基于双回路交直流同线输电方式的线路增容研究  

Study of capacity-increase for simultaneous AC-DC transmission based on double circuit AC transmission line

作　　者：柯广[1] 易灵芝[1] 周诗霞[2] 王书颢[1] 何东[1] 

机构地区：[1]湘潭大学信息工程学院,智能计算与信息处理教育部重点实验室,湖南湘潭411105 [2]中国地质大学机电学院,湖北武汉430074

出　　处：《电力系统保护与控制》2013年第6期25-31,共7页Power System Protection and Control

基　　金：湖南省自然科学基金(11JJ8004);湖南省教育厅(10A114;11ZD009;JG2011A012)

摘　　要：针对高压远距离输电最大输送功率主要受制于静态稳定性的特点,通过分析交直流同线输电系统输送功率和功角之间的关系,得出利用直流输电系统的快速可控性来应对负荷的扰动,可提高系统的稳定裕度,间接增加线路的输送容量;并讨论了两侧交流系统有效短路比和稳定性之间的关系。同时分析出在电压电流满足一定的规则条件下,无需改变现有线路结构在交流输电线路中注入直流实现交直流的同线传输,可大幅度地节省投资和运行成本。Matlab仿真实验验证了这一方案的可行性和有效性。The maximum transmission power of high voltage long distance transmission is mainly subjected to the static stability. Through analyzing the relationship between the transmission power and power angle, we find that using the fast control of DC components to respond to load disturbances can improve the stability margin of transmission system and expand the transmission capacity indirectly. In addition, the relationship between the effective short circuit ratio and stability of both sides of the AC system has also been discussed. It is found that there is no need to change the existing current circuit structure if DC components satisfy certain superposition rules. Consequently, the investment and operating cost have been drastically saved by the superposition of AC-DC transmission. Finally, Matlab simulations verify the the feasibility and validity of the scheme.

关 键 词：线路增容 Zigzag变压器 交直流同线输电 高压直流输电 直流偏磁 

分 类 号：TM721.1[电气工程—电力系统及自动化]