Performance evaluation of PMSG-based LFAC system for offshore wind power

Nowadays, the practice of Low Frequency AC (LFAC) transmission and grid integration for the multi mega-watt (MW) long distances is an interesting approach. The LFAC approach has the ability to solve the charging current problem in underground AC cables and is an alternative to the conventional offshore transmission schemes. This paper presents the Permanent Magnet Synchronous Generator (PMSG)-based LFAC transmission for offshore wind power to integrate the onshore grid. The PMSG-based offshore wind power is integrated onshore grid via LFAC and High Voltage AC for comparison. The Machine Side Converter extracts the maximum power from the wind and maintains the generator terminal voltage, whereas Grid Side Converter (GSC) maintains the constant DC link voltage by adjusting the dq currents of the grid. The simulation results demonstrate and verify the significant improvement in the power transfer capability, reduced power loss and control schemes performance. The complete work is modelled and analysed using PSCAD/EMTDC. © 2019 Informa UK Limited, trading as Taylor & Francis Group.