| Abstract |
In this paper, a new bidirectional DC-DC converter based on the Marx principle for offshore windfarmsis presented. The proposed topology is named 'Bidirectional Modular DC-DC converter' (BMDC). Theoperating principle and the theoretical analysis of the converter under both boost and buck modes arepresented, and demonstrate that a high step-up and step-down voltage gain can be achieved with anappropriate fixed duty ratio. The two inductors of the converter are designed to resonate with thecapacitors to create resonance, forcing current zeros to enable zero current switching, and therebyreducing switching losses during both modes of operation. Simulation of a 50 MW, 6 kV/ 30 kVconverter with a switching frequency of 2kHz is explained, and the results are presented and discussed. |
