Frequency support control method and device for shore converter station

The invention discloses a frequency support control method and device for a shore converter station, and belongs to the technical field of high-voltage direct-current transmission, and the method comprises the steps: controlling the shore converter station to carry out the frequency support of constant coefficient inertia at a first stage when the frequency of a shore alternating-current power grid exceeds a threshold range, and controlling the frequency support of constant coefficient inertia at a second stage; when the frequency change rate corresponding to the shore alternating current power grid frequency has a wave crest, the shore converter station is controlled in the second stage to carry out optimal frequency support according to the current frequency change rate and an energy preset curve; according to the invention, multi-stage frequency support is carried out according to the change state of the frequency of the ashore AC power grid, and energy can be quickly and flexibly responded, released or ab