Research On Planning,Operation And Cost-benefit Model Of Wind-Solar-Storage Complementary Power System

With the rapid development of renewable energy,renewable energy sources such as wind and solar power are playing an increasingly important role in the power system.However,renewable energy generation is faced with strong volatility and instability,which poses a great challenge to the stable operation of the power grid.At present,although power grid enterprises have taken a series of dispatching measures to improve the stability of the power system after the renewable energy is connected to the power grid,the market-oriented service mechanism in the power market is still difficult to establish in a short time,and the absorption of renewable energy in the actual operation is still a serious problem.With the continuous improvement of the economy of energy storage technology,the connection of energy storage devices has become an important means to regulate the power supply and demand,improve the stability of the power system,and promote the efficient consumption of renewable energy.Therefore,this paper considers the combination of three technologies of wind-solar-storage,and based on the characteristics of wind-solar-storage complementary power system,studies the site selection,planning and operation of the wind-solar-storage complementary power system to improve its economy,so as to solve the bottleneck in the development of renewable energy consumption such as scenery.The main research contents of this paper are as follows:Firstly,the development status,opportunities and challenges,and key technologies of wind-light-storage complementary power system are studied.From the macro policy point of view,there is a good policy environment for the development of wind,solar and storage complementary power system at present.The state has given policy support to the wind,solar and energy storage industries from the aspects of industrial subsidies,price mechanism,taxation and market construction.However,due to the high cost of investment,there are shortcomings in the overall economy.At the present stage,the key technologies of wind-solar-storage complementary power system include site selection and capacity determination technology,operation decision-making technology and economic evaluation technology.Based on the key technologies,this paper proposes the frame structure of wind-solar-storage complementary power system.Secondly,the location model of wind-solar-storage complementary system is studied.Based on the spatial analysis and the analysis of the differences and complementarities of energy technologies,the principle of site selection was clarified.In the principle of infrastructure site selection,the multi-objective site selection model of wind-solar-storage power system was constructed by considering the complementary characteristics of various energy sources as well as economic,technological,environmental and social objectives.The grey relational degree method is used to determine the correlation relation and index weight of each index,and then the optimal site selection scheme is obtained according to the multi-objective site selection model.An example shows that the proposed site selection model can balance multiple targets and optimize the site selection decision.Thirdly,on the basis of site selection optimization,the capacity coordination planning of wind-light-storage complementary power system is studied.Considering the power generation constraint,energy storage operation constraint,power balance constraint and renewable energy consumption constraint of each unit,the capacity coordination and optimization planning model of wind-solar-storage complementary power system was constructed.Based on the OPSO-chebyshev-TSSM model,the time series of wind power and photovoltaic power generation were constructed,and the optimization model was solved under given boundary conditions.Based on a demonstration system,a case study is carried out,which shows that the proposed planning model can reduce investment cost and wind and solar abandonment,and the rationality and accuracy of the proposed model are verified.Fourth,in the context of day-ahead electricity market bidding,considering the uncertainty of electricity market price and the uncertainty of wind power generation and photovoltaic power generation,the two-stage stochastic programming method was constructed to build the operation decision model of wind-solar-storage complementary power system with the goal of maximizing the interests of system operators.According to the calculation results,this optimization method is to reduce some bidding power in the day-ahead market and reduce energy imbalance to increase revenue.Finally,the whole life-cycle theory is used to analyze the technology and economy of the wind-solar-storage system,and the profit of the wind-solar-storage system is studied.The cost model of wind-light-storage complementary system including investment,operation,maintenance,failure and abandonment costs was established,and the profitability of wind-light-storage power system was analyzed by using indexes such as financial internal rate of return(irr),financial net present value(NPV)and investment payback period.Taking the construction project of wind-solar-storage and multi-energy complementary new energy generation system as an example,the risk prevention and control strategies and development suggestions are put forward based on the development of multi-energy complementary system in China.