Pneumatic Power Regulation by Wave Forecasting and Real-Time Relief Valve Control for an OWC

Kieran Monk, Daniel Conley, Miguel Lopes, Qingping Zou

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The shore mounted “Pico” OWC has a relief valve mounted in parallel to the turbine which connects the chamber to the atmosphere. The aperture of this valve is adjustable and can be used to regulate the pneumatic power exposed to the turbine. Here we develop an algorithm to actively control the relief valve aperture so that the peak pneumatic power of each wave cycle approaches but does not breach the turbine stall threshold, thus providing the maximum pneumatic power possible without the turbine stalling. The relief valve aperture is slow to adjust so the hydrodynamic and pneumatic behaviour is forecasted to allow enough time to achieve the correct aperture before the wave reaches the chamber. The chamber hydrodynamics are forecasted using a neural network that considers hydrodynamic measurements made 60 meters up wave and other operational, environmental and preceding wave, parameters. Turbine stalls were identified approximately by the gradient in turbine vibration and the angular velocity dependent pneumatic power threshold for turbine stall is found empirically. The relationship between the forecasted chamber hydrodynamics, relief valve aperture and the resultant pneumatic behaviour, is also found empirically and this is used to select the relief valve aperture that the control algorithm targets.
Original languageEnglish
Title of host publicationThe 10th European Wave and Tidal Energy Conference (EWTEC 2013)
Place of PublicationAalborg, Denmark
PublisherTechnical Committee of the European Wave and Tidal Energy Conference
Publication statusPublished - 2013

Publication series

NameEuropean Wave and Tidal Energy Conference Series
ISSN (Electronic)2309-1983

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turbine
relief
hydrodynamics
regulation
vibration
atmosphere

Cite this

Monk, K., Conley, D., Lopes, M., & Zou, Q. (2013). Pneumatic Power Regulation by Wave Forecasting and Real-Time Relief Valve Control for an OWC. In The 10th European Wave and Tidal Energy Conference (EWTEC 2013) (European Wave and Tidal Energy Conference Series). Aalborg, Denmark: Technical Committee of the European Wave and Tidal Energy Conference.
Monk, Kieran ; Conley, Daniel ; Lopes, Miguel ; Zou, Qingping. / Pneumatic Power Regulation by Wave Forecasting and Real-Time Relief Valve Control for an OWC. The 10th European Wave and Tidal Energy Conference (EWTEC 2013). Aalborg, Denmark : Technical Committee of the European Wave and Tidal Energy Conference, 2013. (European Wave and Tidal Energy Conference Series).
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title = "Pneumatic Power Regulation by Wave Forecasting and Real-Time Relief Valve Control for an OWC",
abstract = "The shore mounted “Pico” OWC has a relief valve mounted in parallel to the turbine which connects the chamber to the atmosphere. The aperture of this valve is adjustable and can be used to regulate the pneumatic power exposed to the turbine. Here we develop an algorithm to actively control the relief valve aperture so that the peak pneumatic power of each wave cycle approaches but does not breach the turbine stall threshold, thus providing the maximum pneumatic power possible without the turbine stalling. The relief valve aperture is slow to adjust so the hydrodynamic and pneumatic behaviour is forecasted to allow enough time to achieve the correct aperture before the wave reaches the chamber. The chamber hydrodynamics are forecasted using a neural network that considers hydrodynamic measurements made 60 meters up wave and other operational, environmental and preceding wave, parameters. Turbine stalls were identified approximately by the gradient in turbine vibration and the angular velocity dependent pneumatic power threshold for turbine stall is found empirically. The relationship between the forecasted chamber hydrodynamics, relief valve aperture and the resultant pneumatic behaviour, is also found empirically and this is used to select the relief valve aperture that the control algorithm targets.",
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year = "2013",
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publisher = "Technical Committee of the European Wave and Tidal Energy Conference",
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Monk, K, Conley, D, Lopes, M & Zou, Q 2013, Pneumatic Power Regulation by Wave Forecasting and Real-Time Relief Valve Control for an OWC. in The 10th European Wave and Tidal Energy Conference (EWTEC 2013). European Wave and Tidal Energy Conference Series, Technical Committee of the European Wave and Tidal Energy Conference, Aalborg, Denmark.

