Owing to constraints of environmental conditions

conventional evaluation methods developed for onshore wind farms are no longer suitable for offshore wind farms. To solve this problem

the need of combined repair has been fully considered and introduced into the traditional operation and maintenance(O&M)process to develop a more realistic and optimal process for offshore wind farms. The combined repair oriented O&M model for offshore wind farm has been implemented by dividing the O&M process into sub-modules and studying the mathematical simulation for each sub-module

including fault detection

spare-part management and offshore maintenance. Simulation results show that the O&M model developed can simulate the O&M for differently sized offshore wind farms under various environmental conditions and predict their availability

power generation

power loss and O&M cost with good accuracy. In addition

the implementation of this O&M model along with the sensitivity analysis method can assist in determining the optimal parameters for O&M vessels. This work is supported by National High Technology Research and Development Program of China(863 Program)(No. 2012AA051707)and China Huaneng Group(No. HNKJ13-H20-01).