Robust Reserve Scheduling Method Considering The Active Power Control Of Wind Generators

Nowadays,due to the environmental pollution and the conventional energy crisis,wind power has been developing rapidly and played an important role in regulating energy structure.However,the variability,intermittency and uncertainty of wind power are also increasingly prominent,which increases the complexity of dispatching and the reserve pressure of traditional units.In recent years,with the development of wind generator technology,wind power’s frequency regulation and active power control is adopted to suppress the fluctuation of wind power output,reduce the reserve demand and improve the economic benefits of system operation.In this context,this dissertation takes the uncertainty of wind power output and the active control into consideration,and do a series of research on the economic scheduling.The main work of this dissertation can be summarized as follows:1)Typical de-loading control and the reserve capacity of wind generator for long time scale are investigated in detail.Several wind power dispatching methods on system level are briefly introduced and compared the problems in dealing with the large-scale wind power integration.Then,a dispatching method considered the wind-generator de-loading capability is proposed.2)A robust reserve scheduling method is proposed that can consider the uncertainty of wind power and load with the prediction error information given only,in which the de-loading control for wind turbine generator is introduced and the robust constraints include the wind farm reserve limits,the spinning reserve capacity are formulated.Furthermore,the robust model is transformed into a certainty problem based on the duality theory.Then a linear relaxation technology and the spatial branch-and-bound method are used to achieve the global optimum.Finally,simulation results of a modified IEEE 39-bus system with wind power integrated verify the effectiveness of the proposed method.3)In order to overcome the overly conservatism of the traditional robustness method in dealing with the uncertainty of wind power,a light robustness based dispatch model that can consider the uncertainty of wind power with the prediction error information given only is proposed,in which the ancillary frequency support from wind power is introduced and the constraints about the wind farm reserve limits and the conventional reserve limits are formulated.Finally,three methods including the nominal-scenario model,the conventional robust model and the proposed light robustness based model are systematically compared to validate the effectiveness of the proposed method,using a modified IEEE 30-bus system with wind power integrated.And the results show that the ancillary frequency regulation support can improve the feasibility of the scheduling scheme.Furthermore,the light robustness method is more economical than the traditional robust model.