Research On Operation Energy Management Strategy Of Gas Electricity Combined Micro Grid

In the context of increasingly serious global energy shortages and increasing environmental burdens,the development and utilization of new energy has become a practical problem that all countries in the world are striving to face.Increasing attention has been paid to the development,use and storage of clean energy.Wind power and photovoltaic power generation are one of the most important forms of development and utilization of new energy sources.Because of their inherent randomness,volatility and uncertainty,the impact of wind power and photovoltaic power generation on the power grid cannot be ignored.Especially at present,wind energy and photovoltaics account for a large proportion of the grid,and the problems caused by this are particularly prominent.In recent years,the installed capacity of wind power and photovoltaic power generation has continued to increase,and at the same time it has also brought about the waste of energy such as abandoning solar and wind.At the same time,hydrogen energy storage is a new type of energy storage method in the grid,which has the advantages of high energy density,large energy storage capacity,green and clean,and long service life;compared with traditional energy storage methods,storage and transmission are more convenient,Is considered to be the most ideal energy storage mode at present.Therefore,the comprehensive development and utilization of a joint hydrogen storage system has become the best solution for the efficient operation of wind energy and photovoltaics.Based on the in-depth analysis of the optimized operation of the gas-power integrated energy system,this paper takes into account the actual conditions such as wind abandonment and solar abandonment,and conducts a model design.Through simulation and physical experiment testing,the gas-power integrated energy system is studied.Coordinate control strategy and online energy management strategy,the main contents are:(1)Combining with the science and technology project of State Grid Shandong Electric Power Company-"Research on Cooperative Optimization Control Technology for Medium and Low Voltage Sources and Network Loads under the Background of Energy Internet",the mathematical model of the electricity-to-gas system is established and the system is analyzed theoretically by SIMULINK software.On the basis of detailed comparison and study of a large number of research papers and research results at home and abroad,the complex electricity-to-gas system is decomposed into independent subsystems,such as photovoltaic panel power generation system and polymer electrolytic cell electrolysis system.Established and perfected PEM electrolysis system,and simulated each subsystem with SIMULINK software.After analyzing the simulation results,the operating characteristics of each subsystem are determined,and on this basis,the energy management strategy of the entire system is designed and formulated.(2)By proposing an extended energy hub model,based on considering the participation of solar photovoltaic(PV)power generation and renewable energy power generation and energy storage technology(BESS,P2G).Analyze daily load requirements(such as electricity,heat,and cooling)and time of use(TOU)energy prices to set up optimization problems.In order to optimize the total energy cost,a mathematical model was constructed,which includes some constraints,such as the input and output energy balance of the energy hub,electricity prices,system capacity limitations,and P2 G energy storage efficiency.The operation cases based on different energy hub structures were compared to evaluate the impact of solar energy applications and BESS and P2 G on operational efficiency.(3)Based on the research of the topological structure,working principle and control strategy of the photovoltaic system and PEM water electrolyzer system in the first two chapters,the influence degree of each module in the energy storage microgrid on the system energy consumption is analyzed in detail.At the same time,the energy distribution and operation management are modified and improved in terms of control strategy and system parameter values.On the basis of the previous construction,a complete DC microgrid simulation model was built,and simulation tests were carried out in the case of grid-connected and isolated islands,and the feasibility and effect of the energy management improvement measures proposed above were analyzed.