Optimization Of Wind-photovoltaic-hydrogen Storage Capacity For Cascade Hydropower Stations Considering Multi-energy Complementarity

With the increasingly severe environmental pollution and energy crisis,increasing the proportion of renewable energy consumption and promoting energy substitution has become a major trend at present.Combined with the current status of China’s electric power industry development,make full use of existing hydropower station near the scenery resources,according to the resources condition of the hydropower station valley near adjust measures to local conditions,play to the complementary features between different energy,to improve the ways of use and promote renewable energy given and improve energy utilization has important significance.However,the regulating capacity of hydropower station has obvious seasonal difference,which leads to the imbalance of seasonal power supply and demand.Therefore,it is necessary to further regulate by adding energy storage system.In this paper,a novel wind-solar-water and hydrogen multi-energy complementary energy system is proposed,which is mainly composed of cascade hydropower,combined with wind-water output facilities and hydrogen storage system.Hydropower station and hydrogen energy storage system regulate the wind power generation to suppress the fluctuation of wind power output,ensure the safety of distribution network operation under the condition of system connection,and solve the seasonal imbalance between supply and demand of renewable energy power generation system.At present the promotion of renewable energy is subject to the construction cost is higher,reasonable planning and the beautiful scenery of the matching the capacity of the storage facilities existing hydropower station configuration is particularly important,so this article from the economic point of view of landscape water storage can complementary advantages,the existing cascade hydropower station construction scenery output facilities and energy storage system for the configuration and capacity optimization research.This paper first introduces the principle of multi-energy complementary system and the research status of multi-energy complementary system,verifies the feasibility of multienergy complementary output through the analysis of wind-water complementary characteristics,and verifies the superiority of hydrogen energy storage technology through the comparative analysis of energy storage technology,which lays a theoretical foundation for the model construction.Secondly,the structure and operation characteristics of the multi-energy complementary system of cascade hydropower stations combined with windenergy hydrogen storage are described.On this basis,a two-level programming model was established,in which the upper model was optimized to maximize the annual net income,and the lower model was optimized to maximize the daily operating income of the system.The material balance,system output constraints,hydrogen storage constraints and other conditions were fully considered.Finally,taking a cascade hydropower station in a river basin as an example,three investment schemes are designed to verify the effectiveness of the designed model and energy management strategy,and it is concluded that the use of multi-energy complementarity strategy can increase the total power generation and revenue of the system.The multi-energy complementary system of the cascade hydropower station constructed in this paper considering the solar hydrogen storage can promote the absorption of various renewable energy sources to a certain extent,improve the regional energy integration development degree,and improve the stability and economy of the system while meeting the regional load demand.This study provides theoretical support for the construction of multi-energy complementary energy base near the watershed,which can further tap the development potential of renewable energy and accelerate the largescale and high-proportion development process of renewable energy.