CONTROL TECHNIQUES FOR WAVE ENERGY CONVERTERS

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Sphere radius a 5m Sphere radius a 5m Sea state H s 3m, T e 11s Sea state H s 3m, T e 11s x (m) Oscillating-body dynamics x (m) x x (m) (m) P (kW) P (kW) P P (kW) Under damped Externalforce 200 kN Optimally damped Externalforce 647 kN Over damped Externalforce 1000 kN P 83.1kW P 178.4 kW P 97.0 kW
Avoid overdamping and underdamping. Recall that accumulator size is finite. How to control the damping level (PTO force or accumulator pressure) to the current sea state (or wave group) Answer: Control the oil flow rate q through hydraulic motor as function of pressure difference Δp Algorithm: q p constant Buoy LP gas HP gas accumulator accumulator Δp q q G S c 2 Δp control piston area parameter Cylinder A B Valve
Page 1 and 2: SUPERGEN MARINE 7th DOCTORAL TRAINI
Page 3 and 4: Introduction Technology challenge
Page 5 and 6: Introduction The size While, in oth
Page 7 and 8: Oscillating-body dynamics Most wave
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: Oscillating-body dynamics Buoy LP g
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
Page 61 and 62: T 8s T 12 10s 3 2,5 2 1,5 1 0,5 0 2
Page 63 and 64: T e 8s T e 10s 5 4 3 2 1 0 25 20 15
Page 65 and 66: T e 8s T e 10s 12s 0,48 0,47 0,46 0
Page 67 and 68: 1a LP gas accumulator HP gas accumu
Page 69 and 70: Non-linear PTO: time-domain analysi
Page 71 and 72: 0,4 0,3 * P irr 0,2 R=1 R=2 R=4 a M
Page 73 and 74: 0,4 a M M * 2 7.5m * 1b 1 0,3 * P i
Page 75 and 76: CONCLUSIONS • A two-body system w
Page 77 and 78: Power output The problem: • The p
Page 79 and 80:
OWC Dynamics m (t) V0 p(t) air volu
Page 81 and 82:
OWC Dynamics Frequency domain m (t)
Page 83 and 84:
OWC Dynamics m (t) Time domain: •
Page 85 and 86:
OWC Dynamics Numerical application
Page 87 and 88:
OWC Dynamics Stochastic modelling W
Page 89 and 90:
OWC Dynamics Stochastic model: •
Page 91 and 92:
Time-averaged turbine power output
Page 93 and 94:
Example: Pico OWC plant with 2.3m W
Page 95 and 96:
Rated power (kW) Annual averaged ne
Page 97:
THANK YOU FOR YOUR ATTENTION J.M.W.
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CONTROL TECHNIQUES FOR WAVE ENERGY CONVERTERS

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