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| 2. |
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| 3. |
- Klionsky, Daniel J., et al.
(author)
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Guidelines for the use and interpretation of assays for monitoring autophagy
- 2012
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In: Autophagy. - : Informa UK Limited. - 1554-8635 .- 1554-8627. ; 8:4, s. 445-544
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Research review (peer-reviewed)abstract
- In 2008 we published the first set of guidelines for standardizing research in autophagy. Since then, research on this topic has continued to accelerate, and many new scientists have entered the field. Our knowledge base and relevant new technologies have also been expanding. Accordingly, it is important to update these guidelines for monitoring autophagy in different organisms. Various reviews have described the range of assays that have been used for this purpose. Nevertheless, there continues to be confusion regarding acceptable methods to measure autophagy, especially in multicellular eukaryotes. A key point that needs to be emphasized is that there is a difference between measurements that monitor the numbers or volume of autophagic elements (e.g., autophagosomes or autolysosomes) at any stage of the autophagic process vs. those that measure flux through the autophagy pathway (i.e., the complete process); thus, a block in macroautophagy that results in autophagosome accumulation needs to be differentiated from stimuli that result in increased autophagic activity, defined as increased autophagy induction coupled with increased delivery to, and degradation within, lysosomes (in most higher eukaryotes and some protists such as Dictyostelium) or the vacuole (in plants and fungi). In other words, it is especially important that investigators new to the field understand that the appearance of more autophagosomes does not necessarily equate with more autophagy. In fact, in many cases, autophagosomes accumulate because of a block in trafficking to lysosomes without a concomitant change in autophagosome biogenesis, whereas an increase in autolysosomes may reflect a reduction in degradative activity. Here, we present a set of guidelines for the selection and interpretation of methods for use by investigators who aim to examine macroautophagy and related processes, as well as for reviewers who need to provide realistic and reasonable critiques of papers that are focused on these processes. These guidelines are not meant to be a formulaic set of rules, because the appropriate assays depend in part on the question being asked and the system being used. In addition, we emphasize that no individual assay is guaranteed to be the most appropriate one in every situation, and we strongly recommend the use of multiple assays to monitor autophagy. In these guidelines, we consider these various methods of assessing autophagy and what information can, or cannot, be obtained from them. Finally, by discussing the merits and limits of particular autophagy assays, we hope to encourage technical innovation in the field.
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| 4. |
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| 5. |
- Andersson, Martin, et al.
(author)
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Jobbskapande och produktivitet i små kontra nya företag : Global Award for Entrepreneurship Research 2020 till John Haltiwanger
- 2021
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In: Ekonomisk Debatt. - : Nationalekonomiska Föreningen. - 0345-2646. ; 7:49, s. 5-15
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Research review (other academic/artistic)abstract
- Denna artikel presenterar 2020 års pristagare av Global Award for Entrepreneurship Research – John Haltiwanger – och de bidrag han har gjort inom entreprenörskapsforskningen. Haltiwanger har bl a bidragit till att förbättra vår förståelse av hur jobb skapas och försvinner, kartlägga vilka faktorer som styr produktivitet samt analysera hur småföretag bidrar till den ekonomiska utvecklingen. Hans forskning har inspirerat såväl policydebatt som nationella statistikmyndigheter världen över.
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| 6. |
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| 7. |
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| 8. |
- Boström, Cecilia, et al.
(author)
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Experimental results of rectification and filtration from an offshore wave energy system
- 2009
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In: Renewable energy. - : Elsevier BV. - 0960-1481 .- 1879-0682. ; 34:5, s. 1381-1387
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Journal article (peer-reviewed)abstract
- The present paper presents results from a wave energy conversion that is based on a direct drive linear generator. The linear generator is placed on the seabed and connected to a buoy via a rope. Thereby, the natural wave motion is transferred to the translator by the buoy motion. When using direct drive generators, voltage and current output will have varying frequency and varying amplitude and the power must be converted before a grid connection. The electrical system is therefore an important part to study in the complete conversion system from wave energy to grid connected power. This paper will bring up the first steps in the conversion: rectification and filtration of the power. Both simulation studies and offshore experiments have been made. The results indicate that this kind of system works in a satisfactory way and a smooth DC power can be achieved with one linear generator.
