The Operation and Maintenance Model for Cost Estimation of an Offshore Wind Farm-BY Jae-Hee Park-A THESIS FOR THE DEGREE OF MASTER OF ENGINEERING -JEJU NATIONAL UNIVERSITY

The Operation and Maintenance Model for Cost Estimation of an Offshore Wind Farm

GRADUATE SCHOOL JEJU NATIONAL UNIVERSITY Jae-Hee Park

A THESIS FOR THE DEGREE OF MASTER OF ENGINEERING

Abstract

Several European countries have defined targets to install and to operate offshore wind energy and according to these targets more than 40 GW offshore wind power is expected for the year 2020. Republic of Korea has also defined targets to install and operate offshore wind energy as part of its renewable energy goals. According to its targets, more than 2.5 GW offshore wind power is expected to be installed across Jeju island region and the west side of mainland by the year 2020. So the required effort for operation and maintenance of offshore wind farms will be enormous, also a thorough and appropriate plan of maintenance during the lifetime of these offshore wind turbines is essential for an economical exploitation. The aim of this thesis is to develop operation and maintenance model for an offshore wind farm in Rep. of Korea considering regional marine situation. The model should include both preventive and corrective maintenance plans which needs basic concept of wind energy, wind turbine, and maintenance strategies. The model should be based on real time metrological data, geographic data, generic wind turbine data, equipment data, spare parts and repair data. A 10 minute time series of wind speed data in public water surfaces of Daejeong-eup and 1 hourly time series of Marado significant wave height data in 2010 are used for metrological data. Equipment data is based on vessels of the operating offshore wind farm in the North Sea. Spare parts are modeled from commercial wind turbine components contribution and costs. To define repair data, there are various categories and step to determine the sequence of maintenance phases, and the corresponding amount of work, required equipment and time to organize an each maintenance phase. The operation and maintenance costs are estimated for one year in order to verify the model. A plan of operation and maintenance is set up for offshore wind farm in Jeju Island, Rep. of Korea. The results show that availability of Jeju wind farm is around 90 %. The sum of revenue losses and the total costs of repair is estimated to be approximately 27 % of generation cost which includes 11 % of the total generation cost due to limited equipment usage and 9 % of the total generation cost due to revenue losses for one year in the offshore wind farm. The proposed model can be used for the analysis of different aspects that include overall contributions and costs of operation and maintenance and to make an operation and maintenance support organization and plan for offshore wind farm in Rep. of Korea.

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