1. Department of Electrical Engineering, Uppsala University, 751 03 Uppsala, Sweden
2. Seabased AB, 46 Mount Street Upper, D02 RX88 Dublin, Ireland
3. Department of Hydraulic Engineering, Faculty of Civil Engineering and Geosciences, Marine Renewable Energies Lab, Offshore Engineering, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands