| Driven by the goal of "dual carbon",the construction of flexible power supply and demand side response capacity will be the only way to build sustainable energy grid in the future.Cogeneration microgrid is an efficient energy supply model and will be involved in it.At the same time,heat storage technology plays an important role in power flexibility modification,demand side management measures,renewable energy consumption and other forms of application.Therefore,this paper studies the phase change material energy storage technology,introduces it into the combined cooling,heating and power microgrid,and studies its capacity configuration.The main research contents are as follows:First,the working principle and application of phase change material energy storage were studied.Analysis and comparison of building phase change material energy storage wall and box type phase change material energy storage.According to the development status of phase change energy storage technology.The box type phase change material energy storage was selected and introduced into the combined cooling,heating and power microgrid to construct the combined cooling,heating and power（PCMES-CCHP）microgrid containing phase change material energy storage.The problems of mismatch between supply and demand of renewable energy and large peak-valley difference of power grid have been solved.Mathematical models have been established for phase change material energy storage and other energy equipment in microgrid,laying a theoretical foundation for subsequent research.Secondly,in order to verify that phase change material energy storage can achieve the effects of carbon emission reduction and peak load cutting,a multi-objective programming model was established for PCMES-CCHP microgrid with economy,energy consumption and carbon emission minimization as the objective function.Multi-objective evolutionary algorithm was used to solve the model,and a series of Pareto solutions were obtained.The optimal configuration scheme is obtained by using the two-way projection method based on direct fuzzy theory.The results show that compared with the traditional CCHP microgrid,the PCMES-CCHP microgrid constructed in this paper can reduce the demand for energy equipment capacity due to the existence of phase change material energy storage,and can effectively reduce the carbon emissions of the microgrid,and assist the power grid in peak cutting and valley filling.Finally,based on the existing PCMES-CCHP microgrid,considering the thermal inertia of the building and the comfort of the human body,virtual energy storage is introduced.The virtual energy storage of the microgrid is modeled and analyzed,and the two-layer planning model of the microgrid is established.The configuration scheme is compared with the result in Chapter 3.The results show that virtual energy storage can reduce the capacity of physical energy storage in the microgrid,thus improving the economy.Meanwhile,virtual energy storage can further reduce the carbon emissions of the microgrid and help achieve the goal of "dual carbon". |
