# Mats Leijon

Professor i elektricitetslära vid Institutionen för elektroteknik; Elektricitetslära

- Telefon:
- 018-471 58 08
- Mobiltelefon:
- 070-425 09 23
- E-post:
- mats.leijon@angstrom.uu.se
- Besöksadress:
- Ångströmlaboratoriet, Lägerhyddsvägen 1

752 37 Uppsala - Postadress:
- Box 65

751 03 UPPSALA

Ladda ned kontaktuppgifter för Mats Leijon vid Institutionen för elektroteknik; Elektricitetslära

- Akademiska meriter:
- TeknDr

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## Kort presentation

Professor vid Uppsala Universitet

## Publikationer

### Urval av publikationer

- Offshore deployments of wave energy converters by Uppsala University, Sweden (2019)
- Offshore Deployments of Wave Energy Converters by Seabased Industry AB (2017)
- Numerical modelling of a point-absorbing wave energy converter in irregular and extreme waves (2017)
- Electrical Approach to Output Power Optimization for a Point Absorbing Wave Energy Converter with a Direct Drive Linear Generator Power Take Off (2017)
- Cross-Regulation Assessment of DIDO Buck-Boost Converter for Renewable Energy Application (2017)
- Buoy geometry and its inﬂuence on survivability for apoint absorbing wave energy converter (2017)
- Power And Energy Needed For Starting A Vertical Axis Marine Current Turbine (2017)
- Partial Stator Overlap in a Linear Generator for Wave Power (2017)
- Experimental study of generator damping at partial stator overlap in a linear generator for wave power (2017)
- Automated Cable Preparation for Robotized Stator Cable Winding (2017)
- Automated Mounting of Pole-Shoe Wedges in Linear Wave Power Generators-Using Industrial Robotics and Proximity Sensors (2017)
- Linear Generator with Different Types of Ferrite Permanent Magnets for Wave Energy Conversion (2017)
- Survivability of a Point Absorbing Wave Energy Converter Impacted by Tsunami Waves (2017)
- Calculating Buoy Response for a Wave Energy Converter - a Comparsion Between Two Computational Methods and Experimental Results (2017)
- Experimental Verification of a Back-to-Back 2L-3L Grid Connection System for a Marine Current Energy Converter (2016)
- Thermal Rating of a Submerged Substation for Wave Power (2016)
- A Methodology of Modelling a Wave Power System via an Equivalent RLC Circuit (2016)
- Study of the operation characteristics of a point absorbing direct driven permanent magnet linear generator deployed in the Baltic Sea (2016)
- Bivariate joint distribution modeling of wave climate data using a copula method (2016)
- Statistical Analysis of Wave Climate Data Using Mixed Distributions and Extreme Wave Prediction (2016)
- Experimental demonstration of performance of a vertical axis marine current turbine in a river (2016)
- One-Dimensional Modelling of Marine Current Turbine Runaway Behaviour (2016)
- Three-Dimensional Oscillation Dynamics of the In Situ Piston Rod Transmission Between Buoy Line and the Double Hinge-Connected Translator in an Offshore Linear Wave Energy Converter (2016)
- Offshore Measurement System for WavePower (2016)
- Line Force and Damping at Full and Partial Stator Overlap in a Linear Generator for Wave Power (2016)
- Performance of arrays of direct-driven wave energy converters under optimal power take-off damping (2016)
- Coordinated Control of Wave Energy Converters Subject to Motion Constraints (2016)
- A Back-to-Back 2L-3L Grid Integration of a Marine Current Energy Converter (2015)
- Offshore Deployment of Marine Substation in the Lysekil Research Site (2015)
- Contour-Based Dead-Time Harmonic Analysis in a Three-Level Neutral-Point-Clamped Inverter (2015)
- Electrical damping of linear generators for wave energy converters (2015)
- Development of Power Electronics Based Test Platform for Characterization and Testing of Magnetocaloric Materials (2015)
- DC-Link Stress Analysis for the Grid Connection of Point Absorber Type Wave Energy Converters (2015)
- Properties of the Energy Transport for Plane-Parallel Polychromatic Surface Gravity Waves in Waters of Arbitrary Depth (2015)
