Grid Forming $\mathcal{H}_{\infty}$ Control for HVDC Diode Rectifier-Connected Wind Power Plants

Grid forming controllers need to operate with a large variation of grid parameters and grid structures, for instance, during black-start operation, connection to HVDC diode rectifiers, etc. This paper proposes a methodology for the synthesis of robust grid forming controllers for HVDC diode rectifier based wind power plants using $\mathcal{H}_{\infty}$ control. The different operating modes of an HVDC diode rectifier based wind power plant should be considered for the controller synthesis using the proposed $\mathcal{H}_{\infty}$ controller design methodology. The proposed methodology for grid forming controller design improves the performance and robustness of well tuned standard proportional-resonant based controllers. The results have been validated experimentally at the wind turbine level by means of a small power prototype. The validation at the system level has been carried out using a realistic simulation of the HVDC diode rectifier-connected wind power plant.