A low frequency power collector alternative system for long cable offshore wind generation

This paper aims at presenting further results of engineering studies undertaken to access relevant aspects to design and implement Low Frequency AC Power Transmission systems (LFAC) associated with large-scale, above 1,000 MW, offshore wind power generation distant 200 km or more from the shoreline. This technology was proposed in 2010 [1], to evacuate wind power generation in the North Sea, for schemes with long transmission distances, for which 50 Hz AC systems are not technically viable. In addition, the application of this technology aims at achieving a simpler technical solution than deploying fully-fledged offshore HVDC converter stations proven to lead to large platform topsides. The use of simpler AC hubs are also proposed comprising a limited number of array cables connected to them such that the AC LFAC cables can concentrate the power from these AC hubs and export it to the shore at low frequency.