The combined exploitation of offshore wind power and ocean wave energy is a very recent research topic . Currently, there are two types of combined wind-wave systems: colocated and hybrid, some of which emerge on the website. Co-located systems combine the wind farm and the wave array with independent foundation, such as Wave Star (2012), Wave Treader and WEGA . Hybrid systems are that offshore WTGs and WECs are installed on the same platform working as an unit, such as W2Power and Poseidon. The modeling and testing of some combined systems are also performed . Besides these designs, some experts believe that the combined systems have great perspectives