Research on the Station AC Bus Fault-Crossing in Hybrid Half-Wavelength System

VSC-HVDC is a good way for new energy to access large power grids. It is used as a “third-terminal” to access half-wavelength transmission system to achieve AC-DC hybridization. However, AC bus in DC terminal has a short-circuit fault will lead the appearance of over-current in DC system and over-voltage along the AC system. In order to reduce the impact of the fault, a method of accessing a current limiting module at the DC bus is proposed. The current limiting resistor makes capacitor voltage attenuate over-damped and non-oscillating, and limits the over-current. Finally, the simulation proves that the module can effectively improve the fault traversal capability of the system.