Simulation of Offshore Wind System with Three-Level Converters: HVDC Power Transmission in Cloud Scope

2015 ◽  
pp. 440-447 ◽  
Author(s):  
M. Seixas ◽  
R. Melício ◽  
V. M. F. Mendes ◽  
M. Collares-Pereira ◽  
M. P. dos Santos
Keyword(s):  
Power Transmission ◽  
Offshore Wind ◽  
Wind System

Elastomeric Risers in the Offshore Wind Industry

2020 ◽  
Vol 54 (6) ◽  
pp. 77-83
Author(s):  
David G. Aubrey ◽  
Jennifer Wehof ◽  
Stephen O'Malley ◽  
Rajai Aghabi
Keyword(s):  
Environmental Monitoring ◽  
Fiber Optic ◽  
Power Transmission ◽  
Autonomous Underwater Vehicle ◽  
Data Transfer ◽  
Benthic Communities ◽  
Underwater Vehicle ◽  
Offshore Wind ◽  
Monitoring Systems ◽  
Fishing Activity

AbstractFloating LiDAR systems (FLS) and other moored environmental monitoring systems are used extensively for wind and environmental assessments in offshore wind projects. In addition, wave energy converters (WECs) are being evaluated for more extensive use in coastal and deeper waters, most of which also require anchoring to the seabed. Since these systems must be moored, heavy anchors and typically heavy chain are used to secure the mooring and measurement/WEC buoy to the seabed. Disadvantages of present mooring technology include 1) damage to the seabed and benthic communities in vicinity of the mooring, as chain sweeps over the sea bottom; 2) an unnecessarily large watch circle at the water's surface; 3) slightly increased likelihood of marine mammal entanglement; 4) mooring damage from nearby fishing activity; and 5) likelihood of mooring failure due to self-entanglement within the mooring itself. This study presents an alternative mooring using mechanically compliant, elastomeric hoses to connect the buoyed system to the bottom anchor. Modeling the two mooring types with a typical buoy used in wind resource assessments shows a significant decrease in anchor drag area and surface watch circle with the use of the elastomeric hose versus the traditional chain and polyethylene line mooring. The hose also is equipped with copper conductors and/or fiber-optic conductors, providing power and data transmission between the bottom and the surface. For WEC solutions, the elastomeric hose provides similar benefits as for FLS and environmental monitoring systems, with the added advantage of being able to transmit power to the seafloor for distribution. For one WEC application, we have developed an elastomeric solution containing not only larger copper conductors to enable power transmission but also fiber-optic conductors to permit data transfer from a garage mounted on the bottom (servicing an autonomous underwater vehicle [AUV] or unmanned underwater vehicle [UUV], for instance) to the surface buoy for onward transmission to shore.

Enhanced Diode-rectifier HVDC for Offshore Wind Power Transmission

2019 ◽  
Author(s):  
Fan Cheng ◽  
Liangzhong Yao ◽  
Ke Ji ◽  
Chao Ding ◽  
Qiangqiang Wang ◽  
...  
Keyword(s):  
Wind Power ◽  
Power Transmission ◽  
Offshore Wind ◽  
Offshore Wind Power

scholarly journals Summary of Conclusions and Recommendations Drawn From the DeepCwind Scaled Floating Offshore Wind System Test Campaign

2013 ◽  
Author(s):  
Amy N. Robertson ◽  
Jason M. Jonkman ◽  
Andrew J. Goupee ◽  
Alexander J. Coulling ◽  
Ian Prowell ◽  
...  
Keyword(s):  
Wind Wave ◽  
Department Of Energy ◽  
Offshore Wind ◽  
Scale Model ◽  
Wind System ◽  
Complex Dynamic ◽  
Offshore Wind Power ◽  
Research Initiative ◽  
Work Done ◽  
The U.S

The DeepCwind consortium is a group of universities, national labs, and companies funded under a research initiative by the U.S. Department of Energy (DOE) to support the research and development of floating offshore wind power. The two main objectives of the project are to better understand the complex dynamic behavior of floating offshore wind systems and to create experimental data for use in validating the tools used in modeling these systems. In support of these objectives, the DeepCwind consortium conducted a model test campaign in 2011 of three generic floating wind systems: a tension-leg platform (TLP), a spar-buoy (spar), and a semi-submersible (semi). Each of the three platforms was designed to support a 1/50th-scale model of a 5-MW wind turbine and was tested under a variety of wind/wave conditions. The focus of this paper is to summarize the work done by consortium members in analyzing the data obtained from the test campaign and its use for validating the offshore wind modeling tool, FAST.

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