A Novel Configuration of a Hybrid Offshore Wind-Wave Energy Conversion System and Its Controls for a Remote Area Power Supply

This article aims to develop a novel hybrid offshore wind-wave energy conversion system (HOW-WECS) configuration which can successfully feed a stable power to the customers of remote communities in near-shore areas or remote islands. The proposed configuration uses a minimum number of converters for the integration of the doubly-fed induction generator (DFIG) based wind energy system with the direct-drive linear permanent magnet generator (DDLPMG) based wave energy system. Advanced control schemes for the DFIG and the DDLPMG are presented to enhance the power extraction from the implemented HOW-WECS. The dynamic and the transient performance of the proposed system and the associated control schemes are tested under various operating scenarios and electrical fault conditions. The dynamic performance was acceptable as the implemented control strategies were able to keep the stator voltage and the stator current of the DFIG sinusoidal and balanced, the frequency excursions are within the acceptable band, and the common ac-bus voltage of the distribution network stable under all operating scenarios. The results prove the effectiveness of the proposed system under transient conditions and the ability of the proposed HOW-WECS to recover quickly to gain its pre-fault conditions once the fault was cleared.