Anti-interference adaptive single-phase auto-reclosing schemes based on reactive power characteristics for transmission lines with shunt reactors

摘要

This paper proposes two anti-interference adaptive single-phase auto-reclosing (ASPAR) schemes for transmission lines with shunt reactors. This approach is based on faulty phase reactive power characteristics. Instantaneous power algorithm (IPA) is used to calculate the reactive power using voltage and current measurements at only one end of the transmission line. After fault extinction, faulty phase reactive power magnitude rapidly rises and can be divided into five frequency components, hence, magnitude and frequency components ratio are used to identify fault extinction time. Integral processes are included in IPA, for this reason, the proposed ASPAR schemes possess anti-interference capability, and it can be used on wind power outgoing lines with multiple kind of interference often. The proposed approach considers various transmission lines interferences: rapid transmit power fluctuation and external lightning strike. Influences of high frequency disturbance and wind power plants low voltage ride through (LVRT) process were also taken into account. The proposed ASPAR schemes is extensively investigated on a typical wind power outgoing line, Hami, Xinjiang, China via the simulation platform PSCAD/EMTDC 4.5.0.0. Different cases are studied considering rapid transmit power fluctuation and external lightning strike. The simulation results ensure the validity and feasibility of the proposed ASPAR schemes on transmission lines with and without much interference. Besides, the robustness of the proposed ASPAR schemes against varied fault location and transition resistance is also verified.