Control, power and electrical components in wave energy conversion systems: A review of the technologies

Ozkop, E.; Altaş, İsmail H.

doi:10.1016/j.rser.2016.09.012

Cited by 127 publications

(49 citation statements)

References 140 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%

“…Due to the high forces and the slow and highly variable speed in alternating directions, the power captured by the point absorber cannot be connected to any conventional rotating generator, without adding an intermediate conversion step, which will add to system complexity and system loss. A linear generator can take advantage of the heave motion of the wave and therefore linear generators are used in several different wave energy converters [4][5][6][7]. Drawbacks with linear generators for wave power is that they become very large due to the high forces and low velocities [8,9] and that the induced voltage varies in both frequency and amplitude [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

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

Frost

Ulvgård

Sjökvist

et al. 2017

JMSE

View full text Add to dashboard Cite

show abstract

“…Moreover, different classifications can be found in the literature, according to different reviews of recently published wave energy converter technologies [3,4,38,39,[43][44][45][46][47][48][49][50][51][52][53]. Often, wave energy converters are classified according to the criteria listed below [3,4,37,39,[43][44][45][46]50,53].…”

Section: Main Technologies Currently Usedmentioning

confidence: 99%

“…A review of electrical generators used, control methods employed, mechanical and/or electrical controllers applied, wave conditions considered, and power electronic converters used for different projects is proposed by E. Ozkop and I.H. Altas [52]. Classification by the power take-off technology (second conversion stage) is also given in [46], resulting in three main sub-categories: the hydraulic PTO, the turbine PTO, and the all-electric PTO, as discussed in the previous Section.…”

mentioning

confidence: 99%

Electrical Power Supply of Remote Maritime Areas: A Review of Hybrid Systems Based on Marine Renewable Energies

et al. 2018

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Abstract:Ocean energy holds out great potential for supplying remote maritime areas with their energy requirements, where the grid size is often small and unconnected to a continental grid. Thanks to their high maturity and competitive price, solar and wind energies are currently the most used to provide electrical energy. However, their intermittency and variability limit the power supply reliability. To solve this drawback, storage systems and Diesel generators are often used. Otherwise, among all marine renewable energies, tidal and wave energies are reaching an interesting technical level of maturity. The better predictability of these sources makes them more reliable than other alternatives. Thus, combining different renewable energy sources would reduce the intermittency and variability of the total production and so diminish the storage and genset requirements. To foster marine energy integration and new multisource system development, an up-to-date review of projects already carried out in this field is proposed. This article first presents the main characteristics of the different sources which can provide electrical energy in remote maritime areas: solar, wind, tidal, and wave energies. Then, a review of multi-source systems based on marine energies is presented, concerning not only industrial projects but also concepts and research work. Finally, the main advantages and limits are discussed.

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“…Since the 1970s, many wave energy conversion (WEC) types have been designed and studied by researchers from all over the world [1,2]. At present, the many types of WEC include oscillating water columns and floaters, the Wave Dragon, and the Pelamis [3,4]. Traditional WEC systems convert wave energy into mechanical energy by hydraulic devices or air turbines and then convert mechanical energy into electrical energy by rotary electrical machines [5,6].…”

Section: Introductionmentioning

confidence: 99%

Design and Experiment Analysis of a Direct-Drive Wave Energy Converter with a Linear Generator

Zhang

2018

Energies

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Abstract:Coastal waves are an abundant nonpolluting and renewable energy source. A wave energy converter (WEC) must be designed for efficient and steady operation in highly energetic ocean environments. A direct-drive wave energy conversion (D-DWEC) system with a tubular permanent magnet linear generator (TPMLG) on a wind and solar photovoltaic complementary energy generation platform is proposed to improve the conversion efficiency and reduce the complexity and device volume of WECs. The operating principle of D-DWECs is introduced, and detailed analyses of the proposed D-DWEC's floater system, wave force characteristics, and conversion efficiency conducted using computational fluid dynamics are presented. A TPMLG with an asymmetric slot structure is designed to increase the output electric power, and detailed analyses of the magnetic field distribution, detent force characteristics, and no-load and load performances conducted using finite element analysis are discussed. The TPMLG with an asymmetric slot, which produces the same power as the TPMLG with a symmetric slot, has one fifth detent force of the latter. An experiment system with a prototype of the TPMLG with a symmetric slot is used to test the simulation results. The experiment and analysis results agree well. Therefore, the proposed D-DWEC fulfills the requirements of WEC systems.

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Control, power and electrical components in wave energy conversion systems: A review of the technologies

Cited by 127 publications

References 140 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

Electrical Power Supply of Remote Maritime Areas: A Review of Hybrid Systems Based on Marine Renewable Energies

Design and Experiment Analysis of a Direct-Drive Wave Energy Converter with a Linear Generator

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