Grid-forming control strategy for PMSG wind turbines connected to the low-frequency AC transmission system

The inevitable consequence of the rapid transition to high-proportion renewable energy and high-proportion power electronics with the development of power systems is the loss of the traditional high-volume generation of synchronous generators, their inertia, and the accompanying frequency and voltage control mechanisms. This loss of moment of inertia changes the nature of the power system into a low inertia grid, which brings serious stability challenges. The new control technology of the converter promises to address these challenges and replicate the functionality provided so far by the synchronous generator. Firstly, the model of the low-frequency transmission wind turbine being integrated into the power grid is built. Secondly, a data-driven robust control strategy is designed for the machine-side inverter and the grid-side modular multilevel matrix converter (M3C), and the grid-forming control system of the wind turbine is established, so that the low-frequency transmission wind turbine can meet the grid-connection requirements. Finally, the real-time simulation experiment platform of the multi-fan collaborative control system is built. The experimental results verify the effectiveness of the grid-forming controller and the frequency stability of the grid-connected multiple fans.