Pneumatic Power Regulation by Wave Forecasting and Real-Time Relief Valve Control for an OWC. / Monk, Kieran; Conley, Daniel; Lopes, Miguel; Zou, Qingping.

The 10th European Wave and Tidal Energy Conference (EWTEC 2013). Aalborg, Denmark : Technical Committee of the European Wave and Tidal Energy Conference, 2013. (European Wave and Tidal Energy Conference Series).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Pneumatic Power Regulation by Wave Forecasting and Real-Time Relief Valve Control for an OWC

AU - Monk, Kieran

AU - Conley, Daniel

AU - Lopes, Miguel

AU - Zou, Qingping

PY - 2013

Y1 - 2013

N2 - The shore mounted “Pico” OWC has a relief valve mounted in parallel to the turbine which connects the chamber to the atmosphere. The aperture of this valve is adjustable and can be used to regulate the pneumatic power exposed to the turbine. Here we develop an algorithm to actively control the relief valve aperture so that the peak pneumatic power of each wave cycle approaches but does not breach the turbine stall threshold, thus providing the maximum pneumatic power possible without the turbine stalling. The relief valve aperture is slow to adjust so the hydrodynamic and pneumatic behaviour is forecasted to allow enough time to achieve the correct aperture before the wave reaches the chamber. The chamber hydrodynamics are forecasted using a neural network that considers hydrodynamic measurements made 60 meters up wave and other operational, environmental and preceding wave, parameters. Turbine stalls were identified approximately by the gradient in turbine vibration and the angular velocity dependent pneumatic power threshold for turbine stall is found empirically. The relationship between the forecasted chamber hydrodynamics, relief valve aperture and the resultant pneumatic behaviour, is also found empirically and this is used to select the relief valve aperture that the control algorithm targets.

AB - The shore mounted “Pico” OWC has a relief valve mounted in parallel to the turbine which connects the chamber to the atmosphere. The aperture of this valve is adjustable and can be used to regulate the pneumatic power exposed to the turbine. Here we develop an algorithm to actively control the relief valve aperture so that the peak pneumatic power of each wave cycle approaches but does not breach the turbine stall threshold, thus providing the maximum pneumatic power possible without the turbine stalling. The relief valve aperture is slow to adjust so the hydrodynamic and pneumatic behaviour is forecasted to allow enough time to achieve the correct aperture before the wave reaches the chamber. The chamber hydrodynamics are forecasted using a neural network that considers hydrodynamic measurements made 60 meters up wave and other operational, environmental and preceding wave, parameters. Turbine stalls were identified approximately by the gradient in turbine vibration and the angular velocity dependent pneumatic power threshold for turbine stall is found empirically. The relationship between the forecasted chamber hydrodynamics, relief valve aperture and the resultant pneumatic behaviour, is also found empirically and this is used to select the relief valve aperture that the control algorithm targets.

M3 - Conference contribution

T3 - European Wave and Tidal Energy Conference Series

BT - The 10th European Wave and Tidal Energy Conference (EWTEC 2013)

PB - Technical Committee of the European Wave and Tidal Energy Conference

CY - Aalborg, Denmark

ER -

Monk K, Conley D, Lopes M, Zou Q. Pneumatic Power Regulation by Wave Forecasting and Real-Time Relief Valve Control for an OWC. In The 10th European Wave and Tidal Energy Conference (EWTEC 2013). Aalborg, Denmark: Technical Committee of the European Wave and Tidal Energy Conference. 2013. (European Wave and Tidal Energy Conference Series).