Study On Operation Strategy Of Power System With Storage Considering Wind And Wind Uncertainty

Due to the random,intermittent and fluctuating characteristics of wind power and photovoltaic output,the increase of its penetration rate will adversely affect the safe and reliable operation of the power grid.The thermal power unit’s power adjustment speed is slow,and there is a minimum output constraint.It is difficult to adjust the power fluctuation caused by new energy based on the thermal power unit alone,which will cause severe abandonment.Energy storage has good power regulation capabilities,can increase the flexibility of the power system,and can be used to solve the problem of large-scale new energy grid connection and consumption.In this context,this thesis takes centralized energy storage as the research object.In order to give full play to the power regulating role of energy storage,the quantitative assessment of the reserve capacity of centralized energy storage is carried out,and for systems with low and high penetration of new energy,corresponding optimization scheduling strategies are proposed respectively,and the specific work is as follows:Firstly,a reserve frame model is established.The definition,source,and classification of reserve are analyzed in the model.The objects of energy storage,hydropower,thermal power,wind power,and photovoltaic are studied separately,and the power characteristic models of each object are established.Secondly,considering the constraints of centralized energy storage power and electricity,the concept of feasible area for centralized energy storage operation is proposed,and based on this concept,a quantitative method for evaluating the real-time operation reserve capacity of centralized energy storage under the power generation(use)plan is further given.Based on actual grid data,the effects of parameters such as the expected range of energy storage capacity,electricity / capacity ratio,and reserve contract on reserve capacity are analyzed.Then,with the minimum operating cost of the system as the objective function,the spinning reserve is configured according to the fixed load proportion.An optimization model of the power storage system with a fixed constraint method is established,and the quantitative assessment method of the energy reserve capacity proposed in Chapter 3 is further used.Analyzing the energy storage reserve on the basis of the established peak shaving strategy can add flexibility to the grid.Finally,instead of directly setting a fixed reserve capacity constraint,the concept of value-at-risk was introduced.Aimed at the goal of minimizing the total cost of system risk,a scheduling optimization method for power systems with storage under the risk scheduling method was proposed.Simulations show that the method has a good adaptability.