Two-stage power distribution network emergency island division method

Abstract

The invention relates to the technical field of power supply, and particularly relates to a two-stage power distribution network emergency island division method. The method comprises the steps: before a fault occurs, taking the guaranteeing of the stable transition of a system fault moment as a main target according to measurement information of a wide-area measurement system of a power distribution network, continuously solving a pre-fault island division optimization model at a certain time interval, and obtaining a pre-fault original island division scheme meeting the current state of thesystem; carrying out load increasing and load reducing correction of the original island scheme before the fault to obtain an island online division decision table, thereby facilitating real-time query at a fault moment to obtain a load shedding scheme meeting a system real-time state; after the system enters the initial island state through the execution decision table, dividing the whole power failure period into a plurality of time periods according to the estimated power failure time; taking the increase of the number of recovered loads as a target, solving the Look-ahead roll island division optimization model after the fault to obtain the latest island division scheme, and executing the latest island division scheme. According to the invention, the method guarantees the continuous power supply of a key load during the fault.

Description

technical field [0001] The invention belongs to the technical field of power supply, and in particular relates to a method for dividing emergency islands of a two-stage power distribution network. Background technique [0002] Power systems are facing more and more outage events. On the one hand, the increasing probability of natural disasters, such as typhoons and mountain torrents, has led to a large number of equipment failures such as downed poles and disconnected wires; on the other hand, power electronic equipment, such as photovoltaics input, resulting in more complex operation control, which will cause the occurrence of power grid faults. Failure of the transmission network can easily lead to a major blackout in the entire power distribution area. At this time, it is impossible to quickly restore power supply to key loads through traditional load transfer methods, which will seriously affect social production activities in key areas and cause huge economic losses. ...

AI Technical Summary

Problems solved by technology

However, the existing island division strategy generally suffers from the slow data refresh and low precision of the traditional measurement system, which makes it impossible to grasp the status of the power distribution system in real time. All of them will experience short-term power outages for black start, and cannot guarantee the continuous power supply of key loads; and A deterministic island division scheme is formed, and the island scheme cannot be flexibly modified to deal with new energy power fluctuations to ensure continuous power supply for key loads

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