局部耦合双回输电线路故障测距时域算法

Fault location algorithm based on time-domain for partial coupling double-circuit transmission lines

多回耦合输电方式是电网建设的必然趋势,以局部耦合多回线路为主。受线间局部耦合影响,现有故障测距方法存在较大误差。为此,对局部耦合双回输电线路开展故障分析和故障测距方法研究。根据局部耦合同塔双回输电线路的结构和特点,利用线路解耦理论建立局部耦合双回输电线路耦合分界点处的电压和电流接口方程。在此基础上,构建各耦合段的故障测距时域分析模型,从而提出局部耦合双回输电线路的故障测距时域方法。最后,利用ATP/EMTP电磁暂态仿真软件构建局部耦合同塔双回输电线路模型,并进行全面的仿真验证,结果表明所提方法精度高。

Multi-circuit transmission lines on the same tower have become the inevitable trend of power grid construction, mostly partial coupling mode. Affected by the partial coupling characteristics, the existing fault location methods have large error. Therefore, this paper develops a study about the fault analysis and fault location method for the partial decoupling double-circuit transmission lines. Based on its structure and characteristics, as well as the lines decoupting theory, the interface equations of demarcation point are built. On the basis of the above study, the new fault location algorithm based on time-domain for partial coupling double-circuit transmission lines are presented. Finally, ATP/EMTP is used to construct the model of partial coupling of double-circuit transmission lines. After the overall simulation and verification, it shows that the presented algorithm is accurate.