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| 9. |
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| 10. |
- Coad, Alex, et al.
(author)
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John Haltiwanger : recipient of the 2020 Global Award for Entrepreneurship Research
- 2022
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In: Small Business Economics. - : Springer. - 0921-898X .- 1573-0913. ; 58:1, s. 15-25
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Journal article (pop. science, debate, etc.)abstract
- The 2020 Global Award for Entrepreneurship Research has been awarded to Professor John Haltiwanger. John Haltiwanger has made significant contributions to the field of entrepreneurship by improving our understanding of job creation and destruction, productivity growth, and the role of small- and medium-sized firms (SMEs) in economic development. He has played a major role in the careful development of large, longitudinal firm-level datasets, and introduced a novel and widely adopted measure of firm growth that addresses previous statistical biases. His work has influenced public policy and national statistical offices around the world. Plain English Summary The winner of the 2020 Global Award for Entrepreneurship Research, John Haltiwanger, has pioneered research showing that it is mainly firm age, not size, that matters for job creation. Through analyzing the relationship between employment, growth, and firms, he has advanced our understanding of how the economy works. He has done this by building new datasets and introducing a new measure of firm growth, solving problems encountered with earlier techniques. His work has also broadened the policy debate on entrepreneurship and inspired people all around the world. From a policy perspective, John Haltiwanger has shown that it is difficult to justify targeted industrial and commercial policies, and if job creation is to be supported, politicians need to target young firms rather than small firms. These important findings from John Haltiwanger's pioneering work have been published in world-class leading academic and scientific journals.
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| 11. |
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| 12. |
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| 13. |
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| 14. |
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| 15. |
- Eckbo, B. Espen, et al.
(author)
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Gains to bidder firms revisited : Domestic and Foreign Acquisitions in Canada
- 2000
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In: Journal of Financial and Quantitative Analysis. - : Cambridge University Press (CUP): HSS Journals. - 0022-1090. ; 35:1, s. 1-25
-
Journal article (peer-reviewed)abstract
- We present large-sample evidence on the performance of domestic and U.S.(foreign) bidder firms acquiring Canadian targets. Domestic bidders earn significantly positive average announcement-period abnormal returns, while U.S. bidder returns are indistinguishable from zero. Measures of pre- and post-acquisition abnormal accounting performance are also consistent with a superior domestic bidder performance. Domestic bidder announcement returns are on average greatest for offers involving stock-payment and for the bidders with the smallest equity size relative to the target. Neither direct foreign investment controls, horizontal product-market relationships, nor acquisition propensities explain why domestic bidders outperform their U.S. competitors
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| 16. |
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| 17. |
- Foss, Nicolai J., et al.
(author)
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Saras Sarasvathy : recipient of the 2022 Global Award for Entrepreneurship Research
- 2023
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In: Small Business Economics. - : Springer. - 0921-898X .- 1573-0913. ; 61:1, s. 1-10
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Journal article (peer-reviewed)abstract
- Professor Saras Sarasvathy is the recipient of the 2022 Global Award for Entrepreneurship Research. Her research contributions have fundamentally changed and invigorated the conversation in the domain of entrepreneurship research. Sarasvathy’s work on effectuation emphasizes how entrepreneurs operate based on available resources, think in terms of affordable loss rather than profit maximization, leverage trustworthy partnerships, and treat unforeseen contingencies as opportunities rather than problems. It has led and inspired a new generation of researchers in the quest for a better understanding of how entrepreneurs make their decisions and the unfolding of the entrepreneurial process. © 2023, The Author(s).
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| 18. |
- Foss, Nicolai J., et al.
