Research On The Reliability Study Of Isolated Microgrid Containing Compressed Air Energy Storage System

In the face of shortage of fossil fuel and increasingly serious air pollution caused by excessive carbon emissions,the operation of microgrid linking with renewble energy generation system has become normal state.However,because of the many characteristics of new energy,there is a certain shortcoming in the aspect of continuous stability of the generation system,which also presents new challenges to the reliability of microgrid linking with renewable energy generation system.This has also become one of the hot issues about the research on microgrid all over the world.In this case,setting up energy storage equipment is one of the main methods to deal with these challenges,and the research on the reliability of microgrid linking with different forms of energy storage equipments has become an urgent problem.In addition,with the development of the Energy Internet and deepening of the coupling degree among different energy sources,interaction of different forms of energy in microngrid has a certain effect on its reliability.In this thesis,the reliability of microgrid is studied separately from both the energy storage system itself and the whole microgrid.Firstly,the structure of microgrid with compressed air storage system is analyzed,and the power models of generating equipments including microgas turbine,wind power unit,photovoltaic power array and compressed air storage system and load model are established.Then,the boundary risk theory applied to the reliability evaluation of microgrid is introduced.Secondly,characteristics of different hot sources in the hot end of heat exchanger are analyzed,and the dynamic models of the various parts related to generating process of the compressed air storage system are established in this thesis.Then,the simulation of the dynamic model of the whole compressed air storage system is established by Mtalab/Simulink,and the effect to surplus of air storage in air tank in compressed air storage system is analyzed,caused by importing different hot sources in the hot end of heat exchanger.Finally,from the overall level of isolated microgrid,the reliability model of each generation system is established.The failure rate model of equipment that considers the total operating time and weather condition of the equipment is proposed.The time model for the repair time of the fault equipment maintenance condition is put forward.The strategy of isolated microgrid power adjustment is proposed based on the residual capacity of the storage system.The load reduction method considers the electrical distance and load grade factors of the load distance of the network.This thesis puts forward the method of reliability evaluation of isolated micronetwork based on boundary risk theory.The validity of this method is verified by an isolated microgrid as an example.