| In recent years,in order to actively respond to global climate change,countries have successively established carbon neutrality targets.The energy industry,as a key sector in reducing carbon emissions,is promoting a green and low-carbon transition through large-scale integration of renewable energy.However,the uncertainties of renewable energy and the rapid growth of new electricity loads have exacerbated the contradiction between electricity supply and demand,particularly at the level of distribution network,posing significant challenges to system protection,control,planning and operation.To address this issue,the concept of constructing a diversified and highly-resilient power grid has been proposed,promoting systemic reform in the distribution network and ushering in an era of high resilience.Research on the high resilience level evaluation and optimization strategies of the distribution network under multiple coupling is conducive to ensuring the common realization of the safety,low carbon and economic goals of the distribution network,better integrating new energy,and promoting the sustainable development of the system and the efficient construction of the smart grid.Based on a detailed review of relevant research status at home and abroad,combined with the shortcomings of existing studies and areas for further exploration,this paper deeply analyzes the evolution path of distribution network development forms,constructs the evaluation model of high-resilience level of distribution network,and explores an optimization strategy system based on the enhancement of high resilience,so as to achieve a win-win situation between high-resilience construction of power grid and carbon emission reduction target.In terms of morphological evolution analysis,this paper introduces the theory of complex adaptive systems,unpack the distribution network into four main bodies:source,grid,load and energy storage,build a hierarchical model from micro elements to macro systems from the bottom up,study the evolutionary dynamics and interaction mechanisms of the system,and describe the single-agent stimulus-response model of the distribution network and the multi-agent coupling model of the system.The evolution process of the system is divided into three stages:primary stage.intermediate stage and advanced stage,and the system characteristics,system functions and evolution forms of each stage are summarized.In the evaluation of high resilience level,a multi-level indicator system is designed based on the "four highs" attributes,and a comprehensive evaluation model is constructed by introducing OWA-AHP,entropy weight method,game theory and cloud matter-element theory.The resilience level is divided into five levels for practical case analysis.The evaluation results show that the current grid with high interaction and high efficiency is generally poor.The overall resilience level needs to be improved,and there is still a certain gap between the completion of high-resilience power grid.In terms of optimization strategy research,a strategy system of "one base,four routes"is proposed,the key paths of the construction of resilience enhancement resource library,resilience enhancement scenario library and resilience enhancement technology library are analyzed in detail,and the coupling optimization strategy which includes source,grid,load and energy storage is deeply discussed,which is typical of the integration of foptical storage and charging" and adjustable load response.A differentiated V2G charging model of "day and night" was developed.Through multi-scene and multi-mode comparative analysis and online real-time optimization of simulated annealing algorithm,the promotion effect of the proposed strategy in reducing the peak valley difference of load and electricity cost was verified.The research findings of this paper,in theory,enrich the theoretical method system for the study of distribution network evolution,expand the connotation of resilience,open up a new vision for the evaluation of distribution network resilience,and provide direction for the optimization and improvement of distribution network,In practice,a set of optimization strategy systems for enhancing high resilience in distribution networks is proposed.and a coupled interaction model for the full interaction of source-network-load-storage is designed.which has certain practical guiding significance for activating the flexible resources of the system and guiding the construction of high-resilience distribution network. |
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