Control of Offshore Wind Turbines Connected to Diode-Rectifier-Based HVdc Systems

Diode-rectifier-based high voltage dc (DR-HVdc) systems can be a promising low-cost solution for exporting wind power from remote offshore farms to onshore systems. Industrializing the DR-HVdc requires technical maturation, achievable through in-depth studies and pilot experiments. Deployment of may entail fundamental change control philosophy in turbine (WT) converters grid-following grid-forming. This article proposes new grid-forming DR-connected WT converters. The proposed controller uses two sequential loops regulate WTs' active power, maintain frequency ac network. first regulates active-power mismatch each into angle deviation, which leads change. second adjusts WT's alternating magnitude counteract An internal current loop is used limit fault eliminate high-frequency resonances system. verified by electromagnetic transient simulations, including fault-ride through, WTs change, reactive disturbance, outage.