Analysis on the DTR of Transmission Lines to Improve the Utilization of Wind Power

Abstract

The real-time meteorological data, especially wind speed, affects the thermal rating of the transmission elements and also determines the power generation capacity of the wind turbines. The dynamic thermal rating (DTR) technique can effectively tap the transmission capacity of existing transmission lines, which can improve the integration of wind power. Based on the IEEE standard thermal balance equation, corresponding to the 9-year meteorological data with 1 hour interval in Weihai, the dynamic thermal ratings of transmission line are calculated, which are much higher than static thermal rating(STR). The dynamic matching process between wind power and line transmission capacity is presented. The effect of DTR on increasing the number of wind power integration is researched. Then, the influence of current carrying, wind speed, and wind direction on line transient overload capacity is studied. The transient DTR is analyzed to improve the congestion management. Finally, the effects of DTR on acceptance of wind power and mitigation of power system congestion are analyzed by examples. The results show that DTR technology can effectively improve the utilization rate of wind power generation.