复杂结构输电线路接地短路及光纤复合架空地线电流计算

由于实际环境的影响和运行的需要等因素,电力系统输电线路结构越来越复杂。为了计算复杂情况下的光纤复合架空地线(OPGW)的故障电流,提出了基于线路交接点的扩展相分量法。根据线路的特点,将输电线路分割成若干个具有相同电气结构的区间;区间终端的电压源与其等效内阻抗由多端口戴维南等效电路求得;每个区间内建立统一的扩展相分量模型,以此来求解每个回路的电流。与传统的模型相比,所提方法更为全面地考虑了线路的电磁环境,并能解决复杂输电线路OPGW故障电流求解问题。

Analysis and Calculation of Fault Current for Optical-fiber Composite Overhead Ground Wire in Power System Fault of Complex Transmission Line

Owing to the actual environmental impact, operational requirements and other factors, the structure of power system transmission lines is complex. In order to calculate the fault current of optical-fiber composite overhead ground wire (OPGW) in these cases, a generalized phase component method is proposed based on the split point of transmission lines, which splits the transmission line into several intervals according to the characteristics of each line. Each interval of the transmission line has the same electrical structure, and the equivalent impedance and voltage source of the interval terminal can be obtained by the multi-port Thevenin equivalent circuit. To solve each loop current, a unified model of generalized phase component in each interval is developed. Compared with the traditional model, the proposed one is more comprehensive considering the electromagnetic environment of the transmission lines, and is effective in solving the problem of the fault current of OPGW for transmission lines with complex structures.