Comparative assessment of control strategies for the biradial turbine in the Mutriku OWC plant

Faÿ, François-Xavier; Henriques, J.C.C.; Kelly, James Floyd; Mueller, Markus; Abusara, Mohammad; Sheng, Wanan; Marcos, Marga

doi:10.1016/j.renene.2019.08.074

Cited by 26 publications

(12 citation statements)

References 37 publications

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“…The same HIL test rig has been applied to develop other WECs with high Technological Readiness Level (e.g., for the development of different WECs named REWEC3, OWC Spar-buoy, Ocean Energy buoy, and ISWEC [19,22]). Good results were also obtained to set a predictive control for the full-scale biradial turbine of the Mutriku OWC plant [27] .…”

Section: Hil Test Benchmentioning

confidence: 97%

“…The usefulness of the HIL test rig is in fact demonstrated not only by the study case of this work, but also by the works in [19] and [22] for different WECs at the design stage. More recently, it has been validated also for a real [27], but it was never defined and structured as in the present work. The proposed procedure, schematically presented in Figure 1, has been described also with an example, considering some iterations to improve the power at the output of the generator.…”

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confidence: 99%

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confidence: 99%

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An Iterative Refining Approach to Design the Control of Wave Energy Converters with Numerical Modeling and Scaled HIL Testing

et al. 2020

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The aim of this work is to show that a significant increase of the efficiency of a Wave Energy Converter (WEC) can be achieved already at an early design stage, through the choice of a turbine and control regulation, by means of an accurate Wave-to-Wire (W2W) modeling that couples the hydrodynamic response calibrated in a wave flume to a Hardware-In-the-Loop (HIL) test bench with sizes and rates not matching those of the system under development. Information on this procedure is relevant to save time, because the acquisition, the installation, and the setup of a test rig are not quick and easy. Moreover, power electronics and electric machines to emulate turbines and electric generators matching the real systems are not low-cost equipment. The use of HIL is important in the development of WECs also because it allows the carrying out of tests in a controlled environment, and this is again time- and money-saving if compared to tests done on a real system installed at the sea. Furthermore, W2W modeling can be applied to several Power Take-Off (PTO) configurations to experiment different control strategies. The method here proposed, concerning a specific HIL for testing power electronics and control laws for a specific WECs, may have a more general validity.

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Section: Hil Test Benchmentioning

confidence: 97%

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confidence: 99%

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An Iterative Refining Approach to Design the Control of Wave Energy Converters with Numerical Modeling and Scaled HIL Testing

et al. 2020

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“…A wave-to-wire model was proposed for one chamber of the plant and the effects of the control strategies on the energy conversion and power output quality and reliability were evaluated in irregular sea states. A set of adaptive and predictive algorithms was considered and both turbine speed controllers and latching strategies were analyzed and validated utilizing an electrical test infrastructure [71].…”

Section: Owc Wave-to-wire Literature Reviewmentioning

confidence: 99%

Wave-to-Wire Model of an Oscillating-Water-Column Wave Energy Converter and Its Application to Mediterranean Energy Hot-Spots

et al. 2020

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Oscillating water column (OWC) systems are among the most credited solutions for an effective conversion of the notable energy potential conveyed by sea waves. Despite a renewed interest, however, they are often still at a demonstration phase and additional research is required to reach industrial maturity. Within this framework, this study provides a wave-to-wire model for OWC systems based on an impulse air turbine. The model performs a comprehensive simulation of the system to estimate the attendant electric energy production for a specific sea state, based on analytical models of the primary (fixed chamber) and secondary (air turbine) converters coupled with the tertiary converter (electric generator). A rigid piston model is proposed to solve the hydrodynamics, thermodynamics, and hydrodynamics of the chamber, in a coupled fashion with the impulse turbine aerodynamics. This is solved with a novel method by considering the cascades as sets of blades, each one consisting of a finite number of airfoils stacked in the radial direction. The model was applied for two Mediterranean sites located in Tuscany and Sardinia (Italy), which were selected to define the optimal geometry of the turbine for a specified chamber. For each system, the developed analytical wave-to-wire model was applied to calculate the performance parameters and the annual energy production in environmental conditions typical of the Mediterranean Sea. The selected impulse turbines are able to convert 13.69 and 39.36 MWh/year, with an efficiency of 4.95% and 4.76%, respectively, thus proving the interesting prospects of the technology.

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“…Moreover, no power is required from the grid and energy only flows in one direction. For example, a nearly identical strategy to the MPPT control was used as a base case control strategy for comparing more complex control algorithms during sea trials of a OWC device in [21].…”

Section: Generator Model Bypass Valve and Control Lawmentioning

confidence: 99%

Wave-to-Wire Model Development and Validation for Two OWC Type Wave Energy Converters

et al. 2019

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The Tupperwave device is a closed-circuit oscillating water column (OWC) wave energy converter that uses non-return valves and two large fixed-volume accumulator chambers to create a smooth unidirectional air flow, harnessed by a unidirectional turbine. In this paper, the relevance of the Tupperwave concept against the conventional OWC concept, that uses a self-rectifying turbine, is investigated. For this purpose, wave-to-wire numerical models of the Tupperwave device and a corresponding conventional OWC device are developed and validated against experimental tests. Both devices have the same floating spar buoy structure and a similar turbine technology. The models include wave-structure hydrodynamic interaction, air turbines and generators, along with their control laws in order to encompass all power conversion stages from wave to electrical power. Hardware-in-the-loop is used to physically emulate the last power conversion stage from mechanic to electrical power and hence validate the control law and the generator numerical model. The dimensioning methodology for turbines and generators for power optimisation is explained. Eventually, the validated wave-to-wire numerical models of the conventional OWC and the Tupperwave device are used to assess and compare the performances of these two OWC type wave energy device concepts in the same wave climate. The benefits of pneumatic power smoothing by the Tupperwave device are discussed and the required efficiency of the non-return valves is investigated.

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Comparative assessment of control strategies for the biradial turbine in the Mutriku OWC plant

Cited by 26 publications

References 37 publications

An Iterative Refining Approach to Design the Control of Wave Energy Converters with Numerical Modeling and Scaled HIL Testing

An Iterative Refining Approach to Design the Control of Wave Energy Converters with Numerical Modeling and Scaled HIL Testing

Wave-to-Wire Model of an Oscillating-Water-Column Wave Energy Converter and Its Application to Mediterranean Energy Hot-Spots

Wave-to-Wire Model Development and Validation for Two OWC Type Wave Energy Converters

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