Study On The Short-term Optimization Of Hydro-thermal Power Systems Considering Cascade Hydropower Station To Produce Hydrogen

The optimal dispatching of hydro-thermal power systems that conforms to the concept of low-carbon and energy-saving dispatching is one of the research focus in the power dispatching field of China.However,how to solve the water spillage in cascade hydropower stations is the difficulty in the optimal dispatching.The combination of water spillage and hydrolytic hydrogen production technology provides a new idea for solving this problem,which can realize the reasonable consumption of surplus electrical energy of cascade hydropower stations and promote the reuse of water spillage.However,detailed models and optimization strategies have not been proposed for the water spillage of cascade hydropower stations to produce hydrogen.In order to effectively solve the problem of water spillage,a short-term optimization method of hydro-thermal power considering the water spillage of cascade hydropower stations is proposed in this paper.The main studies as follows:Firstly,the fuel consumption characteristics of thermal power generating units are introduced.The operational characteristics of cascade hydropower stations are described,including hydropower output characteristics,hydraulic connections between the different levels of cascade hydropower stations,cascade hydropower station sprinkler characteristics,and cascade hydropower station flow hysteresis characteristics,etc.Besides,relevant mathematical models are established to lay the foundation for subsequent chapters.Secondly,an optimal scheduling strategy for the utilization of hydropower of cascade hydropower stations considering the generation of hydrogen from water spillage is proposed in this paper.Based on the operating characteristics of cascade hydropower stations,the mathematical model of multi-objective short-term optimal dispatch of hydrothermal power system considering cascade hydropower station’s hydrogen production is constructed.The model takes the minimum cost of thermal power generation and the minimum total amount of water discarded in the last stage of cascade hydropower stations as the objective function,considering network power flow constraint,electrolyzer hydrogen production constraint,the traditional constraints of the hydro-thermal power system,and the impact of water flow delay on the operation and scheduling of cascade hydropower stations.In the proposed strategy,the surplus electrical energy of cascade hydropower stations is used to generate hydrogen,leading to the surplus electric power of the hydropower stations is absorbed,the cascade water spillage is reduced,and the overall economy is improved.Then,simulation and analysis are performed based on the proposed scheduling strategy and mathematical model in the IEEE-24 bus system.The effectiveness can be verified by the simulation results of the proposed method comparing with the traditional single-objective optimization model and multi-objective optimization model in the hydropower system.Finally,the whole paper is summarized,and the research works,which can be further studied,are pointed out.