(author)
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Saras Sarasvathy : recipient of the 2022 Global Award for Entrepreneurship Research
- 2023
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In: Small Business Economics. - : Springer. - 0921-898X .- 1573-0913. ; 61, s. 1-10
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Journal article (pop. science, debate, etc.)abstract
- Professor Saras Sarasvathy is the recipient of the 2022 Global Award for Entrepreneurship Research. Her research contributions have fundamentally changed and invigorated the conversation in the domain of entrepreneurship research. Sarasvathy's work on effectuation emphasizes how entrepreneurs operate based on available resources, think in terms of affordable loss rather than profit maximization, leverage trustworthy partnerships, and treat unforeseen contingencies as opportunities rather than problems. It has led and inspired a new generation of researchers in the quest for a better understanding of how entrepreneurs make their decisions and the unfolding of the entrepreneurial process.
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| 19. |
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| 20. |
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| 21. |
- Henfridsson, Urban, et al.
(author)
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Wave energy potential in the Baltic Sea and the Danish part of the North Sea, with reflections on the Skagerrak
- 2007
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In: Renewable energy. - : Elsevier BV. - 0960-1481 .- 1879-0682. ; 32:12, s. 2069-2084
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Journal article (peer-reviewed)abstract
- Wave power, along with renewable energy-generating sources like tides and streams, is underestimated considering its advantageous physical properties and predictability. This paper examines possible examples of wave power installations in the Baltic Sea and the Danish part of the North Sea. Hindcasting data is used allowing estimations of wave energy generated and results show promising areas in the North Sea, but also several parts of the Baltic Sea are of interest. The study is based upon linear generator technique, placed on the seabed using point-absorbers arranged in arrays of up to several thousand units. The study aims at showing the physical possibilities of wave energy, including economical feasibility and environmental advantages of wave energy even in moderate wave climates. With discussion from two examples in the Baltic Sea, one in the Danish North Sea and a new pilot study site in the Swedish part of Skagerrak, this study show feasible illustrations of wave energy takeouts. Project examples vary in size due to distance to grid, grid voltage, and may thus be economically feasible. Examples also show considerations in societal and nature conservation matters, including aspects such as industrial and military interests, archaeological or marine reserves and local geology. The authors conclude that wave energy electric conversion is an option that needs more attention and which has several advantages compared to conventional renewable sources. Sound engineering, in combination with producer, consumer and broad societal perspective is advised for a sustainable development of wave energy conversion.
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| 22. |
- Henrekson, Magnus, et al.
(author)
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Per Davidsson: 2023 års mottagare av Global Award for Entrepreneurship Research
- 2023
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In: Ekonomisk Debatt. - : Nationalekonomiska Föreningen. - 2002-4231 .- 0345-2646. ; 51:7, s. 18-28
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Journal article (other academic/artistic)abstract
- Professor Per Davidsson är mottagare av 2023 års Global Award for Entrepreneurship Research. Under sin utomordentligt produktiva karriär har han gjort ovärderliga insatser för att bygga upp forskningsområdet entreprenörskap. Hans tidiga studier om entreprenörskap och kultur samt om småföretagens tillväxt spelade en viktig roll för uppkomsten och utvecklingen av entreprenörskap som en vetenskaplig disciplin. Han har också fortlöpande bidragit med mer konceptuella bidrag genom att kritiskt granska utvecklingen av forskningsfältet och genom att skriva grundläggande böcker som har använts flitigt vid högre utbildningsinstitutioner. Genom att undersöka och ifrågasätta traditionella antaganden har han bidragit till att förbättra och förnya området.
