The invention discloses a multi-terminal DC (
Direct Current)
power transmission system for combined synchronization of a
wind power plant and a conventional power
plant. The multi-terminal DC
power transmission system comprises two rectification stations and an inversion
station, wherein the
wind power plant is connected to an AC (
Alternating Current)
bus side of one rectification
station, the conventional power plant is connected to an AC
bus side of the other rectification
station, the inversion station is connected to a load center, DC buses of the two rectification stations, corresponding to the inversion station, are connected together by a DC
power transmission line, thus the multi-terminal DC power
transmission system is formed. According to the multi-terminal DC power
transmission system disclosed by the invention, a matched conventional power plant does not need to be built near the
wind power plant, and the multi-terminal DC power
transmission system has no any requirements on a geographic position of the conventional power plant combined with the wind power plant; compared with a manner of
AC power grid synchronization, the multi-terminal DC power transmission
system does not need a local
AC power grid near the wind power plant to level the
power fluctuation of wind power; and compared with a scheme of synchronization of wind power plant through
voltage source type DC power transmission, the multi-terminal DC power transmission system can enable the
electricity transmission power of a single-circuit bipolar line to be 6,400MW or more by adopting the traditional mature ultra-high-
voltage current conversion technology.