输电线路输送容量动态增容研究

Study on dynamic control method for increasing transmission capacity of lines

在昌九一二线的线路改造过程中,将输送电压由10 kV升级为20 kV时,存在输送导线温度实时在线测量误差大和输送效率不高的问题.为解决这2个问题,提出了将光纤光栅测温技术运用到输电线路的在线测温上,并根据测得的输电线路内部和外部环境温度,建立了计算导线载流量的数学模型,得到导线能够承受的最大载流量.并将理论计算结果运用到昌九一二线的施工上,通过远程控制有载可调变压器和无功补偿装置,使线路运行负荷由700 A左右提高到1400 A,输送容量增加近一倍,同时这两条线路的供电能力在现有的基础上翻倍,超过原线路的额定值的50%.

In the capacity upgrade of the Nanchang-Jiujiang one and two line,the large errors of the real-time temperature measurements and increase transmission efficiency are the factors which influence the voltage transformation from 10 kV to 20 kV.To address the two problems,the temperature measurement technology is applied to the transmission lines by the optical fiber grating sense system.The temperature of the transmission line and its external environment is measured.The calculation model of dynamic capacity increasing is set up and the maximum carrying capacity is obtained by the temperature values.The results are applied to the Nanchang-Jiujiang one and two line construction.The obtained results show that the transmission capacity is improved from about 700 A to 1400 A,and can be nearly doubled by the remote control on-load adjustable transformer and reactive power compensation device.At the same time the power supply capability will be doubled and is more than 50%of the original line rating.