CONTROL TECHNIQUES FOR WAVE ENERGY CONVERTERS

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Optimal phase control in random waves requires the prediction of incoming wave and heavy computing. Sub-optimal control strategies by latching were devised by several teams. Usually, control algorithm determines the duration of time the oscillator is kept fixed (latched) in each wave cycle. Alternative strategy is in terms of load (not time duration): Opposing force to be overcome before the body is released.
Numerical simulations of phase control Sphere radius 5 m Gas (Nitrogen): • accumulator: 100 kg • turbine casing: 20 kg qm ( t) G S c p S c 0.0314 m 2 (diameter 200 mm) Phase-control by latching: body is released when hydrodynam ic force on body exceeds R( S c p) ( R 1) Control parameters: G controls oil flow rate through hydraulic motor R controls latching (release of body)
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 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: Oscillating-body dynamics Phase-con
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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