Power Transmission Congestion Management Based on Quasi-Dynamic Thermal Rating

Processes

Zhijie Yan¹  Zidan Sun²  Likai Liang²  Yanling Wang²  Fan Song²  Zhiqiang Niu³ 

[1] China Telecom, Nanjing 210000, China;School of Mechanical, Electrical and Information Engineering, Shandong University (Weihai), Weihai 264209, China;State Grid Weihai Power Supply Company, Weihai 264200, China;

关键词: transmission line;    meteorological parameter;    quasi-dynamic thermal rating (QDR);    transmission congestion;   

DOI  :  10.3390/pr7050244

来源: DOAJ

【 摘 要 】

Transmission congestion not only increases the operation risk, but also reduces the operation efficiency of power systems. Applying a quasi-dynamic thermal rating (QDR) to the transmission congestion alarm system can effectively alleviate transmission congestion. In this paper, according to the heat balance equation under the IEEE standard, a calculation method of QDR is proposed based on the threshold of meteorological parameters under 95% confidence level, which is determined by statistical analysis of seven-year meteorological data in Weihai, China. The QDR of transmission lines is calculated at different time scales. A transmission congestion management model based on QDR is established, and the transmission congestion alarm system including conductor temperature judgment is proposed. The case shows that transmission congestion management based on QDR is feasible, which improves the service life and operation flexibility of the power grid in emergencies and avoids power supply shortages caused by unnecessary trip protection.

【 授权许可】

Unknown