- Experimental Results of a DC Bus Voltage Level Control for a Load-Controlled Marine Current Energy Converter (2015)
- On the Stator Slot Geometry of a Cable Wound Generator for Hydrokinetic Energy Conversion (2015)
- Wave loads on a point-absorbing wave energy device in extreme waves (2015)
- Wave loads on a point-absorbing wave energy device in extreme waves (2015)
- Modelling a point absorbing wave energy converter by the equivalent electric circuit theory (2015)
- Pulse delay Control for Capacitor VoltageBalancing in a Three Level Boost Neutral PointClamped Inverter (2015)
- Experimental results on power absorption from a wave energy converter at the Lysekil wave energy research site (2015)
- Optimization of the Power Absorption for a Linear Generator Wave Energy Converter (2015)
- Parametric Study of the Power Absorption for a Linear Generator Wave Energy Converter (2015)
- Study of the foundation design for a linear generator wave energy converter using stochastic methods (2015)
- Comparison of Output Current Ripple in Single and Dual Three-Phase Inverters for Electric Vehicle Motor Drives (2015)
- Studying the Wake of a Marine Current Turbine Using an Acoustic Doppler Current Profiler (2015)
- CFD Analysis on the Effect of the Tidal Gratingin Opposite Directions (2015)
- Wave Energy Research at Uppsala University and The Lysekil Research Site, Sweden (2015)
- Measurement System for Evaluating Wanted and Unwanted Forces on a Point Absorbing Wave Energy Converter during Offshore Operation (2015)
- Evaluation of Damping Strategies for Maximum Power Extraction from a Wave Energy Converter with a Linear Generator (2014)
- Measurements of tidal current velocities in the Folda fjord, Norway, with the use of a vessel mounted ADCP (2014)
- Offshore Deployment of Point Absorbing Wave Energy Converters with a Direct Driven Linear Generator Power Take-Off at the Lysekil Test Site (2014)
- Risk based estimation of failure in a steel wire used for the wave energy converter connection line (2014)
- Performance enhancement of a vertical axis cross-flow hydro-kinetic energy converter (2014)
- Inverter topology with integrated on-load tap change for grid-connection of renewable electric energy sources (2014)
- Evaluating Constant DC-Link Operation of Wave Energy Converter (2014)
- Control of offshore marine substation for grid-connection of a wave power farm (2014)
- Lower order grid current harmonics for a voltage-source inverter connected to a distorted grid (2014)
- Fast solid-state tap-change using two current-controlled voltage-source inverters (2014)
- Discontinuous conduction mode of a three-level boost DC-DC converter and its merits and limits for voltage cross regulation applications (2014)
- Measurements of Extreme Forces on a Wave Energy Converter of Point Absorber Type and Estimation of Added Mass of Cylindrical Buoy (2014)
- Analytical and numerical approaches to optimizing fluid-structure interactions in wave energy parks (2014)
- Methods of reducing power fluctuations in wave energy parks (2014)
- Force in the connection line for a wave energy converter (2014)
- Review on electrical control strategies for wave energy converting systems (2014)
- Preparing the Uppsala University wave energy converter generator for large-scale production (2014)
- A cable feeder tool for robotized cable winding (2014)
- Robotized stacking of the Uppsala University wave energy converter generator stator (2014)
- Robotized Surface Mounting of Permanent Magnets (2014)
- Synchronous Current Compensator for a Self Balanced Three-Level Neutral Point Clamped Inverter (2014)
- Detailed Study of Closed Stator Slots for a Direct-Driven Synchronous Permanent Magnet Linear Wave Energy Converter (2014)
- Measurement System For Wave Energy Converter - Design And Implementation (2014)
- Current Ripple Evaluation in Dual Three-Phase Inverters for Open-End Winding EV Drives (2014)
- Analysis of Three-level Buck-Boost Converter Operation for Improved Renewable Energy Conversion and Smart Grid Integration (2014)
- Peak Force Measurements on a Cylindrical Buoy with Limited Elastic Mooring (2014)
