Control of HVDC Supergrids

This paper compares different HVDC grid control strategies in two grid configurations, specifically constant voltage and power-droop control with and without a deadband, and identifies the most suitable method. The original model was a point-to-point (p2p) system with one grid converter and another converter connected to a wind farm modeled as an AC source. That model was then developed into a three-terminal system with two offshore wind farms modeled as AC sources. It was then investigated how the expanded grid operated with its control variables taken from the p2p model and vice versa. It was concluded that it was possible to implement the control variables optimized for the expanded system in both the p2p and expanded model with mostly the same overshoot behavior across the control methods. Droop control outperforms constant voltage control.