Offshore wind power output directly-buried submarine cable section optimization method based on dynamic load

The invention discloses an offshore wind power transmission direct-buried submarine cable section optimization method based on a dynamic load, and the method comprises the following steps: determining the rated transmission capacity of a wind power plant, and obtaining a dynamic load curve of the wind power plant considering the margin; primarily selecting a submarine cable section and a corresponding current-carrying capacity calculated value according to the rated transmission capacity of the wind power plant; establishing a stratified thermal circuit model of the directly-buried submarine cable, and calculating thermal resistance, thermal capacity and loss of each layer of the submarine cable and the surrounding soil environment; based on the dynamic load curve and the thermal circuit model, a finite difference method is adopted to solve a heat conduction partial differential equation of cable transient temperature response, and submarine cable temperature rise response is iteratively solved; and comparing