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| 23. |
- Krishna, Remya, 1985-
(author)
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Grid Connected Three-Level Converters : Studies for Wave Energy Conversion
- 2014
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Doctoral thesis (other academic/artistic)abstract
- This thesis presents an electrical system analysis of a wave energy converter (WEC) for the objective of grid connection. To transfer the enormous amount of power from waves to the load centers, efficient power electronic systems are essential. This thesis includes the modeling of a buoy–translator dynamics and the modeling of a linear permanent magnet generator along with simulation and experimental validation. Diode bridge rectifiers are considered for rectification to avoid the complex linear generator control at the input side. To reduce the size and the cost of energy storage elements, DC voltage regulation is done using a DC/DC converter.To achieve smooth and high power, many WECs need to be connected to a common DC link. A neutral point clamped inverter is considered for the DC/AC conversion due to its advantages over conventional topologies. Various pulse width modulation schemes are tested for the inverter to choose the optimum PWM method. The harmonics in the inverter output voltage is derived numerically and compared with simulation and experiment to understand the effect of dead-time in the inverter operation.Depending on the load current drawn from the inverter, the voltages in the two input capacitors of a three-level neutral point clamped inverter deviates from equilibrium unless the neutral point is grounded. To avoid this voltage imbalance as well as to regulate the DC link voltage a dual output boost converter with pulse delay control is proposed. The modeling, simulation and experiments show an improvement in the compensation voltage using pulse delay control compared to the previously proposed methods in the literature. The synchronous current control and the grid connection of the three-level converter have been accomplished in the laboratory. Finally, the three-level power converter system has been tested with a linear permanent magnet generator at Lysekil to analyze the controller requirements.
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| 24. |
- Leijon, Mats, et al.
(author)
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An electrical approach to wave energy conversion
- 2006
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In: Renewable energy. - : Elsevier BV. - 0960-1481 .- 1879-0682. ; :31, s. 1309-1319
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Journal article (peer-reviewed)abstract
- Motions in nature, for example ocean waves, can play a significant role in tomorrow's electricity production, but the constructions require adaptations to its media. Engineers planning hydropower plants have always taken natural conditions, such as fall height, speed of flow, and geometry, as basic design parameters and constraints in the design. The present paper describes a novel approach for electric power conversion of the vast ocean wave energy. The suggested linear electric energy converter is adapted to the natural wave motion using straightforward technology. Extensive simulations of the wave energy concept are presented, along with results from the experimental setup of a multisided permanent magnet linear generator. The prototype is designed through systematic electromagnetic field calculations. The experimental results are used for the verification of measurements in the design process of future full-scale direct wave energy converters. The present paper, describes the energy conversion concept from a system perspective, and also discusses the economical and some environmental considerations for the project.
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| 25. |
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| 26. |
- Minniti, Maria, et al.
(author)
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Boyan Jovanovic : recipient of the 2019 Global Award for Entrepreneurship Research
- 2019
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In: Small Business Economics. - : SPRINGER. - 0921-898X .- 1573-0913. ; 53:3, s. 547-553
-
Journal article (peer-reviewed)abstract
- The 2019 Global Award for Entrepreneurship Research has been awarded to Professor Boyan Jovanovic at New York University in the USA. Boyan Jovanovic has developed pioneering research that advances our understanding of the competitive dynamics between incumbent firms and new entrants, entrepreneurial learning and selection processes, and the importance of entrepreneurship for the economy. Key perspectives in his research are that the entrepreneur makes employment choices based on the comparative advantage of his or her skills and that entrepreneurial firms are vehicles of technological change and knowledge diffusion that influence industry dynamics and, in turn, economic growth.
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| 27. |
- Storey, David J., et al.
(author)
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Per Davidsson : recipient of the 2023 Global Award for Entrepreneurship Research
- 2023
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In: Small Business Economics. - : Springer. - 0921-898X .- 1573-0913. ; 61:4, s. 1381-1390
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Journal article (other academic/artistic)abstract
- Professor Per Davidsson is the recipient of the 2023 Global Award for Entrepreneurship Research. Throughout an extraordinarily productive career, he has made invaluable contributions in building the field of entrepreneurship. His early studies on entrepreneurship and culture and his studies on the growth of small businesses played an important role in the emergence and development of entrepreneurship as a scholarly field of research. He has also, continuously, made more conceptual contributions by critically probing the development of the field, and engaged in writing foundational books that have been used extensively in higher education institutes. By probing and challenging traditional assumptions throughout his career, he has contributed to the refinement and renewal of the field.
