Diamond type power distribution network-based power grid reliability evaluation method

Abstract

The invention relates to a diamond type power distribution network-based power grid reliability evaluation method, which specifically comprises the following steps of S1, acquiring operation information of each power grid device in a diamond type power distribution network, and constructing a shutdown model of each power grid device by adopting a two-state Markov chain; s2, according to the outage model of the power grid equipment, analyzing each state of the power grid equipment by adopting an analytical method to obtain the fault probability of each power grid equipment; s3, analyzing the influence of the fault of each power grid device on the diamond-type power distribution network system by adopting a fault mode influence analysis method, and obtaining the power failure time and the power failure frequency of each load point; and S4, performing statistics on the power failure time and the power failure frequency of the load point to obtain the total power failure time of the diamond-type power distribution network, and performing calculation according to the total power failure time of the diamond-type power distribution network to obtain a reliability evaluation result of the diamond-type power distribution network. Compared with the prior art, the method has the advantages of improving the accuracy and stability of the reliability evaluation result of the diamond-type power distribution network and the like.

Description

technical field [0001] The invention relates to the technical field of power grid evaluation, in particular to a diamond-shaped distribution network-based power grid reliability evaluation method. Background technique [0002] At present, various cities have launched a new round of distribution network upgrades to meet the needs of load growth and urban development. However, the problems and challenges faced by medium-voltage distribution networks are still diverse, mainly reflected in the following four aspects: (1) At present, the cable network is mainly based on the single-ring network of switching stations powered by one-sided power supply. In the event of a fault, the load transfer capacity between stations is insufficient, which affects the safety of power supply; (2) The high-voltage distribution network is facing a large-capacity 110kV main The long-term coexistence of substations and small-capacity 35kV main transformers, and the current lack of inter-station load b...

AI Technical Summary

Problems solved by technology

Although the ultimate goal of construction is a diamond-shaped distribution network, since the diamond-shaped distribution network is only a grid structure, there are still large differences between different diamond-shaped distribution networks, such as the backbone of the diamond-shaped distribution network. The number of switch stations carried by the network, the capacity of each switch station, the connection structure between the switch station and the ring network, etc. Therefore, it is necessary to accurately evaluate the reliability of the final state of the diamond-shaped distribution network construction and transformation, so as to Optimizing and improving the diamond-shaped distribution network constructed and transformed

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