Auxiliary power supply for control unit for switch in half-bridge Modular Multilevel Converter cell

摘要

The present disclosure relates to a switch position 36 for a half-bridge Modular Multilevel Converter (MMC) cell 3. The switch position comprises a semiconductor switching unit 32 comprising a Position Control Unit (PCU) 34 for controlling the position of the switching unit and comprising an energy storage for powering the PCU. The switch position also comprises a onedirectional semiconductor device 33 connected anti-parallel to the switching unit. The switch position also comprises an energy transfer unit 35 arranged for charging the energy storage of the PCU by means of electromagnetic induction from a current flowing through the anti-parallel one-directional semiconductor device.