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| 28. |
- Storey, David J., et al.
(author)
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Per Davidsson : recipient of the 2023 Global Award for Entrepreneurship Research
- 2023
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In: Small Business Economics. - : Springer. - 0921-898X .- 1573-0913. ; 61:4, s. 1381-1390
-
Journal article (pop. science, debate, etc.)abstract
- Professor Per Davidsson is the recipient of the 2023 Global Award for Entrepreneurship Research. Throughout an extraordinarily productive career, he has made invaluable contributions in building the field of entrepreneurship. His early studies on entrepreneurship and culture and his studies on the growth of small businesses played an important role in the emergence and development of entrepreneurship as a scholarly field of research. He has also, continuously, made more conceptual contributions by critically probing the development of the field, and engaged in writing foundational books that have been used extensively in higher education institutes. By probing and challenging traditional assumptions throughout his career, he has contributed to the refinement and renewal of the field.
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| 29. |
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| 30. |
- Thorburn, Karin, et al.
(author)
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Analytical and circuit simulations of linear generators in farm
- 2006
-
In: Transmission and Distribution Conference and Exhibition, 2005/2006 IEEE PES. - 0780391942 ; , s. 495-500
-
Conference paper (peer-reviewed)abstract
- Wave energy is an emerging kind of renewable energy, and several energy conversion methods are available today. One solution is to connect a buoy to a linear generator. Such units are quite small (10-100 kW), and farm solutions are suggested to increase power production. This paper shows the results from small farm simulations where the alternator motion is varied for the generators in the farm
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| 31. |
- Thorburn, Karin
(author)
-
Bankruptcy auctions: costs, debt recovery, and firm survival
- 2000
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In: Journal of Financial Economics. - : Elsevier. - 0304-405X. ; 58:3, s. 337-368
-
Journal article (peer-reviewed)abstract
- This paper provides some first, large-sample evidence on the Swedish auction bankruptcy system. Compared to U.S. Chapter 11 cases, the small-firm bankruptcy auctions examined here are substantially quicker, have lower costs, and avoid deviations from absolute priority. Three-quarters of the firms are auctioned as going concerns, which is similar to Chapter 11 survival rates. Moreover, based on market values, creditors in going-concern auctions recover a similar fraction of face value as creditors of much larger firms in Chapter 11 reorganizations. The evidence presented here suggests that the auction bankruptcy system is a surprisingly efficient restructuring mechanism for small firms.
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| 32. |
- Thorburn, Karin, et al.
(author)
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Case study of upgrading potential for a small hydro power station
- 2005
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In: Renewable energy. - : Elsevier BV. - 0960-1481 .- 1879-0682. ; 30:7, s. 1091-1099
-
Journal article (peer-reviewed)abstract
- Schemes for upgrading hydro power are formed in many parts of the world. Small hydro power (<15 MW) constitutes a fraction of all hydro power, but upgrading can still be worthwhile. In this article, a small generating station in Sweden, with two generators, is simulated with new generators. The voltage is increased by introducing a cable wound stator, thereby the transformers can be excluded, and more efficient generators are introduced with a higher power factor. These improvements lead to an active power increase from 8.9 to 9.4 MW per generator, which means an increased total annual production by 4.2 GW h.
