Offshore wind plant submarine cable transmission limit calculation method and device

The invention discloses a submarine cable transmission limit calculation method and equipment for an offshore wind farm, which are applied to an offshore wind farm alternating current sending-out system model, and the method comprises the following steps: setting the initial power P0 of a wind farm in a wind farm model; setting a power increasing step length delta P of the wind power plant, so that the power P of the wind power plant is linearly increased along the delta P; performing power simulation by using the offshore wind plant alternating current sending-out system model to obtain a power simulation result; judging whether the power simulation result meets a preset power constraint condition or not; if yes, the step of setting the power increasing step length delta P of the wind power plant is executed, so that the power P of the wind power plant is linearly increased along the delta P; and if not, determining the power transmission limit of the submarine cable of the offshore wind power plant accordin