the fluctuation of load in the prior art. and the actual output level of different types of DG

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