基于FSC和TCSC混合复用的交直流混联线路潜供电弧特性

Analysis of Transient Characteristics of Secondary Arc in AC/DC Hybrid Transmission Line Based on FSC and TCSC Mixed Multiplexing

为提高系统运行稳定性,高补偿度串补装置广泛投入使用,但线路故障后潜供电流存在高幅值的低频分量,潜供电弧难以自熄。针对此问题,基于交直流混联输电线路,研究了不同布置方式下串补度对潜供电流与恢复电压幅值影响,提出了一种固定串补(fixed series compensation,FSC)和可控串补(thyristor controlled series compensation,TCSC)混合复用抑制潜供电弧的方法。此外,为满足线路对高补偿度的需求,设计FSC和TCSC混合复用串补度最佳配置方案。结果表明,交直流混联线路采用串补度40%的双平台分散布置方式,潜供电流与恢复电压幅值达到最小,燃弧时间最短。高补偿度串补线路TCSC采用串补度10%、20%的配置方案更利于熄弧,提高重合闸成功率。

In order to improve the stability of system operation,high compensation series compensation devices have been widely used.However,after a line fault,there are low-frequency components with high amplitude in the secondary arc current,making it difficult for the secondary arc to self extinguish.In response to this issue,the impact of series compensation on the amplitude of secondary arc current and recovery voltage were studied under different arrangements of AC/DC hybrid transmission lines,and a method of FSC and TCSC hybrid multiplexing was proposed to suppress secondary arc in this article.In addition,to meet the demand for high compensation degree in the line,the optimal configuration scheme for series compensation degree was designed with FSC and TCSC mixed multiplexing.The results show that a series compensation degree of 40%in a dual platform decentralized layout in the AC/DC hybrid transmission line,the minimum amplitude of the secondary arc current and recovery voltage are realized,and the shortest arcing time is also realized.In high compensation series compensation lines,when a configuration scheme with series compensation of 10%and 20%in the TCSC,it is more conducive to arc extinguishing and the success rate of reclosing.