The invention discloses an
offshore wind power frequency conversion gathering and sending control method, device and
system based on onshore integration, and belongs to the technical field of
power transmission and distribution of power systems, and the method comprises the steps: converting first AC
electric energy generated by an intermediate-frequency / power-frequency
wind power plant into first DC
electric energy through an offshore converter
station; the first direct-
current electric energy is transmitted to a land integration
station through a direct-current
submarine cable; second alternating-
current electric energy generated by the low-frequency
wind power plant is transmitted to the land integration
station through a low-frequency alternating-current
submarine cable; and converting the second alternating-
current electric energy into second direct-current
electric energy in the land integrated station, carrying out collection and
power frequency conversion on the first direct-current electric energy and the second direct-current electric energy, and transmitting
power frequency alternating-current electric energy obtained after conversion to a land
power grid. Therefore, by implementing the application, the problem that the electric energy cannot be transmitted at low cost due to the fact that it is difficult to directly send the electric energy of different frequencies out of the
system for topological combination in the prior art can be solved.