HIGH-FREQUENCY IMPEDANCE MODEL OF MODULAR MULTILEVEL CONVERTER FOR HIGHFREQUENCY RESONANCE ANALYSIS

The high-voltage dc (HVDC) transmission is preferred for grid-integration of large-scale long-distance offshore wind farms and practical projects based on the modular multilevel converter (MMC) for wind farms have been globally put into operation or under construction. However, the high-frequency resonance (HFR) phenomena have frequently happened in the MMCHVDC projects in recent years, e.g., 1271...