Design of a multi-time scale coordinated active power dispatching system for accommodating large scale wind power penetration

Large scale wind power has posed a great challenge for the power system dispatching mode and technology. By analyzing the characteristics of the predicting accuracy of wind power that increases level by level with different time scales and the inherent features of active power dispatch, a multi-time scale coordinated automatic power dispatching mode and its key technologies are proposed. In this mode, the deviations left over by the preceding level are corrected by the next level based on the idea of multi-level coordination, level by level refining. First, the framework and general idea of this system is described. Second, the methods of evaluating the generation trend are proposed including such problems as the ideal generation output model, extended short-term forecasting, ultra short-term forecasting and decomposition of the load curve. Third, the online rolling power scheduling model and its relationship with the day-ahead schedule, as well as the real-time power dispatching model using the waste wind minimum as the objective, and its relationship with the wind farm dispatch are presented. Finally, the application effects of an actual system are illustrated. © 2010 State Electric Power Research Institute Press.