Improved Synergetic Control in Multi-Terminal HVDC Grids for Offshore Wind Power Delivery

In this paper, the improved synergetic control (ISC) is proposed for the multi-terminal HVDC grid. The following improvements are introduced to the control design: modifications in the control manifold, inclusion of voltage-power droop characteristics, and optimal selection of control parameters using particle swarm optimization (PSO). The proposed ISC scheme is characterised with enhanced dynamic performance and satisfactory robustness against system uncertainties. It is designed to regulate terminal dc voltage, active and reactive power. The comparison of the developed ISC and the optimal PI control is presented in this work, showing the superior transient performance and robustness of the ISC scheme.