226 – Tidal Power
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Guest: Pieter de Haas Host: Markus Voelter Shownoter: Andy Joiner
Tidal power refers to extracting electrical energies out of the tide streams in oceans. Various techniques exist. Tocardo is a provider of axial turbines, and our guest, Pieter de Haas, is their CTO. In this episode we talk about tidal power in general, siting, the design and engineering of Tocardo’s turbines as well as the overall economic and technical trade-offs in making the turbines work over the long run.
The podcast recommendations page I mention on the show is here.
Introduction
00:04:53Marine current power | Tocardo International BV | Video showing Tocardo turbines | Pieter de Haas | Types of tidal power | Renewable energy | NIMBY (Not In My Back Yard) | Community wind energy
Tidal stream generators
00:14:08Horizontal axis turbine | Francis turbine | Vertical axis turbine | Far field effect | Mass spring effect | Wake | Power = force x velocity | Turbine | Rotor | PTO (power take-off) | Generator | Housing/Nacelle
Installation site
00:21:31Tide | Tide prediction | Tidal currents | Ebb and flood | Ebb and flow | Lunar cycle | Spring and neap tides | Electrical grid | Weather effects | Direct drive | Permanent magnet generator | Frequency converter | Hydraulic Brake | Semi-submersible | Orbital wave motion | Feed-in tariff | Ocean current | Off-the-grid | Distributed generation
Environment
00:44:36Sea creatures avoid strong currents | Tip speed 20m/s vs 80m/s in wind turbines | Increase speed for efficiency when currents deter creatures | Fixed pitch turbine for reliability instead of variable pitch | Speed is measured by frequency converters | Speed is controlled by frequency converters by varying amount of energy harvested (Balance efficiency vs reliability - aim for reliability and minimise risk) | Numerical modelling | Model for energy output, reliability & engineering cost | Over-engineer | 60 tones thrust load | 150 tonne-meter torque | Economic engineering | Emerging technology | Rare-earth magnet | Superconductivity | Cost of energy increasing | Future turbine cost reduction expected | Extreme fatigue | Material curve | Currently 35% efficient | Efficiency currently acceptable | Bi-blade patent | Blade direction is flipped by reverse-powering the generator as a motor
Maintenance
01:10:00Aim for zero maintenance of underwater components | Remote monitoring and reconfiguration | Predictive maintenance | Annual inspection initially | Ducted turbine
About Tocardo
01:14:3910 turbines currently running & connected to the grid | Turbines running up to 8 years so far | All running in the Netherlands | Type T1 6m blade diameter 110kw | Type T2 10m blade diameter 235kw | Mission is to manufacture and service turbines | 25 employees
Development
01:19:36Prototypes | Floating venturi turbine | Ring generator | Three blades | Two blades | Supply chain | Base load | Commercial pilot project
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Klasse Intro !
Ich wünsche dir und Nora friedliche Tage , .. und schöne Weihnachten und ein gutes neues Jahr .
Danke, Dir auch :-)
Danke für die neue Folge. Diese Technologie ist schon sehr faszinierend und ich persönlich sehe in ihr ein enormes Potenzial für die Zukunft. Es wäre allerdings schön gewesen noch mehr zum Aspekt der Umweltverträglichkeit zu hören. Insbesondere hinsichtlich der Auswirkungen durch Schallemissionen und in wie weit das auch Gegenstand der Forschung ist. Es ist bekannt, dass der globale Schiffsverkehr die Meeresbewohner massiv stresst. Stellt man sich nun eine Turbine als stationären “Lautsprecher” vor, der permanent Schall emittiert so ist es durchaus vorstellbar, daß das negative Folgen haben kann.
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Once again you have provided a very interesting interview on a subject I knew nothing about.
Thank you, Markus.