- Linear Generator Connected to a Resonance-Rectifier Circuit (2013)
- Tidal effect compensation system for point absorbing wave energy converters (2013)
- Axial Force Damper in a Linear Wave Energy Converter (2013)
- Ideal Analytical Expression of the Magnetic Circuit in a Permanent Magnet Linear Machine (2013)
- Experimental Verifications of Offshore Marine Substation for Grid-Connection of Wave Energy Farm (2013)
- Transformer Magnetization Losses Using a Nonfiltered Voltage-Source Inverter (2013)
- Transformer Magnetizing Inrush Currents Using a Directly Coupled Voltage-Source Inverter (2013)
- Marine substation design for grid-connection of a research wave power plant on the Swedish West coast (2013)
- Measurement system design and implementation for grid-connected marine substation (2013)
- FPGA Control Implementation of a Grid-Connected Current-Controlled Voltage-Source Inverter (2013)
- Grid Connection of Wave Power Farm Using an N-Level Cascaded H-Bridge Multilevel Inverter (2013)
- Performance of large arrays of point absorbing direct-driven wave energy converters (2013)
- Efficiency of a Directly Driven Generator for Hydrokinetic Energy Conversion (2013)
- Hydroacoustic measurements of the radiated noise from Wave Energy Converters in the Lysekil project and project WESA (2013)
- Characteristics of the Operational Noise from Full Scale Wave Energy Converters in the Lysekil Project (2013)
- Status Update of the Wave Energy Research at Uppsala University (2013)
- Utilizing cable winding and industrial robots to facilitate the manufacturing of electric machines (2013)
- Six-Degrees-of-Freedom (6-DOF) Work Object Positional Calibration Using a Robot-Held Proximity Sensor (2013)
- Analysis of linear wave power generator model with real sea experimental results (2013)
- Optimal Constant DC Link Voltage Operation of aWave Energy Converter (2013)
- On the velocity distribution for hydro-kinetic energy conversion from tidal currents and rivers (2013)
- Evaluation of a model for predicting the tidal velocity in fjord entrances (2013)
- On a Two Pole Motor for Electric Propulsion System (2013)
- The Söderfors Project (2013)
- Time Series-, Time-Frequency- and Spectral Analyses of Sensor Measurements in an Offshore Wave Energy Converter Based on Linear Generator Technology (2013)
- Control and Implementation of Three Level BoostConverter for Load Voltage Regulation (2013)
- Implementation of Control System for Hydrokinetic Energy Converter (2013)
- Temperature Study in a Marine Substation for Wave Power (2012)
- Electric resonance-rectifier circuit for renewable energy conversion (2012)
- Temperature measurements in a linear generator and marine substation for wave power (2012)
- Wireless System for Tidal Effect Compensation in the Lysekil Research Site (2012)
- Electrical Motor Drivelines in Commercial All Electric Vehicles (2012)
- Experimental results from a linear wave power generator connected to a resonance circuit (2012)
- Total instantaneous energy transport in polychromatic fluid gravity waves at finite depth (2012)
- Electromagnetic, Mechanical and Manufacturing Properties for Cable Wound Direct-Drive PM Linear Generators for Offshore Environments (2012)
- Experimental results from the operation of aggregated wave energy converters (2012)
- Azimuth-inclination angles and snatch load on a tight mooring system (2012)
- Estimation of Stress in the Inner Framework Structure of a Single Heaving Buoy Wave Energy Converter (2012)
- Simulation of Hydrodynamical Forces on a Buoy - a Comparison Between Two Computational Approaches (2012)
- A Set-Up of 7 Laser Triangulation Sensors and a Draw-Wire Sensor for Measuring Relative Displacement of a Piston Rod Mechanical Lead-Through Transmission in an Offshore Wave Energy Converter on the Ocean Floor (2012)
- A Permanent Magnet Generator for Energy Conversion from Marine Currents (2012)
- Operation analysis of a wave energy converter under different load conditions (2011)
- Prediction of the Inductance in a Synchronous Linear Permanent Magnet Generator (2011)
