Tidal Stream Energy Converters

Most forms of tidal stream energy converter to date have been analogous to wind turbines, in that they have centred around horizontal axis, multi bladed turbines, e.g. [40, 41]. As such they produce slow speed rotational motion, typically of the order of 10 rpm, which has previously demanded the utilisation of a gearbox drive train. This type of device falls outside the scope of this research, which focuses on reciprocating, primarily linear, generators. It should be noted, however, that rotary versions of the electrical machine topologies presented here would be suitable for use in these devices and hence many of the issues addressed are also relevant to this type of converter.

One device exists, however, which does require slow speed reciprocating linear power take off. The Stingrayâ„¢ is a seabed-mounted device, consisting of one or more hydroplanes with variable angle of attack [42]. Figure 1.8 shows this device and the direction of tidal flow. As the angle of attack of the hydroplane is altered, so too is the resultant force on the pivot arm. The entire hydroplane and pivot arm can hence be made to oscillate about the post in a vertical plane.

Figure 1.8: Stingray tidal stream generator

At present power take off is by way of four high pressure hydraulic cylinders mounted at the top of the post, coupled to the pivot arm. Chapter 7 explores this device and its power take off more fully.

di recti o tidal flo

Figure 1.8: Stingray tidal stream generator

- pivot arm post

Renewable Energy Eco Friendly

Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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