双回耦合输电线路的零序参数在线测量

摘要

分析了双回耦合输电线路的结构,建立了其零序分布参数电路模型和“双Ⅱ形”零序集中参数电路模型;将增量法与“双Ⅱ形”电路相结合,提出了零序集中参数在线测量算法;推导了零序集中参数与分布参数间的转换关系,提出了零序分布参数在线测量算法;对不同长度的500 kV双回耦合输电线路进行仿真实验.仿真结果表明,所提出的电路模型及在线测量算法适用于电力系统的零序参数在线测量.%The structure of coupled double-circuit transmission line is analyzed and its circuit model of zerosequence distributed parameters and double-H-shaped circuit model of zero-sequence lumped parameters are built.By combining the increment method with the double-H-shaped circuit model,an algorithm is developed for the online measuring of zero-sequence lumped parameters.The conversion relationship between zero-sequence lumped parameters and distributed parameters is deduced,based on which,an algorithm is proposed for the online measuring of distributed parameters.Simulative experiments are carried out for 500 kV coupled double-circuit transmission line with different lengths.The simulative results show that the proposed circuit model and online measuring algorithms are applicable to the online measuring of power system zero-sequence parameters.