Grid-Connection Control and Simulation of PMSG ...

The technology of the high-voltage and high-power three-level converters are applied to the system of direct-drive wind power, and the converter structure is the dual three-level with back-to-back structure. The generation-side converter guarantees the point tracking of the maximum power and the smooth operating of the generator through the double-loop control scheme of the maximum ratio of torque to current. The grid-side converter adopts the vector control of grid voltage orientation, realizing the decoupling control of the active and reactive power. Meanwhile, the constant DC power can be ensured and the working state of the converter can be maintained in a unity power factor state. The simulation results show that the use of the dual three-level converter not only realizes the dynamic control of the system but also ensures the high quality of the electricity delivered to the grid.