power summit 2011: voith hydro the only company which is actively developing both wave and tidal power technologies

1. Dr. Jochen Weilepp, Managing Director Voith Hydro Ocean Current Technologies Power Summit 2011:

2. | 2009-03-20 | 2

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4. | 2009-03-20 | 4 Only a fragment of the wave power technology patchwork Even though the first wave energy patent was filed in 1799, wave power is still a young technology in a very exciting period of development. Not unlike the early years of conventional hydropower where there were many ideas being put forward. Of course, as happened in both the conventional hydro and wind power industries, this large patchwork of ideas will eventually converge on a few key concepts which can be refined into the most commercially viable solutions for the future. In the pictures here we can see examples of “point absorbers” or buoys that convert the up and down motion into electricity, surface following or “attenuators” , “terminators” that line up perpendicular to the wave front, oscillating water column (a type of terminator) where the wave action drives air through a turbine, and overtopping (where the crests of waves are guided into a reservoir which empties back into the ocean through a hydro turbine) There’s even a vertical axis concept that converts the rolling sub-surface wave currents into rotation...Some are designed to be positioned offshore, some near shore, and some onshore..One of the main reasons for considering offshore technologies is that more energy is available in deep water. This is because energy is dissipated when a wave enters shallow water, through the processes of wave breaking and sediment transport. The main disadvantage for offshore devices is the distance between the devices themselves, and the load or grid to which they’re connected. Effects include higher capital cost for longer cables, line losses (which are related to the length of the cables), and more travel for maintenance crews. Even though the first wave energy patent was filed in 1799, wave power is still a young technology in a very exciting period of development. Not unlike the early years of conventional hydropower where there were many ideas being put forward. Of course, as happened in both the conventional hydro and wind power industries, this large patchwork of ideas will eventually converge on a few key concepts which can be refined into the most commercially viable solutions for the future. In the pictures here we can see examples of “point absorbers” or buoys that convert the up and down motion into electricity, surface following or “attenuators” , “terminators” that line up perpendicular to the wave front, oscillating water column (a type of terminator) where the wave action drives air through a turbine, and overtopping (where the crests of waves are guided into a reservoir which empties back into the ocean through a hydro turbine) There’s even a vertical axis concept that converts the rolling sub-surface wave currents into rotation...Some are designed to be positioned offshore, some near shore, and some onshore..One of the main reasons for considering offshore technologies is that more energy is available in deep water. This is because energy is dissipated when a wave enters shallow water, through the processes of wave breaking and sediment transport. The main disadvantage for offshore devices is the distance between the devices themselves, and the load or grid to which they’re connected. Effects include higher capital cost for longer cables, line losses (which are related to the length of the cables), and more travel for maintenance crews.

5. | 2009-03-20 | 5 But all can be collapsed to three base technologies

6. | 2009-03-20 | 6 Voith Hydro Wavegen is the pioneer in wave power

7. | 2009-03-20 | 7 Turbines developed over the years 20 to 250kW Turbines. Deployed in multiple MW arrays.

8. | 2009-03-20 | 8 The technology works!

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10. | 2009-03-20 | 10 La Raince in Frankreich geograpisch La Raince in Frankreich geograpisch

11. | 2009-03-20 | 11 seit 20 Jahren machen sich einige Erfinder Gedanken ARD Nachrichten EON Werbespot MCT Sizilien Vertikalachsenrotorseit 20 Jahren machen sich einige Erfinder Gedanken ARD Nachrichten EON Werbespot MCT Sizilien Vertikalachsenrotor

12. | 2009-03-20 | 12 The tidal current resource represents a challenging environment Flow direction changes every six hours by (almost) 180 degrees Machine has to be installed in an environment at strong tidal currents (8-10 knots are possible) – only approximately 1 hour per cycle of almost standing water Machine has to be operated safely under (salt-) water and should ideally never fail – in case of failure it has to be recovered safely at minimum costs

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14. | 2009-03-20 | 14 Built-in simplicity as guiding design principle for our tidal technology No failure-prone technologies under water No gearbox ? direct drive No static excitation ? permanent excitation No dynamic seals ? water passes through generator “water” gap No greasing of bearings ? sea water lubricated bearings No adjustment to flow direction ? symmetric blades No blade pitch ? torque control Initially: Power electronics located on land

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