Offshore Energy Hubs (OEHs) are emerging as a cornerstone for large-scale offshore wind integration, enabling multi-terminal HVDC transmission, cross-border power exchange, and enhanced operational flexibility. However, the high degree of converter-based generation introduces significant challenges during severe system disturbances. In particular, emergency events such as HVDC faults, converter blocking, or sudden transmission capacity constraints can lead to large and rapid increases in power imbalances that require coordinated, fast power reduction in connected offshore wind power plants (OWPPs).

This paper investigates the capability of existing energy dissipation hardware to safely absorb excess energy during fast power reduction events, such as Emergency Power Control (EPC) operation in OWPPs connected to OEHs. The study evaluates how surplus energy, from the mismatch between the machine-side input and the electrical output, is dissipated through the wind turbine (WT) DC-link choppers and Dynamic Braking Systems (DBS) are installed at the centralized level. Dynamic simulations are carried out in PSCAD using an average WT converter model combined with aggregated scaling and cable equivalents to represent the overall OWPP.

Simulation results quantify the energy dissipation limits for different EPC setpoints and WT ramp-down rates. The results show that WT DC-link choppers can accommodate full-scale EPC activation when high WT ramp-down rates are applied. For slower ramp-down rates, the

dissipated energy approaches or exceeds the chopper design limits, significantly reducing the available operational margin. The inclusion of a centrally located DBS, rated at 25% of the HVDC converter capacity, reduces the loading of individual WT DC choppers, enabling safe operation during large EPC events and improving overall system robustness.

Beyond the presented results, the paper provides a framework for assessing EPC performance in future HVDC-connected offshore systems and for examining the influence of WT converter control characteristics during emergency events. Differences between grid-following and grid-forming control philosophies may affect transient behavior, energy dissipation mechanisms, and interaction with OEH-level controls. Consideration of these effects under EPC conditions is

therefore identified as a critical next step toward defining robust grid code requirements for future offshore energy hubs.