Connection method for ultra high voltage direct current transmission, converter station and ultra high voltage direct current transmission system

摘要

Connection method for ultra high voltage direct current transmission, converter station and ultra high voltage direct current transmission system. The present invention relates to a connection method for uhvdc transmission, an uhv converter station and a unvdc transmission system. a uhv lv converter station on the rectifying side converts a first ac power into a first low voltage dc power and transfers it to a uhv hv converter station on the rectifying side. the uhv hv converter station on the rectifying side converts a second ac power to dc power and overlaps it with the first low voltage dc power to generate a first uhv dc power and transmits it to a reversing side uhv hv power station. the uhv hv converter station on the reverse side provides a third ac power and a second low voltage dc power, supplies the third ac power to a first load area, and transmits the second low voltage dc power to a uhv lv converter station on the inversion side, wherein the second low voltage dc energy is converted to a fourth ac power, which is supplied to a second load area. one or more uhv mv converter stations may be configured between the hv and lv converter stations on both the grinding and reversing side. the respective uhv mv converter stations are cascaded through the dc transmission line. The present invention employs a multi-point drop way to solve the poor safety problem of mains stability caused by feeding a large amount of energy through one point.