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| 33. |
- Thorburn, Karin
(author)
-
Cash auction bankruptcy and corporate restructuring
- 1998
-
Doctoral thesis (other academic/artistic)abstract
- In Sweden, firms that file for bankruptcy are all auctioned off either piecemeal or as going concerns. Upon filing, managers lose control of the firm. In contrast, in the U.S. managers retain control by selecting to renegotiate the financial claims on the firm under court-supervision (Chapter 11). This thesis addresses the ongoing debate as to whether a Chapter 11-style renegotiation option is valuable to the firm’s securityholders. The optimal bankruptcy system depends on how well the auction system itself functions as well as on the extent to which managers misuse the renegotiation option to their own benefit (the agency problem). While there is substantial evidence on Chapter 11 cases, the thesis provides some first evidence on the workings of a pure auction system using Swedish data. The first essay examines direct costs, creditor recovery rates and auction premiums in Sweden, and compares the results to extant evidence on U.S. Chapter 11 cases. Overall, the results suggest that mandatory auctions provide a relatively cost-efficient bankruptcy procedure, producing recovery rates that are similar to those reported for much larger firms in Chapter 11. Moreover, auction premiums are significant and tend to increase with industry distress, which contradicts arguments that financially distressed firms sell assets below their true value. The second essay provides some first evidence on managerial compensation, turnover and corporate performance following Swedish bankruptcy auctions. The evidence indicates that mandatory auctions act as a substantial managerial disciplinary force: CEOs typically incur significant compensation losses and a majority of CEOs lose their job through the auction. Nevertheless, the operating profitability of the auctioned firms is typically at par with industry norms. Thus, although CEO wealth effects and turnover rates are dramatic, there is little support for the argument that managers in an auction bankruptcy system tend to delay filing at the detriment of the firm's going concern value. Essays three and four take a broader perspective on corporate restructurings. The third essay examines alternative econometric explanations for the lack of stock market gains to bidder firms reported in the literature. The analysis, which uses a large sample of Canadian targets, provides new evidence consistent with the proposition that the measured gains to relatively large, frequent acquirors reflect an attenuation bias produced by event-study econometrics. Moreover, the results suggest that mergers between relatively equal-sized firms, and which have not generated anticipation of future acquisition activity, tend to produce significantly positive bidder gains. This supports the use of mergers also as an alternative to bankruptcy.
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| 34. |
- Thorburn, Karin, 1976-
(author)
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Electric Energy Conversion Systems : Wave Energy and Hydropower
- 2006
-
Doctoral thesis (other academic/artistic)abstract
- Electric energy conversion is an important issue in today's society as our daily lives largely depend on the supplies of energy. Two energy sources are studied for conversion in the present thesis, ocean waves and hydropower. The work focuses on the generator and the transmission of its output to the electric grid.Different approaches have been used, over the years, to convert the energy in ocean waves, and the method presently used is based on a point absorber (buoy) directly coupled to a linear generator on the seabed. A varying alternating voltage is induced with such configuration, where both the amplitude and the frequency changes continuously. The target is to connect several units in a farm, and thereby decrease the fluctuations in power production. This is shown to be possible to accomplish with a rectifier connected to each generator. Transmission systems can be designed with converters and transformers to connect the farm to the electric grid onshore. Several aspects of the concept are considered as well as interconnection issues. Analytical calculations verified by finite element simulations and measured data are used to model the behaviour of a linear generator. A series expanded expression for the ideal no-load flux and EMF (electromotive force) is derived, which can be developed into an analytical transmission design tool.Hydropower has been used for more than a century. Today many of the stations from the mid 1900's are up for refurbishment. Studies with finite element calculations show that a higher electric efficiency can be obtained with a high voltage cable wound generator.
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| 35. |
- Thorburn, Karin, et al.
(author)
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Farm size comparison with analytical model of linear generator wave energy converters
- 2007
-
In: Ocean Engineering. - : Elsevier BV. - 0029-8018 .- 1873-5258. ; 34:5-6, s. 908-916
-
Journal article (peer-reviewed)abstract
- Ocean wave energy is an emerging kind of renewable energy, and several energy conversion methods are available today. One solution is to connect a buoy to a linear generator. Such units are quite small (10–100 kW), and farm solutions are suggested to increase power production. This paper shows the results from small farm simulations where the translator motion is varied for the generators in the farm. Simulations with five and 10 units show that power fluctuations decrease with an increasing number of generators.
