in combination with a simple straight blade with minimal use of stiffer more expensive materials.”
The jacket designed by 2-B Energy
is a result of modelling of wind turbine behaviour resulting in both extreme and fatigue loads. As part of the design integration, the relationship between nacelle and structure loading was carefully considered. The design of the jacket also integrates the components of traditional tower, transition piece and foundation into a single design. The design of the jacket for the 2B6
also results in a simpler transition piece and reduces overall weight (the design reduced weight by around 15 per cent compared to a four-legged structure). Having a smaller footprint means that more foundations can be transported on an installation vessel or barge. Enabling maintenance personnel to access the turbine by helicopter around the clock is a major potential advantage. Another advantage of being able to land the helicopter on the nacelle is that doing so will use much less fuel than hovering above it and then deploying personnel. A hoisting helicopter working in a windfarm is required to hold enough fuel to reach a ‘secondary’ landing deck (often on shore). This requires it to carry more fuel. On a trip to a typical North Sea windfarm, such as Alpha Ventus, this means that the helicopter can only carry two passengers and 50kg of tools (assuming the use of an EC 135) before the helicopter needs to refuel and pick up another team of technicians. For three full service teams of 12 technicians, this means six trips and refuelling six times and a total of 300kg of tools. In contrast, if the helicopter is able to land on the turbine, as is the case with the 2B6, the fuel restriction is eliminated because there will always be multiple secondary landing pads on other turbines. One of the greater costs involved in building an offshore windfarm is, of course, transportation and installation, and 2-B Energy believes that its turbine can reduce costs in a number of ways, not least by having the rotor mounted on the nacelle during transportation and installation, thus increasing efficiency and reducing installation time. The combined nacelle and rotor can be lifted and installed in a single lift, eliminating blade handling, rotor turning and tool changes that would otherwise be required. OWJ
www.owjonline.com
2-B Energy believes that its two-bladed turbine has a number of important advantages compared to conventional three-bladed designs
in brief…
• Siemens has obtained type certification from certifying body DNV GL for the company’s innovative D6 offshore wind turbine. The SWT-6.0-154 has a direct-drive generator, rated at 6MW, and a 154m rotor. With a tower head mass of only 360 tonnes, the 6MW machine is around one-third lighter than comparable turbines.
• Skovgaard Invest ApS, Energicenter Nord and MHI Vestas Offshore Wind have reached a conditional agreement for the acquisition of four V164-8.0 MW offshore wind turbines for the Velling Mærsk project in Western Denmark. The agreement allows for phase two development of the new turbine to commence. The Velling Mærsk project will use the 0-series V164-8.0 MW in order to test installation methods and operation and maintenance procedures on shore prior to the commencement of series deliveries off shore. The first V164-8.0 MW prototype was installed at the Danish national test centre in Østerild earlier this year and is currently being tested in partnership with Dong Energy.
• Vestas is understood to be seeking permission from the authorities in Denmark to test turbines of up to 10MW in waters west of Jutland. Vestas is developing the turbines together with Mitsubishi Heavy Industries as part of the MHI Vestas Offshore
joint venture. Documents submitted by the company relate to tests of the joint venture’s 8MW turbine but are understood to include a request to be allowed to install 10MW units.
• China Ming Yang Wind Power has entered into a heads of agreement with Marin Energi Testcenter AS (MetCentre) to erect a 6.0MW Super Compact Drive (SCD) wind turbine generator in the Karmoy wind turbine demonstration area off the coast of Karmoy Island in Norway. MetCentre is a Norwegian test centre for marine energy offering infrastructure and services to offshore wind power. The proposed co-operation and the pilot project are subject to certain conditions, including a detailed agreement, which is expected to be entered into by both parties in late 2014. The SCD utilises permanent magnet generators coupled with a smaller gearbox housed in a water-cooled nacelle with an innovative two-bladed design. Gamesa showcased its new 5.0MW turbine, the G132-5.0 MW, at the 2014 Global Offshore Wind conference and exhibition in Glasgow earlier this year. The G132-5.0 MW leverages knowhow and experience acquired during the validation of the company’s existing 5.0MW platform, which culminated recently in type certification for the G128-5.0 MW from DNV-GL.
Offshore Wind Journal I 3rd Quarter 2014 I 45
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