Abstract
Composite bucket foundations, which have been successfully transported, installed, and operated at the Qidong, Xiangshui, and Dafeng offshore wind farms in China, are economically advantageous due to the relatively simple transportation and installation process. The innovative one-step transportation and installation technology of foundation-tower-nacelle is the key phase in saving costs. In this paper, a “foundation lift ship” overall transport mode is proposed and introduced for the first time. Prototype data measurement, preliminary numerical simulation, and theoretical calculations were conducted to investigate whether the foundation-ship integrity, tower hoop stability, and various indexes of the nacelle met the requirements under the influences of various environmental factors. The multi-system coupling motion mechanism and analysis method of this new structure and transportation mode were expounded. Through the prototype observation data of the one-step overall transportation, the ship-foundation system reliability of the structure in the case of large wind and wave was confirmed. Furthermore, it was found that in the one-step overall transportation, the importance of factors to nacelle acceleration decreased in the order of wave height, current speed, and wind speed by the time and frequency domain analysis and data statistics.
Highlights
With the rapid development of the world economy and the increasing energy consumption, the utilization of new renewable energy is an inevitable trend of social development
Based on the analysis of the prototype observation data, we propose a set of environment-vibration prediction systems for the one-step overall transportation of composite bucket foundation (CBF) by using the method of multiple linear regression
The most severe sea state encountered in the Dafeng CBF transportation was a 12.3 m/s wind speed and 2.2 m wave height
Summary
With the rapid development of the world economy and the increasing energy consumption, the utilization of new renewable energy is an inevitable trend of social development. Compared with the construction of onshore wind farms, offshore wind farms are faced with a more complicated and harsh offshore environment, which makes their construction more difficult and have a lower operational period, greatly increasing the cost and time limit of offshore wind power development. The European offshore wind power costs have fallen rapidly. 98.3 €/MWH of the bidding price, compared with the China’s cost staying between 125.5–180.5 €/MWH, which is a large gap with the European developed countries, and is higher than the price. €/MWH offshore wind power and 96.03 €/MWH for intertidal wind power.
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