Faults analysis for combined MMC and AAC with practical HVDC grid
Modular Multilevel Converter (M2C) and Alternate-Arm Converter (A2C) are the prevalent types of voltage-source converter (VSC) topology for HVDC applications. A novel model of the VSC using combined M2C and A2C is proposed in this paper. This new model is applied to practical HVDC links between France and Spain, which has 320 kV, 2 GW by inserting M2C in sending end and A2C in receiving end. The combination models are interconnecting with two 400 kV high-voltage AC grids. This paper considers the interaction of the combined models with all types of faults analyses. DC Line-to-Line and DC Line-to-Ground Faults are carried out. Symmetrical and unsymmetrical faults are carried out involves all types of faults. Single-phase, two phase and three phase to ground faults at the sending side of the proposed models are tested one by one.