A Secure Dispatch Strategy Subject to the Uncertainties of DLR and Wind Power

The dynamic line rating (DLR) is recognized as an effective method to improve the integration of renewable energies, such as wind power by enhancing the flexibility of the system. The principle of DLR is to increase the transmission capacity of a transmission line according to the forecasted weather data. However, the uncertainties of DLR and wind power caused by the forecasting errors might bring in some severe consequences to the power system, such as line overloads. In this article, a tri-level preventive dispatch model is proposed to deal with this issue. To reduce the conservativeness of the solution, the density-based spatial clustering of application with noise method is employed to identify and remove the extreme scenarios of DLR. And a decomposition method is proposed to solve the tri-level model. In particular, a fast solution method by identifying the high-risk lines is also presented to obtain the optimal solution quickly. The numerical simulations on several IEEE bus systems demonstrate the effectiveness of the proposed model.