| With the large-scale development of clean energy in China,due to the impact of power generation characteristics of clean energy on the stability of power grid and the disconnection between the vigorous development of clean energy and the construction of power grid,the problem of grid connection and consumption of clean energy in China is becoming increasingly serious.Based on the development characteristics of clean energy in China,aiming at the hydropower stations with small storage capacity,no regulation ability and large-scale single photovoltaic power stations without water and light complementary conditions and without external power supply,this paper proposes that the energy storage complementary hydropower station and photovoltaic power station can output the electric energy that cannot be absorbed locally,or realize the conversion from waste energy to hydrogen energy by hydrogen production system It provides a new route for the grid connection and consumption of electric energy.Based on the analysis of the characteristics of waste water and light in hydropower station and photovoltaic power station,the Optimization Research on energy storage system and hydrogen generation system of hydropower station and photovoltaic power station is carried out,and the optimal operation and power prediction error of energy storage hydrogen generation system of hydropower station and photovoltaic power station are studied,so as to solve the problem of waste energy of clean energy,promote the development and utilization of clean energy,and deepen the adjustment of energy It is of great significance to realize the great leap from traditional fossil energy to non fossil new energy.The main contents and conclusions of this paper include:First,in view of the serious situation of hydropower stations and photovoltaic power stations in China,the calculation method of power abandonment of hydropower stations and the long-distance transmission mode based on photovoltaic output characteristics are proposed.Taking the shaping II hydropower station in Sichuan Province and the 100MW photovoltaic demonstration base in Qinghai Province as examples,based on the calculation method of power abandonment of hydropower stations and the long-distance transmission mode of photovoltaic power stations,the multi time scale analysis on the characteristics of water photovoltaic power station abandonment is carried out.The results show that:shaping II hydropower station is subject to the fixed load command,and the storage capacity is small,and there is no regulation capacity,resulting in the hydropower station units can not be fully generated in the flood season,and the total annual power abandonment is 177 million k Wh;Under the"multi segment line"transmission mode,with the increase of the number of outgoing segments,the grid connected power of photovoltaic power station increases,and the abandoned power decreases:under the―seven segment‖transmission mode,the annual grid connected power of 100MW photovoltaic demonstration base is 170 million k Wh,which is 17.27%higher than that of―three segment‖transmission mode and 2.54%higher than that of―five segment‖mode.Second,in order to effectively solve the problem of grid connection and energy consumption caused by the large-scale construction of hydropower and photovoltaic power stations,this paper proposes the energy storage and complementary water photovoltaic station operation to realize the long-distance transmission of electric energy,and carries out the energy storage optimization research of abandoned water and light.According to the annual operation mode of the long-distance abandoned water storage system,the solar energy storage system is optimized according to the actual operation mode of the long-distance water storage system.Based on the influence of different charge discharge times and charge discharge depth on the life of energy storage battery,the capacity attenuation model of energy storage battery is constructed.Considering the influence of the life of the energy storage battery and the cost of the energy storage battery on the system economy,the whole life cycle economic index is taken as the evaluation index to optimize the capacity configuration of the energy storage system with abandoned water and light.The results show that:with the increase of energy storage capacity,the annual power abandonment rate of the system gradually decreases.When the energy storage battery with a capacity of30MWh is configured,the annual power abandonment rate of the 100MW demonstration base optical storage system is only 3.42%,and the annual newly added power transmission capacity of shaping II hydropower station is 126 million k Wh,and the annual utilization rate of power abandonment is 71.18%;According to the optimal allocation method of the capacity of the waste water and light system,according to the current energy storage battery unit price of 1600 yuan/k Wh,the optimal energy storage capacity of shaping II hydropower station and 100MW demonstration base are 1MWh and 5MWh,respectively,and the cost of electricity per kilowatt hour is 0.12 yuan/k Wh and 0.35 yuan/k Wh,respectively.Third,in order to meet the development needs of pure green energy in the future,based on the slow development of hydrogen production from renewable energy in China,the hydrogen production system is proposed to convert the electric energy that cannot be delivered by water Photovoltaic Station into efficient and clean energy carrier hydrogen,and carry out optimization research on hydrogen production system by discarding water and discarding light.Based on the characteristics of waste water and light,the power distribution and operation control of hydrogen production system from waste hydro and soalr enetgy were studied by gas and liquid storage and transportation.Taking the maximum net present value of the whole life cycle of the system as the optimization objective,the capacity optimization allocation models of the hydrogen production system from waste water and waste light were constructed respectively.The influence on hydrogen production system is discussed from three aspects:grid connection mode,hydrogen storage and transportation mode,and hydrogen transportation distance.The energy storage system and hydrogen production system with waste water and light are compared and analyzed from three aspects of power utilization rate,initial investment and life cycle net present value.The results show that:liquid hydrogen storage and transportation is more suitable for long-distance transportation of hydrogen.When the transportation distance is less than500km,the gas hydrogen storage and transportation mode is the best;when the transportation distance is greater than 500km,the storage and transportation mode of liquid hydrogen is the best;under the optimal operation scheme,the annual hydrogen production of hydrogen production system from waste water is 2.09×10~7Nm~3,and the utilization ratio of abandoned power is 70.54%,and the net present value of the whole life cycle is 199 million yuan;the annual grid connected electricity quantity of photo-hydrogen system is 166 million k Wh,the annual hydrogen production is7.01×10~6Nm~3,the annual utilization rate of electric energy is 91.77%,and the net present value of the whole life cycle is 123 million yuan.(4)Last,considering the utilization rate of electric energy and the economy of waste water and light energy storage hydrogen production system,the optimal operation of energy storage hydrogen production system of hydropower station and photovoltaic power station and the influence of power prediction error are studied.According to whether the hydropower station has the conditions of long-distance transmission and the different ways of photovoltaic energy consumption,the different operation modes of hydropower station and photovoltaic power station are proposed respectively.Based on different operation modes,a multi-objective optimization operation model of energy storage hydrogen production with waste water and light was constructed.Considering the influence of season type,weather mode and meteorological factors on photovoltaic power generation,an Elman neural network optical power prediction model based on similar day clustering and meteorological factor weighting method is constructed,and the influence of power prediction error on system operation is considered,so as to improve the controllability of energy storage hydrogen production system and realize the optimal economic benefit of the system.The results show that:under a certain capacity configuration,the optimal operation mode of hydropower station depends on whether the hydropower station has the conditions of long-distance transmission,the relationship between the increment of revenue brought by energy storage battery and the loss of energy storage battery;In any weather type,the energy storage complementary photovoltaic power station can simultaneously realize the long-distance output of electric energy and the conversion of hydrogen energy into the optimal operation scheme of photovoltaic energy storage hydrogen production system;The results show that the prediction accuracy of photovoltaic power under different weather modes can be improved by using the optical power prediction model.When the historical data is sufficient,the prediction error of photovoltaic power generation is less than 1%;Considering the uncertainty of prediction,when the prediction error of daily power generation is less than 1%,the range of daily grid connected electricity,daily hydrogen production and comprehensive benefit index is about±10%. |
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