  The increasing integration of renewable energy resources in evolving bulk
power system (BPS) is impacting the system inertia. Type-5 wind turbine
generation has the potential to behave like a traditional synchronous generator
and can help improve system inertia. Hydraulic torque converter (TC) and
gearbox with torque limiting feature are integral parts of a Type-5 wind
turbine unit. High fidelity model of Type-5 wind turbine including these core
components is not openly and widely available for grid integration and
transient stability studies. This hinders appropriate assessment of Type-5 wind
power plant's contribution to bulk grid resilience. This work develops a TC
model based on those generally used in automobile's transmission system.
Moreover, the concept of torsional coupling is leveraged to integrate the TC
and gearbox system dynamics. The entire integrated model will be open sourced
and publicly available for grid integration studies.
