A comprehensive modeling, analysis, and control design framework for multi-terminal direct current (MTDC) grids is presented together with their interaction with the surrounding AC networks and the impact on overall stability.<br />• The first book of its kind on the topic of multi-terminal DC (MTDC) grids <br />• Presents a comprehensive modeling framework for MTDC grids which is compatible with the standard AC system modeling for stability studies<br />• Includes modal analysis and study of the interactions between the MTDC grid and the surrounding AC systems<br />• Addresses the problems of autonomous power sharing and exchange of frequency support across a MTDC grid and evaluates their impact on overall stability<br />• Summarizes the state-of-the-art, challenges and on-going research and development initiatives for DC fault current interruption