Alaska River In-Stream Energy Conversion (RISEC) Feasibility Study

Transcription

1 Alaska River In-Stream Energy Conversion (RISEC) Feasibility Study Presented by: Roger Bedard EPRI Ocean Energy Leader Contributors Mirko Previsic re-vision consulting LLC Brian Polagye University of Washington Funded by: - Alaska Energy Authority (AEA) - Anchorage Municipal and Light - Chugach Electric - Village of Iguigig

2 Agenda Fundamentals of RISEC Performance Resource Assessment Hydrokinetic Energy Extraction The Project The Concept Device Summary Results of the Study 2

3 Review of Hydro Energy/Power Relationships Potential Energy - energy stored in an object g M h Kinetic Energy - energy associated with moving object Power (P) = (Energy / Time) Kinetic Power (kw) = ½ ρ (density) x A (Area) x V 3 (velocity cubed) V A ρ d M = ρ Ad 3

4 Assessment of River Velocity Distributions For particular USGS River Gaging Station USGS periodically measures river stage, velocity and area and correlates discharge rate to stage height they do not report River Velocity USGS Long-Term River Discharge Rate Hand Calibration Sheets USGS Discharge Rate Frequency Data 4

5 Assessment of Velocity Distributions Velocities are highest near the center and near the surface. Typical peak velocities in the middle of the channel are about 1.3 X the average flow velocity. => Power Density increase of 1.3^3 = 2.2 5

6 Two Types of Water Turbines ~Axial ~Cross Flow Horizontal Axis Vertical Axis and Horizontal Axis Courtesy: Ocean Renewable Power Corp Courtesy: Verdant Power Courtesy: Lucid Energy 6

7 Hydrokinetic Energy Extraction Extraction efficiencies are a function of tip speed ratio Power Coefficient Tip Speed Ratio 7

8 How Electricity is Made from Hydrokinetic Energy using a Turbine Extraction via Rotor Shaft Rotation Speed Increaser Generator Frequency Convertor Step-Up Transformer Water Flow 8

9 Agenda Fundamentals of RISEC Performance Resource Assessment Hydrokinetic Energy Extraction The Project The Concept Device and Design Alternatives Summary Results of the Study 9

10 Alaska RISEC Project Overview Site Assessment of 6 Sites Site Assessment Report Selection of 3 Sites by Funders for System Definition and Feasibility Studies Design, Cost, Performance and Economic Assessment Final Report Reports available at the river page at 10

11 The Sites Site Assessments 11

12 Site Overview Results Largest kinetic power density Largest kinetic power Lowest annual variability 12

13 Conceptual Design Studies Sites Selected 13

14 Iguigig on the Kvichak (in the Summer) 14

15 Whitestone on the Tanana River USGS Station Tanana River Whitestone Town of Big Delta Delta River 15

16 Eagle on the Yukon River 16

17 Agenda Fundamentals of RISEC Performance Resource Assessment Hydrokinetic Energy Extraction The Project The Concept Device and Design Alternatives Summary Results of the Study 17

18 The Concept Device 18

19 Design Alternatives Completely Submersed 19

20 Typical Power Conversion Losses Overall Fluid to wire efficiencies = Power-train efficiency x Rotor Efficiency = > 34% Example of a protective screen 20

21 Some Hydrokinetic Devices In Development Free Flow Power Hydro Green Lucid Technologies New Energy Corp Ocean Renewable Power Corp UEK Corp Verdant Power Vortex Induced Vibrations (VIVACE) 21

22 Agenda Fundamentals of RISEC Performance Resource Assessment Hydrokinetic Energy Extraction The Project The Concept Device and Design Alternatives Summary Results of the Study 22

23 RISEC Resources Seasonal Variability Monthly average velocity (m/s) Monthly average power density (kw/m^3) Eagle Whitestone Iguigig Month Eagle Whitestone Iguigig Month 23

24 Summary 24

25 Thank you Roger Bedard EPRI Results available at the river page at Phone:

26 Some Hydrokinetic Devices In Development Free Flow Power Hydro Green Lucid Technologies New Energy Corp Ocean Renewable Power Corp UEK Corp Verdant Power Vortex Induced Vibrations (VIVACE) 26

27 Free Flow Power 27

28 Hydro Green 28

29 Lucid Technologies 29

30 New Energy Corp 30

31 Ocean Renewable Power Corp 31

32 UEK Corp 32

33 Verdant Power 33

34 Vortex Induced Vibrations (VIVACE) VIVACE converts hydrokinetic energy to transverse mechanical energy 34