A Modified HVAC Wind Energy Collection System Without Offshore Substation

A modified structure of the high voltage (HV) AC energy collection system for offshore wind farms (OWF) is proposed in this paper which can help to reduce the installation cost significantly. For this, a three winding transformer is considered on all wind turbine (WT) nacelles instead of the two-winding first level step-up transformer. A parallel-series connection of the windings of this transformer is introduced, which helps to obviate the second level bulky step-up transformer and the costly offshore sub-station (OSS). The suitability of the proposed structure is verified through simulation in PSCAD platform under normal operating condition and various probable contingencies,