Study On Primary Frequency Modulation Of Flywheel Energy Storage Array Nuclear Power Units

With the large-scale development of wind power,photovoltaic and other renewable energy sources,the power system’s frequency regulation capacity has significantly decreased,and the safety problem has become more serious.At the same time,the installed capacity of nuclear power units will continue to increase in the future,and the proportion of nuclear power in some provinces will exceed 30%.Based on the actual needs of the power grid,it is important to ensure the safe and stable operation of the power system by giving proper play to the primary frequency regulation capability of nuclear power units.Therefore,new technical means are urgently needed to improve the frequency regulation capacity of nuclear power units.Flywheel energy storage technology has developed rapidly in recent years,and its participation in frequency regulation has a very high frequency regulation performance,and its fast response speed is very suitable for frequent disturbances caused by the primary frequency regulation action,the flywheel energy storage will be used to assist the nuclear power unit primary frequency regulation can improve the nuclear power unit frequency regulation capacity,to ensure the safety of nuclear power units,and can improve the power system’s ability to consume renewable energy,and thus make more renewable energy The power system’s ability to consume renewable energy can be improved,thus enabling more renewable energy to be safely connected to the grid.Therefore,it is of great significance to study flywheel energy storage for primary frequency regulation of nuclear power units.In this paper,the following aspects of flywheel energy storage assisted primary frequency regulation of nuclear power units are studied:firstly,the primary frequency regulation principle and the primary frequency regulation mechanism of nuclear power units are analysed,the primary frequency regulation performance index of nuclear power units is explained,and the frequency regulation system model of nuclear power units and turbines is established based on Matlab/Simulink software.Then,a 1MW/250kWh flywheel energy storage system model is established,and the flywheel energy storage charging and discharging control characteristics are simulated and analysed,and the response characteristics of the flywheel energy storage are compared with those of lithiumion battery energy storage.Then,based on the particle filtering method,a flywheel energy storage array capacity allocation method is proposed with the objective of improving the primary FM integral power contribution index of a nuclear power unit by a factor of 2.Simulation experiments are conducted to verify the proposed flywheel energy storage array capacity allocation method based on the 12-hour historical data of a nuclear power unit,and a comparison is made with the capacity allocation method using the ensemble empirical modal decomposition method.Finally,the flywheel energy storage system is studied to assist the joint primary frequency regulation scheme of the nuclear power unit,and the difference between the primary frequency regulation command and the real-time output power of the nuclear power unit is used to set the flywheel energy storage array command.The control strategy.A joint primary frequency regulation model of the nuclear power unit and flywheel energy storage array is established using Matlab/Simulink software,and the effectiveness of the flywheel energy storage assisted primary frequency regulation of the nuclear power unit is verified through simulation experiments with step and continuous perturbations.