- A resonant Two Body System for a point absorbing Wave Energy Converter with direct-driven linear generator (2011)
- A 225 kW Direct Driven PM Generator Adapted to a Vertical Axis Wind Turbine (2011)
- Gerador de ímãs permanentes de acionamento direto para turbina de eixo vertical (2011)
- Power coefficient measurement on a 12 kW straight bladed vertical axis wind turbine (2011)
- In-stream energy converters in a river (2011)
- Renewable energies (2011)
- A resonance circuit for electrical conversion systems (2011)
- Lysekil Research Site, Sweden (2011)
- Optimization of the Dimensions of a Gravity-based Wave Energy Converter Foundation Based on Heave and Surge Forces (2011)
- Optimization of the Dimensions of a Gravity-based Wave Energy Converter Foundation Based on Heave and Surge Forces (2011)
- Offshore wave power measurements (2011)
- Dynamic stability of an electricity generation system based on renewable energy (2011)
- Sensors and Measurements Inside the Second and Third Wave Energy Converter at the Lysekil Research Site. (2011)
- Wave Buoy and Translator Motions - On-Site Measurements and Simulations (2011)
- Ocean wave energy absorption in response to wave period and amplitude (2011)
- The Söderfors Project (2011)
- Experimental Results From an Offshore Wave Energy Converter (2010)
- Temperature measurements in a linear generator and marine substation for wave power (2010)
- Fast aeroelastic model for straight bladed vertical axis wind and hydro turbines (2010)
- A Multi-Body Vortex Method Applied to Vertical Axis Wind Turbines (2010)
- A 225 kW direct driven PM generator for a vertical axis wind turbine (2010)
- Description of a torus shaped buoy for wave energy point absorber (2010)
- Depth variation of energy transport in fluid gravity waves (2010)
- Space vector modulation method to balance the neutral point voltage for a three-level inverter (2010)
- Predictive current controller for a grid connected three level inverter with reactive power control (2010)
- Direct Predictive Current Control of GridConnected Neutral Point Clamped Inverterfor Wave Power Extraction (2010)
- Direct Predictive Current Control of Grid Connected Neutral Point Clamped Inverter for Wave Power Extraction (2010)
- Predictive current controller for a grid connected three level inverter with reactive power control (2010)
- Special Issue - selected, expanded papers from EWTEC 2009 (2010)
- Editorial (2010)
- On the physics of power, energy and economics of renewable electric energy sources - Part I (2010)
- Wave Power Absorption as a Function of Water Level and Wave Height (2010)
- Coatings for Renewable Energy (2009)
- Experimental results of rectification and filtration from an offshore wave energy system (2009)
- Design proposal of electrical system for linear generator wave power plants (2009)
- Study of aWave Energy Converter Connected to a Nonlinear Load (2009)
- Wave energy converter with enhanced amplitude response at frequencies coinciding with Swedish west coast sea states by use of a supplementary submerged body (2009)
- FEM simulations and experiments of different loading conditions for a 12 kW direct driven PM synchronous generator for wind power (2009)
- Influence of a Varying Vertical Velocity Profile on Turbine Efficiency for a Vertical Axis Marine Current Turbine, (2009)
- A parameter study of the influence of struts on the performance of a vertical-axis marine current turbine. (2009)
- A review of the tidal current energy resource in Norway (2009)
- Design of an experimental setup for hydro-kinetic energy conversion (2009)
- Transport of energy in polychromatic fluid gravity waves (2009)
- Numerical modeling of a river site for in-stream energy converters (2009)
- A wave power unit (2009)
- Catch the wave to electricity (2009)
- High-voltage pulsed-power cable generator (2009)
- A Design Study of Marine Current Turbine-Generator Combinations (2009)
- Laboratory experimental verification of a marine substation (2009)
