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The nacelle weight reduction is a key design criterion for offshore wind turbines, when these are reaching towards 10 MW. To overcome the weight challenge, a transformer-less concept is under development. This concept employs a special permanent magnet synchronous generator (PMSG) with an innovative system for high insulation level. The generator supplies nine series connected converter modules, which...
A wind farm (WF) connected by voltage source converter-based HVDC (VSC-HVDC) results in a completely ‘inertia-less’ in offshore AC grid . AC frequency is determined by control of the VSC-HVDC on the WF side, independently of the main grid frequency. Moreover, the rotational speed of a variable speed wind turbine is independent of the AC frequency of the offshore AC grid. These two aforementioned features...
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