Security constrained economic dispatch with dynamic thermal rating technology integration

Abstract

In traditional model for security constrained economic dispatch (SCED) decision, the limit on power transfer capability of overhead transmission line (OTL) is represented by its static thermal rating (STR) which incurs conservative constraints on OTLs' transfer limits which definitely causes conservative decision results. Comparing with STR, dynamic thermal rating (DTR) is an effective technique to improve the ampacity of OTL based on the monitoring of real-time environmental conditions including ambient temperature, solar radiation, wind speed and direction. Aiming to the issue mentioned above, in this paper, a SCED implementation framework is first designed with DTR technology integration, after that, on basis of the historical data gathered by DTR, a forecasting approach for thermal rating is proposed. Predict the environmental conditions along the overhead line using the exponential smoothing method first and then the forecasting of the DTR can be obtained. Then the benefits that delivered by utilizing the forecast thermal rating in SCED is analyzed via case studies. This paper explores an application pattern of DTR technology in SCED. It is capable of enhancing the power system security and economic performances by exploiting the potential transfer capability of OTLs.