- Determining the service life of a steel wire under a working load in the Wave Energy Converter (WEC) (2009)
- Description of the control and measurement system used in the Low Voltage Marine Substation at the Lysekil research site (2009)
- Tracking a Wave Power Buoy Using a Network Camera (2009)
- Wave Climate off the Swedish West Coast (2009)
- Matching a permanent magnet synchronous generator to a fixed pitch vertical axis turbine for marine current energy conversion (2009)
- Poynting theorem applied to cable wound generators (2008)
- Experimental results from an offshore wave energy converter (2008)
- Conformal mapping and efficient boundary element method without, boundary elements for fast vortex particle simulations (2008)
- Evaluation of different turbine concepts for wind power (2008)
- Simulations and experiments on a 12 kW direct driven PM synchronous generator for wind power (2008)
- Wave Energy from the North Sea (2008)
- On the Physics and Economics of Renewable Electric Energy Sources -- part I utilization (2008)
- A wave power unit, a buoy, use of a wave power unit and a method for producing electric energy (2008)
- On the Physics and Economics of Renewable Electric Energy Sources -- part II engineering (2008)
- Influence of Generator Damping on Peak Power and Variance of Power for a Direct Drive Wave Energy Converter (2008)
- A low-speed generator for energy conversion from marine currents – experimental validation of simulations (2008)
- A low-speed generator for energy conversion from marine currents (2008)
- The Lysekil Wave Power Project: Status Update (2008)
- Flywheel energy and power storage systems (2007)
- Flux Distribution in Linear Permanent-Magnet Synchronous Machines Including Longitudinal End Effects (2007)
- Offshore experiments on a direct-driven Wave Energy Converter (2007)
- Wave power absorption (2007)
- Wave energy potential in the Baltic Sea and the Danish part of the North Sea, with reflections on the Skagerrak (2007)
- Coupled FEM and lumped circuit model of the electromagnetic response of coaxially insulated windings in two slot cores (2007)
- Rotor Dynamic Analysis of an Eccentric Hydropower Generator With Damper Winding for Reactive Load (2007)
- Direct electric energy conversion system for energy conversion from marine currents (2007)
- Direct electric energy conversion system for energy conversion from marine currents (2007)
- Inductive high voltage pulse generator based on resonance system (2007)
- 45 GW pulsed-power generator (2007)
- Poynting Vector Analysis of Synchronous Generators Using Field Simulations (2007)
- Influence on the stability of generator rotors due to radial and tangential magnetic pull force (2007)
- A direct drive generator for marine current energy conversion - first experimental results (2007)
- Development of synchronous generators for Swedish hydropower (2007)
- Saturation Effects on Unbalanced Magnetic Pull in a Hydroelectric Generator With an Eccentric Rotor (2007)
- Investigating the overload capacity of a direct-driven synchronous permanent magnet wind turbine generator designed using high-voltage cable technology (2007)
- Influence of Generator Damping on Peak Power and Variance of Power for a Direct Drive Wave Energy Coverter (2007)
- A direct drive generator for marine current energy conversion - first experimental results (2007)
- Farm size comparison with analytical model of linear generator wave energy converters (2007)
- Measuring air gap width of permanent magnet linear generators using search coil sensor (2007)
- Experimental results from sea trials of an offshore wave energy system (2007)
- Experimental setup (2007)
- Wave energy resources in sheltered sea areas (2006)
- Study of a Longitudinal Flux Permanent Magnet Linear Generator for Wave Energy Converters (2006)
- Theory and Experiment on an Elastically Moored Cylindrical Buoy (2006)
- High Voltage Generators; Ideas behind them and Operation Data (2006)
- An electrical approach to wave energy conversion (2006)
- An inductive 700 MW high voltage pulse generator (2006)
