Li WangTing-You LiChing-Chung TsengYaw-Juen WangHazlie Mokhlis0000-0001-9279-3818Kein Huat ChuaManoj TripathyShih-Chieh Hsu2025-10-292025-10-292025-05-1110.1109/ICPS64254.2025.11030367https://dspace-cris.utar.edu.my/handle/123456789/11617This paper analyzes the stability of a multi-terminal high-voltage direct current (MTHVDC) link based on a modular multilevel converter (MMC) to integrate an offshore wind farm (OWF) and an ocean thermal energy conversion system (OTECS) into two power grids. The results of small-signal stability of the studied system under different operational conditions are first examined. The damping controllers for the MMC to damp low-frequency oscillations of the studied system are designed using modal control theory. Dynamic responses of a nonlinear system model subject to a disturbance finally evaluate the damping controllers' performance. The simulation results show that the designed damping controller for the MMC of the MTHVDC can improve the stability of the studied system subject to different operating conditions and disturbances. © 2025 IEEE.endamping controllermodular multilevel convertermulti-terminal high-voltage direct currentocean thermal energy conversion systemoffshore wind farmstabilityControl system stabilityControl theoryConvergence of numerical methodsDampingElectric power system stabilityElectric power transmission networksElectric utilitiesEnergy conversionHVDC power transmissionOceanographyOffshore oil well productionPower convertersDamping controllersEnergy conversion systemsHigh-Voltage Direct CurrentModularsMulti terminalsMulti-terminal high-voltage direct currentMultilevel converterOcean thermal energiesOcean thermal energy conversion systemOffshore windsWind farmControllerstext::conference output::conference proceedings::conference paper