含调谐半波长输电线路继电保护关键问题研究

调谐半波长输电技术能够突破自然半波长输电线路其长度固定的缺陷，有望作为远距离大容量输电的重要方式，但因其长线路暂态过电压严重，加之调谐电路的接入导致线路视入阻抗非均匀变化，其电磁暂态特征与普通线路存在极大差异，现有线路保护原理、自动重合闸等保护控制方法难以适用。拟从长线路、杆塔、雷击电晕、潜供电弧、绝缘子闪络、快速接地开关动作等精细化建模入手，深入分析调谐半波长输电线路任意位置和故障工况下的波过程和电磁暂态特点；探讨调谐电路配置、分布对半波长输电线路运行特性及故障特性的影响，研究调谐电路最优配置方案；探索基于暂态量的调谐半波长输电线路继电保护新原理新算法，建立基于单端和多端数据的调谐半波长输电线路继电保护方案和动作逻辑；研究快速接地开关等过电压抑制措施造成的附加激励对线路电磁暂态过程的影响，提出适用于调谐半波长输电线路自动重合闸动作时序和逻辑。旨在突破调谐半波长输电线路继电保护关键技术。

Tuned half-wavelength transmission technology can break through the defect of fixed length of natural half-wavelength transmission lines and is expected to be an important way of long-distance and large-capacity transmission. However, due to the serious transient overvoltage of long-distance transmission lines and the non-uniform variation of line apparent impedance caused by the access of tuned circuits, its electromagnetic transient characteristics are quite different from those of ordinary transmission lines. Current line protection principles and automation Protection control methods such as reclosure are difficult to apply. It is proposed to start with the fine modeling of long lines, towers, lightning corona, latent power supply arc, insulator flashover, quick ground switch action and so on to deeply analyze the wave process and electromagnetic transient characteristics of tuned half-wavelength transmission lines at any position and under fault conditions. The influence of tuning circuit configuration and distribution on operating and fault characteristics of half-wavelength transmission lines is discussed. The optimal configuration scheme of tuning circuit is studied. The new principle and algorithm of tuned half-wavelength transmission line relay protection based on transient quantity are explored. A relay protection scheme and operation logic for tuned half-wavelength transmission lines based on single-terminal and multi-terminal data are established. This paper studies the effect of additional excitation caused by over-voltage suppression measures such as fast grounding switch on the electromagnetic transient process of the transmission line and proposes the timing sequence and logic of automatic reclosing for tuned half-wavelength transmission lines. The aim is to break through the key technology of relay protection of tuned half-wavelength transmission line.