- Electromagnetic forces in the air gap of a permanent magnet linear generator at no-load (2006)
- Electromagnetic forces in the air gap of a permanent magnet linear generator at no load (2006)
- Relation between generator geometry and resistance in armature winding (2006)
- Design of a 12kW vertical axis wind turbine equipped with a direct driven PM synchronous generator (2006)
- Design of a 12kW vertical axis wind turbine equipped with a direct driven PM synchronous generator (2006)
- Time stepping finite element analysis of variable speed synchronous generator with rectifier (2006)
- Analytical and circuit simulations of linear generators in farm (2006)
- Generators and electrical systems for direct drive energy conversion (2006)
- Detailed Study of the Magnetic Circuit in a Longitudinal Flux Permanent-Magnet Synchronous Linear Generator (2005)
- A direct drive wave energy converter (2005)
- Hydrodynamic modelling of a direct drive wave energy converter (2005)
- Experiments at Islandsberg on the west coast of Sweden in preparation of the construction of a pilot wave power plant (2005)
- Simulation of Wave-Energy Converter With Octagonal Linear Generator (2005)
- Simulated generator for wave energy extraction in deep water (2005)
- Assembly comprising a Water Turbine and a Generator, the Rotor of which is Direct-Connected to each one of the Blades the Turbine (2005)
- Multiphysics Simulation of Wave Energy to Electric Energy Conversion by Permanent Magnet Linear Generator (2005)
- Transient response of transformer with XLPE insulation cable winding design (2005)
- Transfer of transient surge voltage through XLPE cable winding transformer (Dryformer) circuits (2005)
- Concept of a Direct Drive Permanent Magnetized Generator for Experimental Verification of Marine Current Power Conversion (2005)
- Permanent magnetized generator for marine current power conversion (2005)
- The Marine Current Power Project at the Swedish Centre for Renewable Electric Energy Conversion (2005)
- Full-Scale Testing of PM Linear Generator for Point Absorber WEC (2005)
- Case study of upgrading potential for a small hydro power station (2005)
- A time-dependent potential flow theory for the aerodynamics of vertical axis wind turbines (2005)
- Conversion of wave energy to electricity (2004)
- Rotor configuration impact on generator ventilation needs (2004)
- Rotating and Linear Syncronous Generators for Renewable Electric Energy Conversion (2004)
- Upgrading Generators with new Tools and High Voltage Technology (2004)
- Simulated Response of a Linear Generator Wave Energy Converter (2004)
- Dynamics of a Linear Generator for Wave Energy Conversion (2004)
- Closure on A wide-band lumped circuit model of eddy current losses in a coil with a coaxial insulation system and a stranded conductor (2004)
- A Wideband Lumped Circuit Model of the Terminal and Internal Electromagnetic Response of Rotating Machine Windings with a Coaxial Insulation System (2004)
- Simulation of cogging in a 100kW permanent magnet octagonal linear generator for ocean wave conversion (2004)
- Simulation of a 100 kW permanent magnet octagonal linear generator for ocean wave energy conversion and utilization (2004)
- Advances in Online Monitoring and Localization of Partial Discharges in Large Rotating Machines (2004)
- Converting kinetic energy in small watercourses using direct drive generators (2004)
- Design of a very low speed PM generator for the patented KOBOLD tidal current turbine (2004)
- Wave energy transmission system concepts for linear generator arrays (2004)
- Permanent magnet fixation concepts for linear generator (2003)
- Simulation of Direct Drive Generators Designed for Underwater Vertical Axis Turbines (2003)
- Rotor Concept Comparison for Underwater Power Generation (2002)
- Theory and Simulations of an End Stop Solution in a Linear Wave Power Generator
- Power Production by Linear Wave Energy Converters of Point Absorber Type with Vertical Cylindrical Buoys during Various Sea States
- Toroidal Buoy for Point Absorver WEC with Focus on Added Mass and Overloads

