Method and system for improving toughness of power distribution network

Abstract

The invention discloses a method and system for improving the toughness of a power distribution network, and the method comprises the steps of carrying out the importance evaluation of a power distribution network assembly in typhoon weather, building an element fault rate model under the action of storm wind, carrying out the sampling of the state of a wind power generation system through a non-sequential Monte Carlo simulation method, and establishing an optimal recovery strategy model and sorting the importance degrees of the components; when a disaster occurs, a fault condition is obtained, recovering elements with high importance preferentially according to a determined sequence, and improving the robustness of the power distribution network; forming a plurality of micro-grids through pre-deployment of mobile emergency generator cars before disasters and real-time scheduling after disasters, building a target function by taking minimization of power failure time of important loads in different scenes as a target, forming an MILP problem through the target function and constraint conditions, obtaining the real-time distribution condition of the mobile emergency generator cars after disasters by solving the corresponding problem, and completing power distribution network recovery and promotion. According to the invention, the robustness of the power distribution network is improved; the power distribution network fault recovery time is shortened, and the power distribution network recovery rapidness is realized.

Description

technical field [0001] The invention belongs to the technical field of power system safety planning and operation, and in particular relates to a method and system for improving resilience of distribution networks. Background technique [0002] Frequent natural disasters in recent years have brought serious challenges to the power system, highlighting the shortcomings of the power system's insufficient ability to deal with extreme disasters, especially typhoons have a wide range of impacts on the power system, strong destructive power, and typhoons land and pass During this period, the trips of power grid equipment were frequent and time intensive, and most of them were permanent faults. It was difficult to recover the faulty equipment in time. As a key link that directly serves users, the distribution network is prone to severe power outages under typhoons. For example, in 2017, the typhoon "Hato" caused a total of 35 trips of 10 kV lines in Guangzhou, and 18 failed coincid...

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Problems solved by technology

[0002] Frequent natural disasters in recent years have brought serious challenges to the power system, highlighting the shortcomings of the power system's insufficient ability to deal with extreme disasters, especially typhoons have a wide range of impacts on the power system, strong destructive power, and typhoons land and pass During this period, there are many trips of power grid equipment and the time is concentrated, and most of them are permanent faults. It is difficult to restore the faulty equipment in time. As a key link that directly serves users, the distribution network is prone to serious power outages under typhoons

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