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 a HVDC diode rectifier based wind power plant are 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 a HVDC diode rectifier-connected wind power plant.