| Vigorously developing wind power generation is one of the important measures to realize the transformation of low-carbon energy.In the past decade,China's wind power development speed has attracted the world's attention.Since the end of 2013,China's accumulative installed capacity has ranked first in the world,and by 2020,the accumulative installed capacity has reached 281 million kilowatts.However,due to the volatility,intermittency and uncertainty of wind power,in the rapid development of wind power,there are problems such as the lack of flexible resources such as blocked delivery,insufficient peak regulation capacity,and frequent wind abandonment.Under China's climate goal of "30/60" in the future,wind power will still develop rapidly,and the imbalance between supply and demand of power system flexibility is becoming increasingly prominent.It will be difficult to rely only on conventional power units to provide flexibility.The inevitable choice to achieve the"carbon neutral" goal by 2060.Energy storage,with its ability to separate the production and consumption of electricity in time and space,is an important flexible resource to support future power systems with a high proportion of renewable energy.Due to the dual attribute switching between power supply and load and the flexible layout of energy storage,the relationship among power supply side,grid side and energy storage is close and complex,and the traditional power system planning method oriented to the series of power supply and grid,which is dominated by the conventional power supply,is no longer applicable.Therefore,the research on the coordinated planning method of source-storage-network to improve the flexibility of the power system with high wind power permeability has important theoretical significance and engineering practical value for supporting the safe and economic operation of the power system with high wind power permeability in the future.This paper aims at the safe and economic operation demands of the power system with high wind power penetration in the future and the flexibility resource demands of scenarios such as blocked wind power delivery and insufficient system flexibility.Conducted a passive response to abandon the wind storage-lose flexibility joint planning,take the initiative to fill the needs of the source-reservoir-net integration planning and give full consideration to energy storage efficiency,fully verified energy storage revenue source-reservoir-network coordination planning and a series of methods of research,can according to different stages in the development of wind power in the flexibility of the balance between supply and demand,realize the source-reservoir-network optimization as a whole,To achieve the lowest cost to achieve the maximum flexibility of the goal.The main work of this thesis is as follows:(1)Analysis of supply and demand relationship of flexible power system with multiple time scales.Flexibility abundance index and flexibility operation safety domain are proposed,and different operation scenarios of wind power permeability are obtained through trial and error by using measured wind power and load data of a northeast province grid.The influence of the operation mode of conventional wind power units on the supply and demand of flexibility,the probability distribution of daily permeability under different wind power permeability in annual time scale and the daily distribution law of flexibility abundant are analyzed.It is concluded that downscaling the starting mode of conventional units can alleviate the shortage of downscaling flexibility supply,but additional flexibility resources must be introduced to ensure the balance of flexibility supply and demand,which lays a theoretical foundation for the follow-up research on the coordination planning of source storage networks.(2)Because of the problem of wind abandonment caused by insufficient peak regulation and transmission congestion,a storage-transmission joint planning method is proposed to deal with the lack of flexibility and transmission congestion.Firstly,the coupling relationship between the power-duration characteristics and the timing sequence of the power transmission jam and the insufficient flexibility of wind abandonment events is analyzed.Then,the coupling relationship between the two kinds of wind abandonment events is used to obtain the total wind abandonment of the system,and the relationship between the transmission capacity and the total wind abandonment of the system is further analyzed by the perturbation transmission capacity.Finally,the use of wind power and network capacity and the system total wind relationship,build the total response to abandon the wind as the target store-losing a joint optimization model,the first change the wind and it is concluded that the total abandons the wind outlets boundaries,after cut abandons the optimization model of the wind energy storage configuration,ease to abandon the wind and improve the utilization ratio of energy storage and transmission engineering.(3)Under the premise of saving the wind electricity development in the future,it is proposed to actively deal with the system flexibility and the source-storage-network integration planning method for considering the balance of flexibility supply and demand is proposed.Exploring the interaction between an energy storage configuration and thermal power installed capacity in power supply planning,the effect of energy storage layout on the planning of the transmission network.On this basis,the source-storage network integration planning method considering the flexibility supply and demand balance is constructed.By the method of serialization of the traditional power supply,the grid serial sequence is compared,the source of the Garver6 system planning scheme is shown.Source considering the balance of flexibility.The integrated planning method of the storage network can solve the problem of the lack of flexibility in future wind power development,and achieve storage,power supply,and power grids coordinated planning,which in turn achieves optimal overall economy.(4)Aiming at the problems of the high cost of energy storage and low return on investment caused by a single application of energy storage in the planning process,a source-storage-transport joint planning method was constructed to take into account the comprehensive return of energy storage.Firstly,the income of the energy storage system is divided in detail from the planning level,and the accounting method of the income of the energy storage system is proposed.Secondly,according to the fluctuating trend of net load after wind power grid connection,two dynamic electricity pricing methods,namely power tripartite and time tripartite,are proposed to achieve the dual goals of direct profit from energy storage and improvement of system flexibility.Finally,a coordinated planning model of source-storage-network was constructed,which comprehensively considered the direct benefits of peak-valley arbitrage and the indirect benefits of the impact of energy storage configuration on the system.The effectiveness of the proposed method was verified through an example analysis,and it was also proved that comprehensive accounting of energy storage benefits was beneficial to cost recovery and system flexibility improvement. |
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