Integrated Energy System Modeling And Frequency Modulation Simulation Analysis

With the urgent need of the world energy production and consumption revolution,the integrated energy system,as a new energy system with high efficiency,multi-function complementation and cascade utilization,has been rapidly developed and widely studied by scholars in recent years.In this paper,the integrated energy system with gas turbine CCHP as the core is taken as the research object.Modeling and FM simulation are carried out to solve some problems in the study of integrated energy systems.In this paper,the characteristics of components are analyzed by the simulation model of integrated energy system,and the frequency modulation capability of the integrated energy system is simulated and analyzed.First of all,this paper establishes a comprehensive energy system simulation model with many components,including: "two drag one" gas-steam combined cycle system simulation model,ground source heat pump unit,lithium bromide absorption heat pump,photovoltaic power generation system,wind power generation system,battery energy storage system model.These modular models can be used to build the simulation platform of integrated energy system and provide support for analysis and simulation experiments.In addition,the simulation models of many components of the integrated energy system are analyzed one by one,and a series of component characteristics and analysis conclusions are obtained.Aiming at the problem of new energy consumption,the frequency modulation of integrated energy system is studied.The fluctuation characteristics of the renewable energy in the integrated energy system are analyzed,which are decomposed into short-term second random component and lasting minute variable component.Then,based on the existing simulation model,a series of simulation analyses of primary frequency modulation are carried out for the short-term random component.The primary FM capability of the integrated energy system is evaluated,and an optimization algorithm is designed to stabilize the primary FM capability.The influence of energy storage on the performance of primary frequency modulation(LFM)is analyzed,and then a scheme of the integrated energy system is proposed to calm the fluctuation of the wind and the wind.The simulation results show that the proposed scheme is effective in suppressing the short-term random components of new energy,and the energy storage can effectively improve the primary FM capability of the system.The secondary frequency modulation of integrated energy system is studied.The renewable energy component of the integrated energy system is analyzed,and the statistical analysis shows that it is normally distributed.A series of secondary frequency modulation simulation analysis is performed to evaluate the secondary frequency modulation capability of the system.According to the analysis results of new energy fluctuation rate and the variable load rate of the system,a scheme of the integrated energy system to calm the wind and wind fluctuation is proposed,and finally the simulation is carried out.Simulation results show that the proposed scheme combined with the former scheme is effective in calming the fluctuation of new energy.The combination of the two can make the network frequency meet the stability requirement.