Research On Optimal Operation Of Energy Systems Including Hydrogen Production Units Under Integrated Demand Response

With the intensification of global environmental pollution and the requirement to adjust the energy structure,hydrogen has gradually become a research hotspot around the world due to its renewability and cleanliness.The rational utilization of hydrogen energy is an effective way to solve environmental pollution and wind abandonment problems.The integrated energy system containing electric-hydrogen production devices is an important physical carrier to the future energy Internet.By optimizing the scheduling of such an integrated energy system,the coupling characteristics between each subsystem in time and space can be fully utilized to achieve higer energy efficiency,such as energy complementation,energy cascade utilization,promotion of clean energy consumption and effective reduction of wind abandonment.Meanwhile,the potential of demand response can be explored to provide ancillary services,so that the energy bills for users can be reduced while the asset utilization ratio can be improved.Furthermore,the emergence of integrated demand response will enhance the coupling between different energy forms,and thus enabling users with a variety of response approaches.Based on the above background,this thesis mainly studies the following aspects:(1)An optimization model is built for the integrated energy system containing wind power hydrogen production units,within which the various operation modes of each device,the conversions between multiple energy sources,and the energy consumption characteristics of various types of loads are considered.The simulation results verify the effectiveness of the proposed model,with a particular analysis on the role of wind power hydrogen production equipment in reducing system operation cost and promoting wind power consumption.In addition,by comparing the system operation conditions under different hydrogen load requirements,the significance of rationally arranging hydrogen load to promote system economic and cleaniness is studied.(2)Referring to the demand response of the power load,a price-based demand response model for a hydrogen-contained integrated energy system is proposed,and then solved by electricity-price elasticity matrix.Users are divided into four categories:soft heavy industrial users,soft medium industrial users,general commercial users,and residential users based on their energy consumption characteristics and different response levels to price signals.In case study part,the changes of varies load profiles,electricity purchasing cost and the user satisfaction level under different pricing modes and wind power outputs are compared.Futher,the impact of power load demand response to the economy and renewable energy consumption in the integrated energy system is analyzed.(3)Considering the demand response capabilities of electricity,heat,and hydrogen loads,an integrateddemand response model is proposed for the hydrogen-contained integrated energy system.Energy hub is selected as the physical carrier to process the information flow and the multi-energy conversions.By studying the operation mechanism of the energy hub and energy coupling matrix,the physical models of energy hubs for residential,commercial and heavy industry users are build.Based on the day ahead time-of-use electricity price reflectiong marginal costs,transferable loads and convertible loads are introduced to realize the integrated demand response of users.Then,the integrated demand response for the hydrogen-contained integrated energy system is studied with the goals to minimize total social cost,user energy cost,and the operating cost of the energy supply side,respectively.Finally,the effects of the integrated demand response on the improvement of the system economy and renewable energy consumption capability are analyzed,so that the rationality and effectiveness of the propsed model can be verified.