A novel maximum power point tracking algorithm for ocean wave energy devices

Amon, Ean; Schacher, Al; Brekken, Ted K. A.

doi:10.1109/ecce.2009.5316277

Cited by 22 publications

(19 citation statements)

References 5 publications

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“…whereĈ W k is the estimate of the mean OWC capture width at sample k. Both the discrete MPPT and MCWT algorithms have two independent degrees of freedom; the update rate and the step size (Amon et al, 2009(Amon et al, , 2012. The update rate controls the rate at which the controller responds to changes in the mean power/ capture width estimate, and hence changes in incident wave conditions.…”

Section: Maximum Power Point/capture Width Tracking Algorithmsmentioning

confidence: 99%

“…Maximum power point tracking (MPPT), a gradient-ascent type method commonly used in wind and solar energy converters, has been investigated for adaptive PTO control in a WEC (Amon et al, 2009(Amon et al, , 2012, where the load resistance of a linear generator was tuned by varying the duty cycle of a buck converter. The investigation considered a surface following WEC, effectively neglecting hydrodynamics, and focused on the effects of varying the update rate and step size of the MPPT algorithm on the average power output for a single sea state.…”

Section: Introductionmentioning

confidence: 99%

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A maximum capture width tracking controller for ocean wave energy converters in irregular waves

et al. 2016

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Section: Maximum Power Point/capture Width Tracking Algorithmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A maximum capture width tracking controller for ocean wave energy converters in irregular waves

et al. 2016

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“…In addition to reactive, latching, and declutching control, a variety of other control strategies have been explored, including model predictive control (MPC) [29], multiple power-point tracking (a strategy often used in solar energy systems) [30], PID [31], and feedback linearization [31].…”

Section: Wave Energy Converter Controlmentioning

confidence: 99%

Wave Energy Extraction Maximization Using Direct Transcription

Allison

Kaitharath

Herber

2012

Volume 3: Design, Materials and Manufacturing, Parts A, B, and C

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Wave energy converters (WECs) extract energy from the motion of ocean waves. A variety of different WEC devices have been studied over the past several decades, with emphasis on cost-effective energy extraction. Active control has been shown to improve energy production significantly. Here we investigate energy extraction potential of a tethered heaving cylinder WEC using direct transcription (DT), an open-loop optimal control strategy. This enables direct inclusion of asymmetric constraints on power and tether force, practical considerations not considered in previous studies, and opens the door to WEC optimal control problems with more realistic nonlinear models and integration of control design with physical system design.

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“…It will be shown in the following, however, that this can lead to mislead the conclusions when real waves are considered. On the other hand, some studies on practical techniques to improve power performance have also been proposed, but being limited to few very specific applications, without necessarily claim to generality [5][6][7].…”

Section: Introductionmentioning

confidence: 98%

Analysis of power extraction from irregular waves by all-electric power take off

Tedeschi

Molinas

Carraro

et al. 2010

2010 IEEE Energy Conversion Congress and Exposition

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The choice of the most suitable control strategy for Wave Energy Converters (WECs) is often evaluated with reference to the sinusoidal assumption for incident waves. Under this hypothesis, linear techniques for the control of the extracted power, as passive loading and optimum control are well-known and widely analyzed. It can be shown, however, how their performances are fundamentally different when irregular waves are considered and the theoretical superiority of optimum control is questionable under real wave conditions. Moreover, the global optimization of WECs requires a rational design of the power electronics equipment. This requires the analysis of the instantaneous extracted power in addition to the average one. In this paper the impact of irregular waves on the power extraction when using different control techniques is analyzed in the case of a point absorber in heave. It is also shown how a convenient trade-off between high average power extraction and limited power electronics overrating can be obtained by applying simple power saturation techniques. Moreover, the impact of power conversion efficiency on the control strategy is analyzed.

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A novel maximum power point tracking algorithm for ocean wave energy devices

Cited by 22 publications

References 5 publications

A maximum capture width tracking controller for ocean wave energy converters in irregular waves

A maximum capture width tracking controller for ocean wave energy converters in irregular waves

Wave Energy Extraction Maximization Using Direct Transcription

Analysis of power extraction from irregular waves by all-electric power take off

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