| In recent years,the installed capacity of wind power in China has increased rapidly and has become the second largest clean energy after hydropower.With the proposal of the “Double Carbon” strategic goal in 2020,the installed capacity of wind power is bound to continue to grow in a blowout manner.However,affected by the uneven distribution of wind energy resources in China,the main installed capacity of wind power is inversely distributed with the central provinces of load demand in coastal areas.In addition,wind power has inherent characteristics such as strong uncertainty,volatility and inverse peak regulation,which make the consumption of large-scale wind power a big problem.Aiming at the problem of large-scale wind power consumption,with the help of the good regulation performance of pumped-storage hydropower plant(PSHP),this paper studies the cross-regional integrated transmission of PSHP and wind farm(WF),so as to improve the utilization rate of wind power.The main contents of the paper include the following parts:(1)A scenario analysis method of wind power uncertainty based on kernel density estimation is proposed.Considering the aggregation effect of WFs in the same area,multiple WFs are integrated into a virtual WF,and their uncertainty is comprehensively considered.The kernel density estimation is used to fit the historical prediction error data of the WF to obtain the probability density function of each period.Then,the median Latin hypercube sampling and Synchronous backstepping technology based on probability distance are used to generate and reduce the scene.Finally,a small number of representative wind power prediction deviation scenes are obtained,which are verified by three WFs located in the same area of province A in Western China.(2)The cross-regional peak shaving optimal dispatching model of WF-PSHP union is established.The model takes the maximum power generation benefit of the union as the optimization objective,and adds peak shaving constraint to the model,so that the receiving-end power grid can absorb large-scale wind power and alleviate its own peak shaving pressure at the same time.In order to ensure the accuracy of dispatching,the model takes the units of PSHP as the basic dispatching unit,considers various hydraulic constraints and unit constraints,and transforms the original model into an mixed integer-linear programming(MILP)problem through linearization technology,and uses the mathematical solver LINGO to solve the model.The simulation dispatching is carried out with an actual PSHP in province A and the virtual WF integrated above.The results show that the standard deviation of residual load are significantly reduced after the receiving-end power grid absorbs large-scale wind power,which proves the effectiveness of the model.(3)The benefit allocation mode based on Shapley value method and Nucleolus solution is adopted to allocation the benefit of WF-PSHP union.Considering the power generation benefits and cooperation enthusiasm of each power plant,the power generation benefits of the union obtained by the previous model are allocated among each power plant.The example calculation shows that the benefits of each power plant in the union are greater than they operate alone,especially the growth of PSHP is the most obvious,provide good support for the cooperation between PSHP and WFs. |
