MHK Technologies/Denniss Auld Turbine

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Denniss Auld Turbine.jpg

Technology Profile
Primary Organization Oceanlinx
Project(s) where this technology is utilized MHK Projects/GPP Namibia
MHK Projects/Greenwave Rhode Island Ocean Wave Energy Project
MHK Projects/Hawaii
MHK Projects/Oceanlinx Maui
MHK Projects/Port Kembla
MHK Projects/Portland
Technology Resource
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Technology Type
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Oscillating Water Column
Technology Readiness Level
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TRL 4: Proof of Concept
Technology Description The turbine used in an Oscillating Water Column (OWC) is a key element in the devices economic performance. The Oceanlinx turbine uses variable pitch blades, which, with the slower rotational speed and higher torque of the turbine, improves efficiency and reliability and reduces the need for maintenance. The turbine uses a sensor system with a pressure transducer that measures the pressure exerted on the ocean floor by each wave as it approaches or enters the capture chamber. The transducer sends a voltage signal proportional to the pressure that identifies the height, duration and shape of each wave. The signal from the transducer is sent to a Programmable Logic Controller (PLC) that adjusts various parameters, such as the blade angle and turbine speed, in real time. The generator, which is coupled to the Oceanlinx turbine, is designed so that the electrical control will vary the speed and torque characteristic of the generator load in real time to maximize the power transfer. An induction machine will be used for the generator, with coupling to the electricity grid provided by a fully regenerative electronic control system. The grid interconnection point and the control system are located in a weatherproof building external to the air duct. The voltage of the three phase connection at this point is 415 V L-L at 50 Hz. With the appropriate phase and pulse width modulation, power is transferred in either direction with harmonies and power factor variation contained within the electricity authoritys requirements. The system is normally configured to operate at a power factor of 0.95 or better.

Mooring Configuration The Oceanlinx Mark 3 Wave Energy Converter is deisgned to operate with a catenary mooring system

Technology Dimensions
Device Testing
Date Submitted 9/28/2010

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