Optimal Scheduling Of Microgrid For Comprehensive Hydrogen-electricity Supply

Under the dual pressures of the shortage of traditional energy and the urgency of environmental protection due to the rapid growth of energy demand,we need to actively explore a clean,low-carbon,safe and efficient energy structure.As a smallscale power generation and distribution system that effectively utilizes distributed power,microgrid has received extensive attention.At the same time,adding energy conversion equipment such as electrolyzers and fuel cells to the microgrid to build a hydrogen-electricity integrated energy system has also become a development trend.The multi-energy coordinated energy management strategy in the renewable energy hydrogen production system is one of the main means to ensure the stable operation of the integrated energy microgrid.The frequent start and stop of micro-gas turbine(MT)will not only reduce its service life,but also lead to an increase in start and stop costs.Therefore,this paper proposes an optimal scheduling method for hydrogen-electricity integrated energy microgrid.The specific work content of this paper is introduced in detail.Firstly,in order to realize the economic dispatch of the hydrogen-electricity integrated energy microgrid,this paper proposes a multi-energy integrated and coordinated dynamic dispatch method.By analyzing the operation mode of the microgrid under the changes of renewable energy,hydrogen load and electric load,the energy flow relationship under different conditions is explored to ensure the reliability of hydrogen power energy supply.In addition,a dynamic feedback correction method is proposed in the optimization scheduling process of the hydrogen-electricity integrated energy microgrid to predict the operating state and adjustment capability of each micropower source in advance,so as to avoid frequent startup and shutdown or the longtime low-power operation of MT.Then optimize the output power of other equipment to minimize system operation and maintenance costs.Secondly,in order to obtain typical scenes with time series,this paper uses Kmeans clustering algorithm to obtain typical scenes of renewable energy output and loads demand.At the same time,in order to avoid the subjectivity of artificially specifying the number of clusters,this paper uses the Calinski-Harabaz(CH)index as the basis for selecting the optimal number of clusters K.Thirdly,the optimal scheduling model of hydrogen-electricity integrated energy microgrid is established with the objective function of maximizing the operating income of the microgrid and the load loss,load hydrogen loss rate,wind and light abandonment rate as constraints,and the CPLEX solver is called in MATLAB.The power output of each micro-power supply is solved,and the simulation results are analyzed.The simulation results of the case show that the optimal dispatching strategy proposed in this paper can realize the reliable supply of hydrogen and electric loads,reduce the number of startups and running time of the MT,improve the utilization efficiency of renewable energy,and increase the operating income of hydrogen-electric integrated energy microgrid.