Nonlinear Passive Control of a Wave Energy Converter Subject to Constraints in Irregular Waves

Wang, Liguo; Isberg, Jan

doi:10.3390/en8076528

Cited by 44 publications

(20 citation statements)

References 36 publications

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“…The influence of the PTO damping on the energy conversion has been demonstrated in some literatures [21,[23][24][25]. In [25], experimental results from single WEC indicate that different constant PTO damping results in different power production in the same sea states.…”

Section: Introductionmentioning

confidence: 91%

Coordinated Control of Wave Energy Converters Subject to Motion Constraints

et al. 2016

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Abstract:In this paper, a generic coordinated control method for wave energy converters is proposed, and the constraints on motion amplitudes and the hydrodynamic interaction between converters are considered. The objective of the control problem is to maximize the energy converted from ocean waves, and this is achieved by coordinating the power take-off (PTO) damping of each wave energy converter in the frequency domain in each sea state. In a case study, a wave energy farm consisting of four converters based on the concept developed by Uppsala University is studied. In the solution, motion constraints, including constraints on the amplitudes of displacement and velocity, are included. Twelve months of sea states, based on measured wave data at the Lysekil test site on the Swedish west coast, are used in the simulation to evaluate the performance of the wave energy farm using the new method. Results from the new coordinated control method and traditional control method are compared, indicating that the coordinated control of wave energy converters is an effective way to improve the energy production of wave energy farm in harmonic waves.

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Section: Introductionmentioning

confidence: 91%

Coordinated Control of Wave Energy Converters Subject to Motion Constraints

et al. 2016

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“…Instead, positive effects, such as artificial reefs, were observed [37,38]. Other recent studies on the same WEC concept include control strategies, compensations for tides and discussions on the design of wave power farms with several WECs [39][40][41]. Figure 1.…”

Section: The Uu-wec Technologymentioning

confidence: 99%

Wave Power as Solution for Off-Grid Water Desalination Systems: Resource Characterization for Kilifi-Kenya

et al. 2018

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Abstract:Freshwater scarcity is one of humanity's reoccurring problems that hamper socio-economic development in many regions across the globe. In coastal areas, seawater can be desalinated through reverse osmosis (RO) and transformed into freshwater for human use. Desalination requires large amounts of energy, mostly in the form of a reliable electricity supply, which in many cases is supplied by diesel generators. The objective of this work is to analyze the wave power resource availability in Kilifi-Kenya and evaluate the possible use of wave power converter (WEC) to power desalination plants. A particular focus is given use of WECs developed by Uppsala University (UU-WEC). The results here presented were achieved using reanalysis-wave data revealed that the local wave climate has an approximate annual mean of 7 kW/m and mode of 5 kW/m. Significant wave height and wave mean period are within 0.8-2 m and 7-8 s respectively, with a predominant wave mean direction from southeast. The seasonal cycle appeared to be the most relevant for energy conversion, having the highest difference of 6 kW/m, in which April is the lowest (3.8 kW/m) and August is the peak (10.5 kW/m). In such mild wave climates, the UU-WEC and similar devices can be suitable for ocean energy harvesting for water desalination systems. Technically, with a capacity factor of 30% and energy consumption of 3 kWh/m 3 , a coastal community of about five thousand inhabitants can be provided of freshwater by only ten WECs with installed capacity of 20 kW.

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“…The influence of the PTO damping on the energy conversion has been investigated in [36] for regular waves and in [37] for irregular waves. The orifice used in the tank test in place of a PTO system may provide constant damping coefficient.…”

Section: Reflection Coefficientmentioning

confidence: 99%

Wave Energy Exploitation System Integrated in the Coastal Structure of a Mediterranean Port

2016

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A feasibility study for installing Wave Energy Converters (WECs) in a Mediterranean port is presented here. The final aim is to evaluate the possibility of building a green touristic infrastructure in a site having ordinary wave energy. In particular, the site of interest is Giardini Naxos, which is located in the northern Ionian coast of the island of Sicily (Italy). A preliminary estimation of the available energy has been carried out. The chosen type of WEC device is the Oscillating Water Column (OWC) system, which is found here to allow for good integration with the vertical breakwater needed for the extension of the existing port. Its feasibility is evaluated from the structural and economic point of view. Towards this aim, the system is tested in the laboratory for estimating the reflection coefficients and the pressures on the structure, which allow us to carry out the optimization of the OWC breakwater. Furthermore, the air turbine noise is estimated and an attenuation chamber is designed to reduce such noise to within acceptable levels. The economic feasibility study allows for an evaluation of the recuperation period of the investment, which is slightly less than the service life of the WEC device.

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Nonlinear Passive Control of a Wave Energy Converter Subject to Constraints in Irregular Waves

Cited by 44 publications

References 36 publications

Coordinated Control of Wave Energy Converters Subject to Motion Constraints

Coordinated Control of Wave Energy Converters Subject to Motion Constraints

Wave Power as Solution for Off-Grid Water Desalination Systems: Resource Characterization for Kilifi-Kenya

Wave Energy Exploitation System Integrated in the Coastal Structure of a Mediterranean Port

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