基于纵向阻抗的混合双极直流输电线路保护新原理  

New Principle of Hybrid Bipolar DC Transmission Line Protection Based on Longitudinal Impedance

作　　者：高淑萍[1] 朱航舰 叶换飞 张保会[2] 宋国兵[2] GAO Shu-ping;ZHU Hang-jian;YE Huan-fei;ZHANG Bao-hui;SONG Guo-bing(Xi'an University of Science and Technology , Xi’an 710054, China;School of Electrical Engineering, Xi'an Jiaotong University , Xi'an 710049, China)

机构地区：[1]西安科技大学电气与控制工程学院,西安710054 [2]西安交通大学电气工程学院,西安710049

出　　处：《科学技术与工程》2019年第14期193-200,共8页Science Technology and Engineering

基　　金：国家自然科学基金(51777166);国家自然科学基金联合基金重点支持项目(U1766209)资助

摘　　要：由于传统高压直流输电和柔性直流输电有各自的优缺点,为了充分发挥二者的优势,混合直流输电成为研究的热点。对由传统高压直流输电和柔性直流输电构成的混合双极直流输电线路的保护原理开展了研究,将阻抗的概念进行扩展延伸,提出了一种基于整流侧和逆变侧纵向阻抗的故障保护原理,利用PSCAD搭建仿真模型,利用MATLAB进行算法的仿真验证,该纵向阻抗是整流侧和逆变侧两端电压故障分量的差与电流故障分量的和的比值,利用纵向阻抗的幅值来区分区内外故障。区内故障时,纵向阻抗的幅值小于该极线路全长总阻抗;区外故障时,纵向阻抗的幅值大于该极线路全长总阻抗。该保护可以自行实现故障选极,故障极的纵向阻抗幅值小于整定值,非故障极的纵向阻抗幅值大于整定值。大量的仿真结果验证了所提保护原理的正确性,并可以实现故障选极。Because of their own advantages and disadvantages of traditional high-voltage direct current(HVDC)transmission and flexible HVDC transmission,in order to give full play to their advantages,hybrid HVDC transmission has been become a research hotspot. The protection principle of hybrid bipolar DC transmission lines consisting of traditional HVDC transmission and flexible HVDC transmission was studied. Simulation modeling was put up with PSCAD,protection algorithm was carried out with MATLAB. It indicates that the concept of impedance is extended,and a fault protection principle based on the longitudinal impedance of the rectifier side and the inverter side is proposed. The longitudinal impedance is the ratio of the difference between the transient voltage across the rectifier side and the inverter side and the sum of the transient currents. The amplitude of longitudinal impedance is used to distinguish the internal and external faults. The amplitude of the longitudinal impedance is less than the setting value when the fault is internal fault;the amplitude of the longitudinal impedance is greater than the setting value when the fault is external fault. The fault selection pole can be self-actualized,the amplitude of longitudinal impedance of the fault pole is less than the setting value,and the amplitude of longitudinal impedance of the non-fault pole is greater than the setting value. The proposed protection principle is correct,and fault pole selection can be achieved.

关 键 词：混合双极直流输电系统 继电保护 纵向阻抗 暂态分量 

分 类 号：TM773[电气工程—电力系统及自动化]