Tidal current energy From water currents to electric energy

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Presentation transcript:

Tidal current energy From water currents to electric energy Johan Forslund johan.forslund@angstrom.uu.se 1 1

Chapter 1: Renewable energies - Marine Current Power Chapter 2: Marine Current Power at Uppsala University

The road of electricity production and consumption: Transform and consume Transform and transmit Convert to electricity Power absorption Resource

Chapter 1: Renewable energies

Intermittency in renewable Energy Intermittency is the time scale of natural variation for different renewable energy sources that we can not regulate. Solar radiation – may vary within seconds as well as during day and night, summer and winter Wind – may vary within minutes, seasonal changes Wave – May vary within hours, seasonal changes Tidal – tidal cycle of twice a day Hydro - stock pile energy, seasonal changes 5

Technology for tidal current energy conversion – turbine concepts Vertical axis Horizontal axis Oscillating hydrofoils Horizontal axis Kobold turbine (Italy) Operating since 2001 Power= 25 kW Hammerfest Ström (Norway) Operating since 2003 Power = 300 kW The Stingray (UK), briefly operated during 2003, 150 kW Open Hydro (Scotland) Deployed 2009 1 MW 6

The tidal barrage La Rance Photo: Wikipedia 21st July 2017: Low tide at 00.09: 2.90 m High tide at 05.48: 10.7 m Low tide at 12.40: 2.6 m High tide at 18.17: 11.20 7

The tidal barrage La Rance 8 Photos: Johan Forslund

The tidal barrage La Rance Kaplan- turbine Photos: Johan Forslund 9

The tidal barrage La Rance Photo: Johan Forslund 10

Tidal resource – Sites for tidal barrages Mean Tidal Amplitude (m) Basin Area (km2) La Rance, France 4 22.5 Annapolis Royal, Nova Scotia 3.2 6 Severn Estuary, Great Britain 420 Sihwa Lake, South Korea 30 Bay of Fundy, Canada 5.5 29000 Compare with one nuclear power plant (One Ringhals ~6.5 TWh/year) and Number of homes it supplies Electric Energy [TWh/year] # of nuclear power plants # homes (thousands) La Rance, France 0.54 0.083 167 Annapolis Royal, Nova Scotia 0.05 0.008 16 Severn Estuary, Great Britain 6.67 1.026 2067 Sihwa Lake, South Korea 1.07 0.165 331 Bay of Fundy, Canada 871.68 134.105 301220 11

Chapter 2: Marine Current Power - Uppsala University

The Söderfors Site - Marine Current Power (MCP) at UU The concept is focused around a vertical axis turbine and a direct drive PM generator - a simple and robust system with few moving parts Vertical axis turbine Generator 13

The experimental site in Söderfors 14

The MCP generator 15

The MCP turbine 16

Thank you for your attention Pictures and information about the companies and their prototypes can be found at the following websites Marine current turbines - http://www.marineturbines.com Open Hydro - http://www.openhydro.com Atlantis - http://www.atlantisresourcescorporation.com Kobold Turbine - http://www.pontediarchimede.com Lunar Energy - http://www.lunarenergy.co.uk Hammerfest Ström - http://www.hammerfeststrom.com Clean Current - http://www.cleancurrent.com Race Rocks - http://www.racerocks.com Swan Turbines - http://www.swanturbines.co.uk Verdant Power - http://verdantpower.com … and there are several more prototypes around! 17

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