Sequential algorithm-based model for the study of AC/DC power flow in VSC-MTDC systems

Nowadays there is a widespread interest in the implementation of the super-grid concept using multi-terminal HVDC systems, MTDC. One useful tool to pursue this purpose is the availability of AC/DC power flow models. Nevertheless, the power flow models available in the literature do not provide a suitable approach to perform studies with AC transmission systems which integrate VSC-HVDC links and MTDC grids. In this work, a power flow model takes into account the stations VSC-HVDC of a MTDC system is presented. The model uses a programmable sequential algorithm which includes the study of the flows between the AC system and the MTDC. Therefore it allows to interconnecting multiples AC nodes by means of a MTDC. The algorithm is implemented using MATPOWER libraries.