| Under the background of global warming and primary energy shortage,new energy power generation is of great significance to alleviate the shortage of fossil fuels and the transformation of energy structure.In the future,the proportion of new energy power generation will be increasing,and it is an inevitable trend to expand the installed scale of new energy power generation.However,at present,new energy power generation has shortcomings such as uncontrollable and unstable.Many research results show that the introduction of a long-term energy storage technology with low cost and large capacity plays an important role in improving the flexibility of the whole unit and reducing the rate of wind abandonment and light abandonment,which is also one of the mainstream development trends in the world.Firstly,this thesis summarizes the overall situation of new energy power generation and energy storage technology at home and abroad,analyzes the technical characteristics and application status of different energy storage,and selects tower photothermal power generation and double tank molten salt energy storage as the modeling basis according to the output characteristics of wind and solar resources.As an integrated system that integrates wind power generation,photothermal power generation,energy storage,and thermal power generation,it contains multiple domain knowledge,involves many system components,and the modeling work is complicated.In this thesis,a wind-solar complementary thermal power generation system model based on molten salt energy storage is constructed by using EBSILON software.Firstly,the feasibility of the model is verified.Secondly,the simulation analysis of the model is carried out,and the basic thermal economic parameters such as heat consumption rate and coal consumption rate and the heat loss parameters such as exergy value,exergy loss and exergy efficiency are studied.The research shows that compared with the traditional thermal power generation,the wind-solar-thermal-storage system can save 65,700 tons of coal in one year,reduce carbon dioxide emissions by 177,400 tons,reduce sulfur dioxide by 48,000 tons,reduce nitrogen oxide emissions by 5,500 tons,and increase green power by 215,000 MWh.The exergy efficiency of different components can be improved,up to 3.66%;finally,starting from the thermal economy of the system,the heat consumption rate,steam consumption rate and standard coal consumption rate of the system with energy storage device reach the lowest value.In addition,the whole system has the largest loss in the boiler part and has more energy saving space.The technical and economic evaluation of the example is carried out according to the leveling cost,internal rate of return and other indicators.The results show that the cost investment of light and heat part accounts for a large proportion of the whole unit investment,which is the main factor affecting the power generation cost.Although the introduction of energy storage part increases the investment cost,the power generation cost with heat storage system is 0.09 yuan/(k W·h)lower than that without heat storage system.The energy storage system can improve the power generation capacity and flexibility of the unit,improve the utilization rate of wind energy and light energy,and reduce the consumption of primary energy.It provides a solution for the problem of wind and light abandonment and energy conservation and emission reduction that are more concerned at home and abroad. |
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