A modular and scalable HVDC current flow controller

Due to technical and economic benefits there is an increasing interest in establishing an overlaying HVDC grid. Therefore, a current flow control is essential. In this paper a modular and scalable HVDC current flow controller is presented, which allows a direct exchange of power between two or more cables. In the first section the functional principle of the HVDC Balancing MMC is presented and a fundamental analysis of the steady state operation is done. In the second section an average loss calculation is described. In both sections the general results are discussed for a chosen point of operation.