CHALLENGES OF HVDC & ITS PROSPECTS

In order to transmit massive amount of power generated by remotely located power plants, especially offshore wind farms, and to balance the intermittent nature of renewable energy sources, the need of renewable energy sources, the need for a stronger high voltage transmission grid is antic-ipated. Due to limitation in AC power transmission the most likable choice for such a grid is a high voltage DC (HVDC) grid. However, the concept of the HVDC grid is still under active development as different technical challenges exist. This paper deals with prospects and technical challenges for the future HVDC super grids. A comprehensive overview of different sub-module implementations of multilevel module convertor is given. An overview of short circuit behavior of the modular multilevel converter is also given, as well as a discussion on the choice between cables or overhead lines.