Investigating Implications of Offshore Wind Farm Connections Regarding Harmonic Distortion

The Republic of Ireland (RoI) is expected to connect at least 5 GW of offshore wind by the 2030-2035 timeframe, largely using the long HVAC subsea cable technology. This introduces some familiar design challenges including issues related to insulation coordination, potential control interactions, and prioritizes the need for power‑quality assurance and harmonic compliance across the offshore and onshore transmission systems. This paper develops and applies a coordinated harmonics assessment and mitigation framework for the Irish offshore wind farm (OWF) connections, targeting compliance both at onshore Grid Interface Points