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| 36. |
- Thorburn, Karin
(author)
-
Företag i finansiell kris och konkurs
- 1998
-
In: Från optionsprissättning till konkurslagstiftning. - Stockholm : Ekonomiska forskningsinstitutet vid Handelshögsk. EFI. - 917258453X ; , s. 15-30
-
Book chapter (other academic/artistic)abstract
- This paper provides a survey of much of the academic literature on the resolution of financial distress. Firms tend to resolve their financial difficulties through one or more of the following mechanisms: (1) asset sales, (2) equity issues, (3) merger with a healthy firm, (4) voluntary reorganization of the financial claims, and (5) formal bankruptcy. While most financially distressed firms sell assets, equity holders are typically unwilling to provide new equity capital. Private debt restructurings appear to be faster and less costly for the firm compared to a formal bankruptcy proceeding. Out-of-court restructurings occasionally. fail, however, reflecting fre-rider problems, information asymmetries or conflicts of interest between the firm's claimants. Moreover, firms frequently lower their bankruptcy costs by filing pre-negotiated "prepackaged" bankruptcy petitions.
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| 37. |
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| 38. |
- Thorburn, Karin
(author)
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Managerial compensation and corporate performance following cash auction bankruptcy
- 1998
-
Other publication (other academic/artistic)abstract
- This paper provides large-sample evidence on CEO compensation changes, turnover and corporate performance following cash auction bankruptcy in Sweden. Mandatory bankruptcy auctions appear to impose substantial costs on top level managers: the median loss of CEO compensation is 40% over the two years following auction bankruptcy filing and the CEO turnover rate during bankruptcy is 64%. While CEO personal wealth effects and turnover are dramatic, the operating profitability of the auctioned firms is, however, typically at par with industry norms. Thus, there is no support in this paper for the hypothesis that managers in a cash auction bankruptcy system tend to file "too late". In comparison, extant evidence on the U.S. bankruptcy code (in particular Hotchkiss (1995)), which permits managers to maintain control of the firm during Chapter 11 reorganization proceedings, indicates much lower CEO turnover rate (33%) and poorer operating performance by bankrupt firms relative to their industry competitors.
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| 39. |
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| 40. |
- Thorburn, Karin, et al.
(author)
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Time stepping finite element analysis of variable speed synchronous generator with rectifier
- 2006
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In: Applied Energy. - : Elsevier BV. - 0306-2619 .- 1872-9118. ; 83:4, s. 371-386
-
Journal article (peer-reviewed)abstract
- Several applications for renewable energy conversion make use of variable speed generators. A conversion from variable frequency to grid frequency is therefore essential. One part of the converter is a rectifier. A rectifier model is presented, which is integrated in a time stepping finite element simulation environment where the generator and circuit equations are solved simultaneously. The model handles bidirectional alternator speeds as the application is a linear generator for ocean wave energy conversion. The rectifier model is extended with a load model, consisting of R, L and E, and simulations show what impact the rectifier has on the generator’s behaviour.
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| 41. |
- Thorburn, Karin, et al.
(author)
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Wave energy transmission system concepts for linear generator arrays
- 2004
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In: Ocean Engineering. - : Elsevier BV. - 0029-8018 .- 1873-5258. ; 31:11-12, s. 1339-1349
-
Journal article (peer-reviewed)abstract
- Wave energy is a renewable source, which has so far not been exploited widely. Many of the various schemes in the past consist of large mechanical structures, often located near the sea surface. This article presents a range of systems with point absorbers on the surface and linear generators placed on the seabed, converting the wave motion into electrical power. Electrical power components are combined in different ways to obtain solutions suitable for various conditions. Different topologies for the electrical system transmitting power to the grid are discussed. Qualitative case studies are used to exemplify system options and connection schemes.
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