Simulation of grid connected HVDC offshore wind farm topolgies

This paper presents two topologies to connect HVDC offshore wind farm into the grid, the offshore part consist of five units; in the first topology, each unit contains a permanent magnet synchronous generator (PMSG) connected to a three level neutral point clamped converter (3L-NPC) to control the generator speed by using a maximum power point tracking (MPPT) control. The offshore platform consists of a half bridge connected in series to balance the voltage between the units and to collect the voltage in order to get the desired DC voltage. In the second topology, each unit contains a PMSG connected to 3-phase/3-phase matrix converter (MC) to control the generator speed by using a MPPT control. The offshore platform consists of a three phase High Frequency Transformer (HFT); the primary of each phase of the transformer connected to one phase from each unit. The secondary of the transformer connected to three phase diode bridge rectifier to get HVDC. The HVDC cable is used to transfer power from the offshore side to the onshore side. A Modular Multilevel Converter (MMC) is used in the onshore side to convert the voltage from DC to AC voltage and to integrate the offshore wind farm into the Grid.