半波长交流输电线路保护方案及装置研制  

Protection Scheme and Device Development for Half-wavelength AC Transmission Lines

作　　者：吴通华 洪丰[2] 郑玉平[1,3] 柳焕章 林湘宁[5] 王兴国 WU Tonghua;HONG Feng;ZHENG Yuping;LIU Huanzhang;LIN Xiangning;WANG Xingguo(State Key Laboratory of Smart Grid Protection and Control, Nanjing 211106, China;NARI Technology Co. Ltd., Nanjing 211106, China;College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China;Central China Branch of State Grid Corporation of China, Wuhan 430077, China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology （Huazhong University of Science and Technology）, Wuhan 430074, China;China Electric Power Research Institute, Beijing 100192, China)

机构地区：[1]智能电网保护和运行控制国家重点实验室,江苏省南京市211106 [2]国电南瑞科技股份有限公司,江苏省南京市211106 [3]河海大学能源与电气学院,江苏省南京市210098 [4]国家电网公司华中分部,湖北省武汉市430077 [5]强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074 [6]中国电力科学研究院,北京市100192

出　　处：《电力系统自动化》2017年第24期142-149,共8页Automation of Electric Power Systems

基　　金：国家电网公司科技项目"半波长交流输电继电保护理论关键技术研究"~~

摘　　要：半波长线路输电距离远,故障特征与常规输电线路差异显著。针对半波长线路对保护带来的挑战,基于自由波能量保护、同步差动阻抗保护和假同步差动阻抗保护等半波长保护原理,设计了实用的半波长线路保护方案,确保近端故障单端量保护快速动作,远端故障双端量保护全线速动。针对半波长线路保护算法复杂、计算量大、采样率要求高、纵联通道延时长等难题,设计了基于中央处理器+双数字信号处理器(CPU+双DSP)的系统构架,提出了保护逻辑分处理器及分调度周期处理、假同步差动阻抗保护采样数据回退处理等关键技术,形成完整的半波长线路保护装置软硬件实现方案。经实时数字仿真(RTDS)试验和动模试验验证,所研制保护装置各项动作行为、性能指标均满足半波长输电线路安全运行要求。The fault characteristics of half-wavelength transmission line with long transmission distance are significantly different from those of conventional ones. To meet the challenge, a practical protection scheme of half-wavelength transmission line is designed based on the principle of half-wavelength protection such as free wave energy protection, synchronous differential impedance protection, false synchronous differential impedance protection, etc. The proposed scheme forms a system that the single terminal protection clears the near-terminal fault with high speed operation and the remote two-terminal protection achieve rapid fault clearing for whole lines. Since the half-wavelength transmission line protection algorithm has the disadvantages of complex, large amount of calculation, high sampling rate and long channel delay, several key technologies are proposed such as hardware architecture based on CPU and double-DSP, split core processing and split dispatching cycle processing of protection logic and rollback mechanism of false synchronous differential impedance protection sampled data. The complete protection implementation scheme of half-wavelength transmission line protection is formed. At last, the real time digital simulation （RTDS） test and dynamic simulations prove that the protective action and performance index meet all the safety operation requirements of half-wavelength transmission line.

关 键 词：半波长线路 自由波能量保护 差动阻抗保护 假同步 回退机制 通道延时 

分 类 号：TM773[电气工程—电力系统及自动化]