In the future

offshore wind farms are expected to use DC output wind turbines for networking to reduce cable costs and losses. For this reason

a multi-port wind power converter

used for realizing the DC output of large offshore wind turbines

is proposed. The converter uses a diode rectifier as a medium-voltage grid-connected port

and an energy storage port and a power-taking port for realizing the self-starting of the wind turbine. Without an LC filter on the output side

no capacitor will cause a discharge current impact on the short-circuit point when a DC short-circuit fault occurs. The control strategies including start-up

power generation

and fault ride-through are given. Moreover

based on the analysis of the boundary conditions of the key components

the parameter optimization method of its main circuit is proposed. An 8.0 MW DC output wind turbine model is constructed in PSCAD

the simulation results show that the converter operating parameters basically meet the boundary conditions

the startup process is smooth and there is no obvious impact. The converter can clear the DC short-circuit fault current in about 100 ms

protect the power components

and achieve fault ride-through. Finally

the hardware-in-the-loop simulation platform based on RT-LAB real-time simulator and F28335 controller is used to further verify the effectiveness of the converter startup and operation control strategy.