CONTROL TECHNIQUES FOR WAVE ENERGY CONVERTERS

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Absorbed power Spectral power density (m 2 s) m Introduction Large body Small body Wave energy absorption is widerbanded for a large body than for a “point-absorber”. This is relevant for real polychromatic multi-frequency waves. Here smaller oscillating-bodies are less efficient than larger ones. This can be (partially) overcome by control (phase control). Wave frequency 1.5 1 0.5 0 0.5 1 100 200 150 200 250 3 t s 0.2 0.15 0.1 0.05 T e H s 10 s 2m 0 0 0.5 1 1.5 Frequency (rad/s)
Oscillating-body dynamics Most wave energy converters are complex (possibly multi-body) mechanical systems with several degrees of freedom. Buoy We consider first the simplest case: • A single floating body. • One degree of freedom: oscillation in heave (vertical oscilation). Spring PTO Damper
Page 1 and 2: SUPERGEN MARINE 7th DOCTORAL TRAINI
Page 3 and 4: Introduction Technology challenge
Page 5: Introduction The size While, in oth
Page 9 and 10: Oscillating-body dynamics Frequency
Page 11 and 12: Oscillating-body dynamics ( m A) x
Page 13 and 14: Oscillating-body dynamics Capture w
Page 15 and 16: ma Oscillating-body dynamics Exampl
Page 17 and 18: PTO system Body 1 Body 2 WAVEBOB
Page 19 and 20: Oscillating-body dynamics x m Time
Page 21 and 22: PTO Equipment High-pressureoil PTO
Page 23 and 24: PTO Equipment High-pressure-oil PTO
Page 25 and 26: PTO Equipment High-pressure-oil PTO
Page 27 and 28: Oscillating-body dynamics Buoy LP g
Page 29 and 30: Avoid overdamping and underdamping.
Page 31 and 32: CONTROL OF WAVE ENERGY CONVERTER No
Page 33 and 34: CONTROL OF WAVE ENERGY CONVERTER Co
Page 35 and 36: Oscillating-body dynamics For point
Page 37 and 38: Oscillating-body dynamics Phase-con
Page 39 and 40: Numerical simulations of phase cont
Page 41 and 42: REGULAR WAVES Period T = 9 s Amplit
Page 43 and 44: 250 200 P(kW) 150 100 50 G is optim
Page 45 and 46: T e 7 s, Hs 2 m 25 kW P 2 H s m 2 2
Page 47 and 48: T e 11 s, Hs 2 m 30 P 2 H s 20 4 28
Page 49 and 50: d x d t Hs s 1 , 1 0 fd Hs M N m d
Page 51 and 52: Oscillating-body dynamics Phase con
Page 53 and 54: WAVE ENERGY TECHNOLOGIES Oscillatin
Page 55 and 56: IPS Buoy Wave Bob AquaBuoy Hose pum
Page 57 and 58:
Two-body motion, linear PTO Coordin
Page 59 and 60:
Radius of buoy = 7.5 m Mass of buoy
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T 8s T 12 10s 3 2,5 2 1,5 1 0,5 0 2
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T e 8s T e 10s 5 4 3 2 1 0 25 20 15
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T e 8s T e 10s 12s 0,48 0,47 0,46 0
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1a LP gas accumulator HP gas accumu
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Non-linear PTO: time-domain analysi
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0,4 0,3 * P irr 0,2 R=1 R=2 R=4 a M
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0,4 a M M * 2 7.5m * 1b 1 0,3 * P i
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CONCLUSIONS • A two-body system w
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Power output The problem: • The p
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OWC Dynamics m (t) V0 p(t) air volu
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OWC Dynamics Frequency domain m (t)
Page 83 and 84:
OWC Dynamics m (t) Time domain: •
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OWC Dynamics Numerical application
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OWC Dynamics Stochastic modelling W
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OWC Dynamics Stochastic model: •
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Time-averaged turbine power output
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Example: Pico OWC plant with 2.3m W
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Rated power (kW) Annual averaged ne
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THANK YOU FOR YOUR ATTENTION J.M.W.
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CONTROL TECHNIQUES FOR WAVE ENERGY CONVERTERS

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