Stability analysis of an offshore grid supplied by a HVDC-VSC

The establishment of offshore AC grids gives the opportunity to connect wind farms and oil platforms within the limited distance of AC cables. Several of these AC grids can be interconnected and connected to shore by a multi-terminal DC grid. In order to supply oil platforms it is important that the offshore AC grid can assure reliable power with acceptable quality. This is analyzed by establishing a conceptual AC grid in the simulation program Simpow. The simulations show that the grid does sustain good power quality as long as the connection to the multi-terminal DC grid is in operation.