Research On Integrated Energy System Of Wind And Solar Hydrogen Production In Off-grid Park With Multi-load

With the rapid development of the new energy,it is an inevitable choice for our country to achieve "carbon peak" and "carbon neutralization".The overall energy supply efficiency of traditional energy structure is low,and the environmental pollution is serious.Therefore,it is urgent to build a safe,efficient,low-carbon and environmental protection energy system.As an epitome of the Energy Internetconnection System,the park level integrated energy system contains a variety of energy forms.The energy supply,storage and energy conversion processes are highly coupled to realize efficient utilization of energy.This paper studies the integrated energy system of wind and photovoltaic hydrogen production in off-grid parks.On the energy supply side,wind energy,light energy and natural gas replace traditional fossil energy for power generation,and on the demand side,hydrogen energy storage replaces battery energy storage.The framework structure,configuration optimized and scheduling operation for the park level integrated energy system are studied,to improve energy efficiency and meet the needs of users with different loads.This paper firstly describes the development process and research status of the park level integrated energy system of wind and photovoltaic,and summarizes the typical structure of the integrated energy system.Based on the internal energy flow characteristics of the system,a comprehensive energy system for hydrogen production by wind and photovoltaic in off-grid parks suitable for multi-load is constructed.The applicable scenarios are proposed and evaluation indexes are selected,which provides a theoretical basis for the analysis and research of the capacity optimization configuration of the system in the following chapters.Secondly,according to the constructed comprehensive energy system framework of the park,the equipment in the system is divided into energy supply,energy storage and energy conversion equipment.The working principle and characteristics of each distributed unit are studied,and the mathematical model and MATLAB/Simulink simulation model of each equipment are established.The working environment and working characteristic curves of photovoltaic,wind turbine,electrolytic cell,cogeneration,and other equipment are analyzed and verified by simulation.Finally,the integrated energy system coupling simulation model is completed,which laid the model foundation for the subsequent research on the operation optimization and energy control of the integrated energy system.Then,aiming at the problem that the intermittency and uncertainty of wind and photovoltaic power generation affect the safe and stable operation of integrated energy system,a combined short-term power prediction algorithm is proposed.The combined prediction model of particle swarm optimization algorithm and long and short memory artificial neural network is constructed by using variational mode decomposition method for data preprocessing.The actual data of Chongli wind and photovoltaic hydrogen production demonstration project in Zhangjiakou City has verified that the combined model with a better prediction effect.The accurate prediction of the output power of wind turbine and photovoltaic is beneficial to the rational allocation of the output of each component of the system and the improvement of energy utilization rate.Finally,based on the load requirements and equipment parameters of the comprehensive energy system of hydrogen production by wind and photovoltaic in off-grid parks,hydrogen energy storage is proposed as a multi-energy conversion hub,and the optimal configuration model of comprehensive energy system in low-carbon parks is established,and the optimal planning scheme of typical days of energy system in different seasons is analyzed.Comparing with the traditional energy systems,it is verified that the park level integrated energy system of hydrogen produced by wind and photovoltaic configured with hydrogen energy storage is more economical and cleaner.