Microgrid concept is becoming very popular in the world where different forms of renewable energy resources are integrated in a hub to supply electricity in remote areas and islands. The main goal of my PhD thesis is to design and analyse the performance of a DC-DC converter used in a microgrid for offshore applications including the control of the DC bus voltage. The following specific objectives will be taken into consideration in our project: (i) In collaboration with P.3.20.002, review the challenges posed by DC microgrids in particular as to architecture and control aspects. These will include the commercial availability of suitable DC–DC converters (voltage, power, bi-directional capability, transient performance), how to set the DC bus voltage and strategies for energy management. (ii) Review the barriers to building DC-powered electrolysers. (iii) Review the barriers to building DC-output wind turbines, tidal flow turbines and wave generators. (iv)Set up a bench-scale pure-DC microgrid at the few-kW scale using configurable electronic components to emulate any desired energy converter. (v) Based on the findings of Task 2 of P.3.20.002, set up a viable DC microgrid architecture and explore the problems of transient behaviour with rapidly changing inputs and loads. (vi) Report on the findings of the review, the experimental study and the prospects for scale-up to the 1 MW level and above.