Research On Application Of Energy Storage Technology In Large-scale New Energy Integration

The production and life of modern society consumes a lot of energy.It is widely used in non-renewable energy sources such as petroleum,coal and natural gas.At the same time,it has brought serious environmental problems such as smog,acid rain,global warming and so on.Electric energy is one of the main energy sources in modern society.In the last century,it was mainly based on thermal power generation.With the rapid development of science and technology and the increasingly serious problems of environment,it is increasingly urgent to find new power generation technologies.Because wind energy is a kind of renewable and clean energy,wind energy is huge in the world.The development of wind power technology can solve environmental pollution well.Wind energy has gradually become a renewable energy that is universally valued worldwide.Due to the randomness of wind speed,the output power of wind power generation has strong randomness and volatility.When the output power of large-scale wind power is directly connected to the large power grid,the power fluctuation exceeds the specified requirements,which will adversely affect the power quality and the safe operation of the power grid.The energy storage system with a certain energy storage capacity for the wind farm can quickly absorb and release the power characteristics of the energy storage system,give full play to the advantages of different energy storage devices,which can well stabilize the wind power fluctuation in the large-scale wind power grid connection,so that the output power can meet the specified requirements.This paper mainly studies the following contents:(1)This paper introduces the background and significance of the research of this paper,and summarizes the research status of large-scale wind power grid-connected and energy storage technologies at home and abroad.The evaluation index of the volatility effect of wind power is given,and the necessity of introducing energy storage technology into the grid connection of large-scale wind power is analyzed.(2)Summarizes the classification and characteristics of current energy storage technology.The model of hybrid energy storage system is studied,and the calculation of rated power and capacity of the energy storage device is introduced in detail..(3)Combined with the characteristics of the battery and supercapacitor,a hybrid energy storage system combining battery and supercapacitor is proposed.The battery absorbs and releases the lower frequency part of the air release power,and the super capacitor absorbs and releases the higher frequency part of the flat wind power.An energy storage scheme based on wavelet analysis is proposed.Through the analysis of the example,the output power and energy conversion curves of the two are obtained,and the rated capacity and rated power of the two are calculated.Through comparative analysis,it is found that the hybrid energy storage system can make the system more economical than a single energy storage system.(4)In order to stabilize grid-connected power fluctuations,reduce the impact of large-scale wind power grid-connected on power systems,and reduce the costs of the construction and maintenance of power systems,this paper proposes a wind power stabilization strategy based on adaptive adjustment of fluctuation coefficients.According to the requirements of wind power grid-connected power fluctuation,the fluctuation coefficient is optimized,and the optimization model with the minimum energy storage capacity is designed.The sliding window and particle swarm are combined to solve the problem.The wind power grid-connected power value is obtained.