| In the face of energy shortage,ecological environJnent destruction,climate abnormality and other problems,all countries in the world are speeding up the pace of renewable energy utilization and development,and regard new energy technology as an indispensable part of the future development of key technologies.China's vast territory contains rich wind power resources.With the development of wind power technology,the cost of its power generation has been significantly reduced.In recent years,the installed capacity of wind power in China's power supply is increasing.But in the "Three North" area of our country,because of the wind heat conflict in the heating period,the phenomenon of wind abandonment is serious.Electric heating and battery energy storage technology is an effective way to reduce the abandoned wind.Among them,the relatively mature and stable electric heating technology can replace the output of some coal-fired units,improve the acceptance space of wind power,reduce the abandoned wind output,and improve environmental problems;The excellent bi-directional regulation of battery energy storage plays an important role in improving the stable and flexible operation of power grid.Due to the different technical characteristics of battery energy storage and heating with thermal energy storage,how to coordinate the operation mode of electric hybrid energy storage system and determine its optimal configuration according to the characteristics of abandoned air is the focus of current research.Firstly,this paper analyzes the mechanism of wind rejection in heating period,and puts forward the analysis method of wind rejection output characteristics;from the point of view of decoupling the rigid coupling relation of electric heating,this paper analyzes the electric heating device with heat storage and the battery energy storage device.Through quantitative analysis,this paper determines the characteristics of wind power output in heating,and the shortcomings of the current main electric heating methods in solving the problem of wind rejection and absorption.Then,considering the constraints of power system and thermal system,a thermal/electric hybrid energy storage system model is established.On the basis of considering the output characteristics of abandoned wind,the corresponding coordinated control strategy is proposed.In this paper,the typical scenarios of the whole heating period and the three periods before,during and after the heating period are taken as examples to compare the effect of absorbing and discarding wind under different operation control modes.So as to establish a reasonable control strategy basis for the capacity economic allocation of the thermal/electric hybrid energy storage system.Finally,the double-layer optirnization model is established by taking the economic benefits of the operation of the thermal/electric hybrid energy storage system and the optimal power distribution of the device as the objective fonction.On this basis,the fuzzy membership function is selected to solve the problem,and the results of conventional capacity allocation and capacity allocation supported by different policies are compared and analyzed to verify the effectiveness and feasibility of the proposed method.Then,the economy of the thermal/electric hybrid energy storage system is analyzed. |
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