Study On Frequency Regulation Requirement And Energy Storage Benefit Evaluation Of Power System With Large Scale Wind Farm

In recent years,wind power as a typical clean and renewable energy resources in the eastern region of Heilongjiang,the rapid development of large-scale,has become an important support for the future power supply of the province.However,wind power output is typically stochastic and fluctuating,and it is also affected by such factors as uncoordinated power grid planning in the province,difficulties in regulating the peak load of large-scale systems with heat-supply units,and lack of delivery channels,after the large-scale wind power access,the frequency stability of the provincial power grid system decreases further.As an effective frequency modulation tool,energy storage technology can greatly improve the frequency stability of the grid when wind power is connected to the grid,therefore,it is of great engineering value to study the frequency modulation demand and energy storage benefit evaluation of power system with large-scale wind farm.In this paper,based on the actual operation of the Heilongjiang Power Grid,the economic and technical analysis and calculation of large-scale wind power and energy storage connected to the power grid are carried out.First,the frequency modulation demand capacity of large-scale wind power connected to Heilongjiang power grid is analyzed,combined with the actual operation data of Power Grid,the mechanism of active power output fluctuation and load fluctuation in wind farm is analyzed qualitatively and quantitatively,and the whole process of the influence of active power output fluctuation on frequency characteristics of power grid is studied,secondly,the frequency stability of large-scale wind power grid-connected system with energy storage is analyzed,and the frequency modulation control strategy of large-scale wind power grid-connected system with energy storage is studied,the Dynamic Response Model of energy storage system to wind power fluctuation is established,and the control strategy of energy storage system is designed to track the measured frequency of power system Finally,based on the utility evaluation of energy storage system dealing with high wind permeability power system frequency modulation demand,the key parameters of proportional control strategy for energy storage system are selected by using analytic hierarchy process,a comprehensive economic evaluation model considering the system investment,maintenance,electricity sales and environmental benefits is established,and the model is checked based on the operation conditions of different types of energy storage equipment.The simulation results show that,according to the principle of power supply and demand balance in the power grid,the system can effectively deal with the influence of wind power fluctuation based on the existing network source load structure,and the system frequency operation meets the requirements,with the increasing frequency modulation demand,the energy storage system can respond to the power fluctuation of the system quickly and effectively,and the efficiency of auxiliary frequency modulation is remarkable.