Voltage source converter connected to very weak grids under disturbances

Abstract

High Voltage Direct Current (HVDC) transmission lines are increasing rapidly and Voltage Source Converter (VSC)-based is one of the most famous types used in the industry. Despites all of its merits, VSCs have not been favored in very weak grids because of stability issues. Recently, these issues have generated much attention in literature and different solutions are proposed. Among the discussed solutions, the artificial bus is one of the most straight-forward and effective methods, which enable VSC to inject or absorb its maximum nominal power. However, this method is not examined under grid disturbances. This paper studies the impact of severe faults, phase jump and frequency changes and discusses the inherent robustness of the method to fill a serious gap in the literature.