Research On Optimal Scheduling Of Integrated Energy System With Hydrogen Energy Coupling Utilization

With the rapid development of social economy and technology,the world ’ s total energy consumption is also rising.Fossil energy reserves tend to be tight,and the use of traditional energy based on coal will emit a large number of pollutants,which also brings many problems to environmental protection.In the context of China ’s carbon peaking and carbon neutrality goals,it is of great significance to optimize our overall energy structure and gradually re place traditional energy with clean and efficient renewable energy.The emergence of the Integrated Energy System(IES)has brought a way to solve the above problems,and has a good effect on improving the efficiency of energy utilization and the access space of new energy output.IES is mainly a multienergy system with power system as the core and coupled by electricity,gas,heat and other networks.It has broad prospects in realizing comprehensive energy utilization,resource allocation and information sharing.Multi-energy collaboration and distributed power supply are the main characteristics of IES.The coupling of multiple energy sources enables consumption terminals to have more convenient,flexible and efficient forms of energy use to meet their own needs.Distributed power is mainly reflected in the fact that the role of energy supply and demand is no longer fixed as in traditional networks.Users can share surplus resources with others while meeting their own energy needs.Compared with the traditional single energy network,the IES has the characteristics of high energy utilization rate and low pollution emissions,and has become the development trend of the future energy network.The research contents of this thesis are as follows :1)Due to the small load demand at night and the large output of wind power at night,there will be large-scale wind abandonment,resulting in energy waste.In response to this situation,this thesis proposes an electric-heat-gas-hydrogen IES.The energy supply part includes wind turbines,photovoltaic units,superior power grids,superior gas grids,and energy storage devices in the output state;the energy conversion part includes a generation unit,a hydrogen energy coupling unit and a gas boiler;the energy storage part includes a hydrogen storage tank in a gas storage state,a battery in a power storage state and a heat storage tank in a heat storage state.The mutual conversion of multiple energy sources is realized through multiple coupling devices,so that the comprehensive energy system can achieve multi-level utilization of multiple energy sources such as electric energy,hydrogen,natural gas,etc.,and meet the user’s multiple energy consumption needs.2)Aiming at the difference of different energy management time scales in IES and the uncertainty of renewable energy and load,a multi-time scale low-carbon scheduling strategy of electricity-heat-hydrogen IES considering multiple demand responses is proposed.Firstly,considering the different response characteristics of demand-side resources at different time scales,a day-ahead-intraday multi-excitation demand response model is established.Secondly,in order to give full play to the lowcarbon clean characteristics of hydrogen energy,a hydrogen energy coupling system composed of electrolytic tank,hydrogen fuel cell,methane reactor and hydrogen storage tank is introduced,and an optimal scheduling model of electricity-heathydrogen IES is constructed.Then,a day-ahead low-carbon scheduling model of electricity-heat-hydrogen IES based on day-ahead demand response is constructed with the goal of minimizing the sum of energy purchase cost,step carbon transaction cost and operation and maintenance cost.Considering the response difference of electricity-heat energy at different time scales,a double time scale rolling optimal scheduling model based on intraday demand response is established to stabilize power fluctuation.3)Aiming at the complexity of multi-regional IES cooperative operation,a lowcarbon operation model of multi IES based on cooperative game is proposed.Considering the mutual transaction between IES,a low-carbon operation strategy of multi IES based on cooperative game is proposed.In order to protect the internal data privacy of each IES,the distributed alternating direction multiplier method(ADMM)algorithm is used to divide the coupling variables,and the cooperative game problem is decomposed into sub-problem P1 and sub-problem P2,so as to realize the minimum social cost of the overall system alliance and the maximum payment benefit of each subsystem.Under the premise of ensuring the privacy of the internal operation data of each integrated energy service provider,the model is solved effectively and quickly,so as to obtain a low-carbon operation strategy to reduce the total cost of IES.