814 / 2019-04-29 18:11:00

Fault Ride-through of Fractional Frequency Offshore Wind Power System Based on Modular Multilevel Matrix Converter

droop control,fault ride-through,fractional frequency offshore wind power system,joint control,modular multilevel matrix converter

The fault ride-through (FRT) capacity has become an important grid requirement for fractional frequency offshore wind power system (FFOWPS) based on modular multilevel matrix converter (M3C). In this paper, a novel joint fault ride-through strategy is proposed, which employs a land grid voltage versus offshore grid frequency droop control on M3C. Then, the control system of wind turbines can adjust the generated active power and absorbed active power from wind at the same time based on the offshore grid frequency. Different form the previous research, the proposed joint control method can maintain the stability of the M3C DC capacitor voltage and the wind turbine rotor speed under the premise of satisfying the reactive power support to the grid under fault condition. Simulation results validate the fault ride-through capability of the FFOWPS in MATLAB/Simulink.