Electrical damping of linear generators for wave energy converters—A review

Ekström, Rickard; Ekergård, Boel; Leijon, Mats

doi:10.1016/j.rser.2014.10.010

Cited by 65 publications

(37 citation statements)

References 75 publications

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“…In order to increase the power absorbed by a wave energy conversion unit, different control and damping strategies can be used [4,34]. The L12 is designed to be installed together with a passive resonance-rectifier, which is an electrical damping circuit.…”

Section: Parametermentioning

confidence: 99%

Partial Stator Overlap in a Linear Generator for Wave Power: An Experimental Study

Frost

Ulvgård

Sjökvist

et al. 2017

JMSE

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This paper presents a study on how the power absorption and damping in a linear generator for wave energy conversion are affected by partial overlap between stator and translator. The theoretical study shows that the electrical power as well as the damping coefficient change quadratically with partial stator overlap, if inductance, friction and iron losses are assumed independent of partial stator overlap or can be neglected. Results from onshore experiments on a linear generator for wave energy conversion cannot reject the quadratic relationship. Measurements were done on the inductance of the linear generator and no dependence on partial stator overlap could be found. Simulations of the wave energy converter's operation in high waves show that entirely neglecting partial stator overlap will overestimate the energy yield and underestimate the peak forces in the line between the buoy and the generator. The difference between assuming a linear relationship instead of a quadratic relationship is visible but small in the energy yield in the simulation. Since the theoretical deduction suggests a quadratic relationship, this is advisable to use during modeling. However, a linear assumption could be seen as an acceptable simplification when modeling since other relationships can be computationally costly.

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Section: Parametermentioning

confidence: 99%

Partial Stator Overlap in a Linear Generator for Wave Power: An Experimental Study

Frost

Ulvgård

Sjökvist

et al. 2017

JMSE

Self Cite

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“…The PTO system discussed in this paper is confined to a linear generator using all-electric conversion. 3 To make system modelling more efficient and less complicated, one solution is to create a common language for modelling. This paper tries to utilize the electric circuit as a bridge to connect the hydrodynamics and PTO system.…”

Section: Introductionmentioning

confidence: 99%

Modelling a point absorbing wave energy converter by the equivalent electric circuit theory: A feasibility study

Hai

Svensson

Isberg

et al. 2015

Journal of Applied Physics

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There is a need to have a reliable tool to quickly assess wave energy converters (WECs). This paper explores whether it is possible to apply the equivalent electric circuit theory as an evaluation tool for point absorbing WEC system modelling. The circuits were developed starting from the force analysis, in which the hydrodynamic, mechanical, and electrical parameters were expressed by electrical components. A methodology on how to determine the parameters for electrical components has been explained. It is found that by using a multimeter, forces in the connection line and the absorbed electric power can be simulated and read directly from the electric circuit model. Finally, the circuit model has been validated against the full scale offshore experiment. The results indicated that the captured power could be predicted rather accurately and the line force could be estimated accurately near the designed working condition of the WEC.

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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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Electrical damping of linear generators for wave energy converters—A review

Cited by 65 publications

References 75 publications

Partial Stator Overlap in a Linear Generator for Wave Power: An Experimental Study

Partial Stator Overlap in a Linear Generator for Wave Power: An Experimental Study

Modelling a point absorbing wave energy converter by the equivalent electric circuit theory: A feasibility study

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

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