Start control method and device for offshore wind power through flexible direct current grid-connected system

Abstract

The invention discloses a starting control method and device for offshore wind power through a flexible direct-current grid-connected system, and relates to the technical field of offshore wind power direct-current output, uncontrolled charging is carried out on an offshore converter station and an onshore converter station, and when the voltage of each onshore sub-module and the voltage of each offshore sub-module are both larger than or equal to the corresponding first-stage voltage value, starting of the offshore wind power through the flexible direct-current grid-connected system is carried out. And when the voltage of each onshore sub-module and the voltage of each offshore sub-module are greater than or equal to the corresponding first-stage voltage value, carrying out controllable charging on the offshore converter station and the onshore converter station, and when the voltage of each onshore sub-module and the voltage of each offshore sub-module are greater than or equal to the corresponding second-stage voltage value, carrying out starting operation on the offshore converter station and the onshore converter station based on the voltage of each offshore sub-module and a preset direct-current oscillation suppression model. The technical problem that the reliability of an offshore wind power flexible direct current grid-connected system is reduced due to the fact that the existing starting control method only considers how to complete the establishment of the alternating current voltage of the flexible direct current offshore station through control and does not consider the influence of electrical quantity impact on equipment such as a flexible direct current converter valve in the starting process is solved.

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