Study On The Optimal Dispatching Strategy Of Power System Frequency Division And Complementary Considering The Uncertainty Of Wind Power Fluctuation

With the increasing proportion of wind power in the power system,the inherent random fluctuation and uncertainty of large-scale wind power clusters connected to the power grid bring challenges to the modern new energy power dispatching.In the high-proportion wind power access power system,the concept of power balance and reserve capacity needs to be changed from the thought of certainty changes into the thought of uncertainty.In this context,the traditional dispatching model and method is improved in essence to meet the new requirements of high proportion of wind power connected to the power system.At the same time,because wind power is hard to predict accurately,the multi-space and multi-time scale regulation method is not ideal in dealing with wind power randomness.Comparatively,the dispatching method based on frequency domain analysis is considered to be an effective technology in smoothing wind power fluctuations.In view of this,considering the uncertainty of wind power output,the multi-energy joint optimization of frequency division scheduling method at the frequency domain scale in this thesis be researched.The ma in research contents of this thesis are as follows:(1)Based on the study of frequency characteristics of various power generation modes,a new frequency division joint dispatching method is proposed,which can give play to different advantages of power g eneration.(2)A data-driven wind power uncertainty set is established.Firstly,the robust kernel density estimation methods that can calculate the probability density distribution of wind power are analyzed.Then the wind power uncertainty set is constructed according to the wind power probability density function obtained by the robust kernel density estimation method.(3)A two-stage robust optimal scheduling mathematical model for multi-energy frequency division is established,which allocates the requirement of reserve capacity of power system to each bands in proportion,and analyzes the regulating characteristics and dispatching cost of each bands.At the same time,the joint optimal dispatching algorithm is proposed to solve the model efficiently.Finally,the correctness and effectiveness of the model and method are verified by combining the optimization model in the CPLEX optimization software and the simulation software to build the node system model.