| Due to the strong uncertainty and anti-peaking characteristic of new energy power generation,its large-scale integration makes the system dispatching and operation more complicated.The peak regulation and new energy accommodation problems are becoming more and more prominent,especially in the power system with thermal power units as the main power source.Hydrogen energy storage is a new type of energy storage technology with large-scale capacity,fast response speed and long energy storage cycle,it can improve the flexibility of the system dispatching by playing its multi-energy coupling role on the power side and load side,which is theoretically an effective way to relieve the peak regulation pressure of the system and promote new energy accommodation.Therefore,in order to meet the demand of new energy accommodation,this paper considers the dual "source" and "load" characteristics of hydrogen energy storage,and discusses the multi-energy complementary optimal dispatching strategies with hydrogen energy storage.The main work is as follows.Firstly,considering the flexible regulation capability of hydrogen-fired gas turbines,a hydrogen energy storage unit(HESU)based on hydrogen-fired gas turbine is built,the technical characteristics of which are studied and the models are established.Hydrogen energy storage is compared with electrochemical energy storage,and the main problems that limit the development of hydrogen energy storage at present are explained.The operation mechanism,technology classification and application status of hydrogen production technology by water electrolysis of renewable energy,hydrogen energy storage technology,and hydrogen-fired gas turbine power generation technology are discussed respectively,and the equipment models are established.Secondly,the optimal operation mechanism of a multi-energy complementary system with HESU is studied,and an optimal dispatching strategy based on HESU is proposed.The HESU based on hydrogen-fired gas turbine is introduced to establish an electricity-heat-hydrogen complementary system(EHHCS),whose optimal operation mechanism and regulation strategy are studied.Considering the multi-energy conversion efficiency,an dispatching model based on HESU is established with the objective of minimizing total power generation costs,whose effectiveness is verified by simulation.The results show that adopting hydrogen-fired gas turbine as the generator of HESU is a feasible scheme.The power utilization efficiency of HESU is about 75%,which reaches the energy efficiency level of pumped storage.And the system configured with HESU shows higher peak regulation capability and wind power accommodation level than electrochemical energy storage.Lastly,due to the limited peak regulation capability of traditional power side,and in order to explore the load-side peak regulation potential,a hydrogen storage-active load(HS-AL)with multi-energy coupling characteristic is incorporated into the load system,the demand response characteristics of which are studied,and a multi-energy complementary optimal dispatching strategy considering the demand elasticity of HSAL is proposed.Hydrogen energy storage is combined with load-side flexible resources to form an HS-AL with multi-energy coupling characteristic,and its response model is established.Taking into account the response characteristics of internal equipment and terminal loads,the external demand elasticity of HS-AL actively participating in the system dispatching is explored in depth.With the objective of minimizing total power generation costs,a multi-energy complementary optimal dispatching model considering the demand elasticity of HS-AL is established,whose effectiveness is verified by simulation.The results show that the elasticity of HS-AL can be fully utilized to promote wind power accommodation and effectively relieve the deep regulation pressure of thermal power units at night,thus realizing the optimal dispatching and economic operation of the system. |
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