Resilience Evaluation And Enhancement For Island Microgrid Clusters Against Extreme Disasters

In recent years,the development and utilization of islands and their surrounding area has grown rapidly around the world,and more and more islands have been developed and utilized.As an important area for ocean development and land-sea space continuation,islands not only have abundant and abundant renewable clean energy such as wind and solar energy,but are also important platforms for safeguarding national sovereignty and maritime rights and interests.At present,the theoretical research and practical application of island power supply can gradually provide an effective solution for the reliable power supply of the island.However,due to the special geographical location of the island,extreme natural disasters such as typhoons and tsunamis frequently attack the island group,which seriously threatens the safe and reliable power supply of the island micro grid group.In order to improve the ability of island microgrids to resist typhoon disasters and enhance the ability of microgrids to quickly restore power supply,this paper proposes a resilience assessment and resilience improvement strategy for island microgrids that takes into account extreme natural disasters.The main research contents are as follows:1)According to the structural characteristics of the island microgrid cluster,the island microgrid system model was established,including the island wind power generation model,the photovoltaic power generation model and the diesel generator model,and the island microgrid flow model was studied;then,the island microgrid was constructed.The typical scene feature model of the network group divides the islands into two categories: resource enriched islands and load center islands,and analyzes the specific subdivision of the sea area before and after the typhoon;constructs a typhoon wind field model,and studies line failures under typhoon weather The impact of typhoon on the line failure rate on the island is analyzed through practical examples,which lays a theoretical foundation for the subsequent realization of the assessment and improvement strategy of the resilience of the island micro grid cluster system.2)In order to evaluate the energy supply and recovery capability of the island microgrid cluster system after suffering extreme natural disasters,it is constructed from four aspects: the failure rate,robustness,rapidity and the weight of each island’s load of the island microgrid cluster system.The comprehensive resilience evaluation index of island micro grid cluster is used to comprehensively evaluate the resilience of island micro grid cluster system;and the impact of different resilience improvement strategies on the resilience of island micro grid cluster is evaluated with the help of this comprehensive index,and the research on the proposed resilience improvement measures has laid a foundation.The correctness and effectiveness of the proposed resilience assessment method are verified.3)In order to improve the energy supply and recovery capability of the island microgrid cluster system after extreme natural disasters,a whole process improvement strategy for the resilience of the island microgrid cluster in response to the typhoon was proposed by taking the natural typhoon disaster as an example.Through the strategies of energy storage scheduling before the disaster,optimal load shedding during the disaster,and optimizing the emergency repair sequence of the faulty line after the disaster,the resilience of the island micro grid cluster against typhoon disasters is improved;and the proposed resilience is improved by an example to improve the effectiveness and economy of the strategy.Through analysis and verification,the results show that the proposed resilience improvement strategy can enhance the resilience of island microgrids against typhoon disasters.