The Mathematical Modeling And Real-time Simulation Of Power Unit And Energy Storage System

With growing shares of variable,renewable electricity(VRE)generation in power systems,the power grid peak-valley gap is increasing greatly,energy system modeling become more diverse and challengeable,the influence of the modeling approach for thermal power plants on storage demand(i.e.storage expansion)and utilization,especially in highly renewable energy scenarios,has not yet been analyzed.Based above mentioned,it is very necessary to study the influence of dynamic characteristics of thermal power unit on energy storage system,through the mathematical modeling and simulation of thermal power plants and energy storage system,ultimately,the optimum power and capacity of the energy storage system is configuration in energy system.The influence on thermal power unit is also studied.In this article,choose a HG-1900/25.4-YM4 supercritical boiler and N600-24.2/571/571 supercritical once reheat condensing steam turbine based on 600 MW thermal power generating unit as the research object,established the mathematical model,based on MATLAB/Simulink simulation platform,Within the range of 35% to 100% BMCR,the thermodynamic property of boiler furnace,super-heater,turbine generator of thermal power plant was studied,and based on the thermal power unit forced outage rate and the available power network data,a Configuration study of the power and capacity of energy storage system conducted.The results indicate: in the study of variable conditions of thermal power units,with the boiler evaporation increase from 35% of the maximum continuous evaporation to 100%,the boiler calculated fuel consumption,the effective heat utilization of boiler,furnace heat radiation intensity gradually increased,the flue gas temperature at furnace outlet,the flue gas temperature and the steam temperature of superheater outlet gradually increased,the flue gas temperature of convection super heater outlet gradually tend to be stable,heat absorption of superheater increase gradually.With the intake of turbine steam increased from 35% full open(VOW)valve condition to 100%,the heat consumption rate of the first stage and the final stage of low pressure cylinder,intermediate pressure cylinder and high pressure cylinder of steam turbine is also gradually increased,the heat consumption of steam turbine gradually decreased,steam turbine machine power is increased.At rated conditions,with the flow direction the enthalpy drop of high-pressure cylinder,intermediate pressure cylinder and low pressure cylinder increase in turn,the enthalpy drop of low pressure cylinder accounted for 57.05% of whole turbine,In the configuration study of energy storage system power and capacity,according to LOLP computing method to configure the storage system,the LOLP parameter decreased by 99.52%,EENS parameter decreased by 99.05%,according to EENS computing method to configure the storage system,the LOLP parameter decreased by 99.25%,EENS parameter decreased by 98.53%.Compare the two configuration results,the discharge power configured 1.37 gigawatts according to LOLP more than discharge power configured according to EENS,the discharge capacity configured 4700 kilowatt-hours according to LOLP more than discharge capacity configured according to EENS,the configuration scheme configured according LOLP parameter would be more effective to improve the reliability of the power grid.