Stability Analysis of a Hybrid Multi-Infeed HVdc System Connected Between Two Offshore Wind Farms and Two Power Grids

2017 ◽  
Vol 53 (3) ◽  
pp. 1824-1833 ◽  
Author(s):  
Li Wang ◽  
Zhi-Hao Yang ◽  
Xiu-Yu Lu ◽  
Anton V. Prokhorov
Keyword(s):  
Stability Analysis ◽  
Wind Farms ◽  
Power Grids ◽  
Offshore Wind ◽  
Offshore Wind Farms ◽  
Hvdc System

scholarly journals Stability Analysis of the Floating Offshore Wind Turbine Support Structure of Cell Spar Type during its Installation

2019 ◽  
Vol 26 (4) ◽  
pp. 109-116
Author(s):  
Paweł Dymarski ◽  
Czesław Dymarski ◽  
Ewelina Ciba
Keyword(s):  
Stability Analysis ◽  
Wind Farms ◽  
Offshore Wind ◽  
Design And Technology ◽  
Offshore Wind Turbine ◽  
Ocean Engineering ◽  
Support Structure ◽  
Offshore Wind Farms ◽  
University Of Technology ◽  
The Stability

Abstract The article presents the results of selected works related to the wider subject of the research conducted at the Faculty of Ocean Engineering and Ship Technology of the Gdansk University of Technology, which concerns design and technology of construction, towing, and settlement on the seabed, or anchoring, of supporting structures for offshore wind farms. As a result of this research, several designs of this type of objects were developed, including two stationary types: gravitational and Jack-up, which are placed on the seabed, and two floating types: TLP and SPAR, anchored with tendons and anchors in the form of nailed or suction piles. Below presented is the stability analysis of the new floating CELL SPAR type support structure for offshore wind turbines during its installation in waters with a depth of over 65 m.

scholarly journals Offshore Wind Farms On-Site Submarine Cable Testing and Diagnosis with Damped AC

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3703 ◽  
Author(s):  
Gulski ◽  
Jongen ◽  
Rakowska ◽  
Siodla
Keyword(s):  
Wind Farms ◽  
International Standards ◽  
Power Grids ◽  
Offshore Wind ◽  
Power Cables ◽  
Testing Technique ◽  
Offshore Wind Farms ◽  
Current State ◽  
Repair Costs ◽  
Testing Solution

: The current power cables IEC standards do not provide adequate recommendations for after-laying testing and diagnosis of offshore export and inter-array power cables. However the standards IEEE 400 and IEEE 400.4 recommend partial discharge monitored testing, e.g., by continuous or damped AC voltages (DAC). Based on the international experiences, as collected in more than 20 years at different power grids, this contribution focuses on the use of DAC for after-laying testing and diagnosis of submarine power cables both the export and inter-array cables. Higher risk of failure, long unavailability, higher repair costs, and maintenance costs imply that advanced quality control is becoming more important. The current state of the existing and drafting international standards are based on onshore experiences and not related to the actual serious problems experienced with failures on export up to 230 kV and inter-array cables up to 66 kV. The application of damped AC as a testing solution in this concern is specially discussed. The advantages of this testing technique, in combination with actual testing examples, show the findings on export and inter-array cables at offshore wind farms.

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