| In recent years,as a large number of wind power and photovoltaic new energy are connected to the grid,the stability and security of the power grid are affected to varying degrees.Therefore,flywheel energy storage technology has gradually become a research hotspot in the power industry.The energy storage technology has the characteristics of fast charging and discharging,long service life,safety and environmental protection,which is very suitable for compensating the power frequency fluctuation with high frequency but low amplitude,and can meet the demand of large capacity,fast and accurate power parameter regulation,and has a very important significance for further improving the stability of power supply.Based on the combination of the flywheel energy storage system and the traditional battery energy storage system,the influence of the battery charge and discharge characteristics on the overall performance of the system was deeply analyzed and studied in this paper.First of all,through to the flywheel and the basic principle of battery and the typical topology analysis,and for both the advantages and disadvantages of power frequency adjustment when operated independently,in combination with the related physical properties of different kinds of battery,flywheel energy storage system is established and the general model of battery,effectively simulates the flywheel energy storage system with the actual working characteristics of different types of batteries,determines the basic control logic of the hybrid energy storage system.Second,according to physical properties related to the flywheel battery,the power balance and frequency stability as the main measure of overall system performance,voltage parameters of a module of hybrid energy storage system for reference,combining the traditional droop control theory,we design a real-time charged based on battery and flywheel State(State of Charge,SOC)improved droop control strategy.and is verified by MATLAB/Simulink,the control strategy according to the actual Charge and discharge rate of different batteries and the flywheel and the power automatically adjust the output level.Hybrid energy storage system relative to the traditional battery energy storage way,not only can effectively solve the imbalance caused by way of new energy power generation power and the problem of frequency offset,and give full play to the different ideal job characteristics,battery charging and discharging rate has better regulating effect and faster speed,and extend the actual service life of the battery.Finally,different power distribution methods are designed for flywheel energy storage system,battery energy storage system and hybrid energy storage system by establishing a relatively complete wind-photovoltaic microgrid simulation environment.Combined with the AGC adjustment command of the system and the deviation of frequency and power fluctuation caused by the system during operation,several groups of simulation experiments were carried out.Confirming the flywheel battery hybrid energy storage system in the process of adjusting,flexible play different load power and battery charge and discharge rate and flywheel work efficiency,the maximum guarantee regulation effect,quickly and effectively improve the due to a variety of new energy grid generation system can not bring down the disturbance problems quickly. |
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