Optimal Configuration Of Hybrid Electrolytic Water Hydrogen Production System To Smooth Out Wind Power Fluctuations

Due to wind power’s volatility and intermittency,the output power of wind farms cannot directly meet the requirements of grid stability,which limits the development of wind power generation.Hydrogen energy has received wide attention as a good energy carrier.By building a wind-hydrogen mixed energy system and making full use of the excellent characteristics of electrolytic water hydrogen production device with fast response time,not only can the fluctuation of wind power be smoothed,but also the hydrogen produced can be further applied to improve the system economy.This thesis focuses on the power allocation method and capacity allocation strategy of the hybrid electrolytic water hydrogen production system to smooth out the fluctuation of wind power output,and conducts a systematic study on the modeling analysis of electrolytic water hydrogen production device,the method to smooth out the fluctuation of wind power output,and the capacity allocation optimization of hybrid electrolytic water hydrogen production system.The main research contents of this thesis are as follows.1.Modeling and analysis of operating characteristics of electrolytic water hydrogen production plant.Based on the operating principle of hydrogen production from electrolytic water,the proton exchange membrane electrolyzer and alkaline electrolyzer are modeled and analyzed.For the proton exchange membrane electrolyzer,a proton exchange membrane electrolyzer test bench is built,and the electrolyzer parameters in the model are identified in combination with the proton exchange membrane electrolyzer mechanism model to obtain a voltage model that can accurately describe the operating characteristics of the proton exchange membrane electrolyzer.For the alkaline electrolyzer,an equivalent circuit model of the alkaline electrolyzer is constructed and simulated for the existing research.2.Research on the strategy of electrolytic water hydrogen production system to smooth out wind power fluctuations.Based on the output power characteristics of wind farms and the operating characteristics of the electrolytic water hydrogen production device,an electrolytic water hydrogen production system with a hybrid operation of a proton exchange membrane electrolyzer and an alkaline electrolyzer coupled to a wind farm is designed.Based on the requirement of grid-connected volatility limitation of wind farm output power,the volatility evaluation index based on fluctuating harmonic content is established.To achieve the volatility limitation target of the coupled operation system,two volatility power smoothing algorithms based on fuzzy parametric Kalman filtering and adaptive wavelet packet decomposition are proposed.The effectiveness of the two improved algorithms proposed in this thesis is demonstrated by simulating and analyzing the actual wind farm output power and comparing and evaluating the results using fluctuating harmonic content,and discusses the applicability of the two algorithms.3.The study on the optimal configuration of hybrid electrolytic water hydrogen production system considering economics.The economic evaluation indexes including electrolysis efficiency,initial input cost,operation cost and hydrogen production revenue are established.With the goal of optimal operation economy,an optimization model including two-layer synergy of capacity configuration and power allocation is established to investigate the impact of different electrolyzer capacity configurations on the economy.On this basis,an economic optimal configuration method based on differential evolutionary algorithm is proposed to determine the economic optimal capacity configuration scheme in the hybrid electrolytic water hydrogen production system.The three electrolyzer combination modes in the electrolytic water hydrogen production system are compared,and the advantages of the hybrid electrolytic water hydrogen production mode in smoothing the power fluctuation of wind farms compared with the single hydrogen production system in terms of smoothing effect and economics are verified.