A novel fault ride-through capability improvement scheme for the hybrid offshore wind-wave energy conversion systems

Publication Name

Electric Power Systems Research


The hybrid offshore wind-wave energy conversion systems (HOW-WECS) have a huge potential for clean electricity production. However, many of the technical challenges associated with HOW-WECS need to be addressed before its full-scale commercialization. One of the main challenges is the fault ride-through (FRT) capability of the HOW-WECS, which is the focus of this study, as this issue has not been addressed in any of the previous studies. In this study, multiple linear generator-based wave energy converters (WECs) are integrated with a single doubly-fed induction generator (DFIG)-based wind energy conversion system to form the HOW-WECS. A new scheme is proposed to enhance the FRT capability by controlling the damping forces of the integrated WECs. During fault conditions, the excess kinetic energy of the wind turbine can be absorbed by the linear generator-based WECs through damping control. In this way, the dc-link voltage of the back-to-back power electronic converters of the DFIG can be kept within the safe operating limits without any additional DC chopper circuit or crowbar control to dissipate the power. Other characteristics of the DFIG including the stator voltage, rotor voltage, stator current, and rotor current, are also monitored and compared with and without the proposed scheme. The results prove the effectiveness of the implemented scheme, as the HOW-WECS can operate safely under normal and fault conditions.

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