### Senaste publikationer

- Simplified Current-Equivalent Circuit Models of Synchronous Reluctance Machines and Salient Pole Synchronous Machines Considering the Reluctance Torque (2024)
- Stereoscopic Camera-Sensor Model for the Development of Highly Automated Driving Functions within a Virtual Test Environment (2023)
- Development of a Lidar Model for the Analysis of Borderline Cases Including Vehicle Dynamics in a Virtual City Environment in Real Time (2023)
- The force density in electrical machines modeled as tension and pressure gradients of magnetic field lines (2023)
- Review of Hysteresis Models for Magnetic Materials (2023)

### Alla publikationer

#### Artiklar

- Simplified Current-Equivalent Circuit Models of Synchronous Reluctance Machines and Salient Pole Synchronous Machines Considering the Reluctance Torque (2024)
- Stereoscopic Camera-Sensor Model for the Development of Highly Automated Driving Functions within a Virtual Test Environment (2023)
- Development of a Lidar Model for the Analysis of Borderline Cases Including Vehicle Dynamics in a Virtual City Environment in Real Time (2023)
- The force density in electrical machines modeled as tension and pressure gradients of magnetic field lines (2023)
- Review of Hysteresis Models for Magnetic Materials (2023)
- Review of Play and Preisach models for hysteresis in magnetic materials (2023)
- Methodical Approach to Integrate Human Movement Diversity in Real-Time into a Virtual Test Field for Highly Automated Vehicle Systems (2022)
- Power flow in the air gap of linear electrical machines by utilization of the Poynting vector (2022)
- Power flow in the air gap of linear electrical machines by utilization of the Poynting vector (2022)
- Overview of Hybrid Excitation in Electrical Machines (2022)
- Comparison of Poynting's vector and the power flow used in electrical engineering (2022)
- A Review of Permanent Magnet Models Used for Designing Electrical Machines (2022)
- Methodical Approach to the Development of a Radar Sensor Model for the Detection of Urban Traffic Participants Using a Virtual Reality Engine (2021)
- Experimental Evaluation of a Rare Earth-Free Permanent Magnet Generator (2021)
- Imperfections in the air gap and the permanent magnets of linear synchronous permanent magnet generators for wave power (2021)
- Model – Based Approach to investigate the Influences of different Load States to the Vehicle Dynamics of Light Electric Vehicles (2021)
- Grid Impact and Power quality Assessment in wave Energy Parks (2021)
- End Effects and Geometric Compensation in Linear Permanent Magnet Synchronous Generators with Different Topologies (2021)
- Longitudinal End Effects in a Linear Wave Power Generator (2020)
- An Overview of MnAl Permanent Magnets with a Study on Their Potential in Electrical Machines (2020)
- Freshwater and Lithium from Desalination Powered by Marine Energy Sources (2020)
- Variable renewable energy sources for powering reverse osmosis desalination, with a case study of wave powered desalination for Kilifi, Kenya (2020)
- Method for optimizing the magnetic circuit of a linear generator using FEM simulations (2020)
- Offshore deployments of wave energy converters by Uppsala University, Sweden (2019)
- Portable Data Acquisition System for Offshore Applications (2019)
- Virtual Synchronous Generator Based Current Synchronous Detection Scheme for a Virtual Inertia Emulation in SmartGrids (2019)
- Grid Integration and a Power Quality Assessment of a Wave Energy Park (2019)
- Full-Scale Measurement of Reaction Force Caused by Level Ice Interaction on a Buoy Connected to a Wave Energy Converter (2019)
- Robotized stator cable winding (2018)
- An updated cable feeder tool design for robotized stator cable winding (2018)
- Study of an Altered Magnetic Circuit of a Permanent Magnet Linear Generator for Wave Power (2018)
- Energy management for a grid-connected wave energy park through a hybrid energy storage system (2018)
- Statistical analysis of power output from a single heaving buoy WEC for different sea states (2018)
- Offshore Deployments of Wave Energy Converters by Seabased Industry AB (2017)
- Numerical modelling of a point-absorbing wave energy converter in irregular and extreme waves (2017)
- Cross-Regulation Assessment of DIDO Buck-Boost Converter for Renewable Energy Application (2017)
- Partial Stator Overlap in a Linear Generator for Wave Power (2017)
- Automated Cable Preparation for Robotized Stator Cable Winding (2017)
- Automated Mounting of Pole-Shoe Wedges in Linear Wave Power Generators-Using Industrial Robotics and Proximity Sensors (2017)
- Calculating Buoy Response for a Wave Energy Converter - a Comparsion Between Two Computational Methods and Experimental Results (2017)
- Thermal Rating of a Submerged Substation for Wave Power (2016)
- A Methodology of Modelling a Wave Power System via an Equivalent RLC Circuit (2016)
- Study of the operation characteristics of a point absorbing direct driven permanent magnet linear generator deployed in the Baltic Sea (2016)
- Bivariate joint distribution modeling of wave climate data using a copula method (2016)
- Statistical Analysis of Wave Climate Data Using Mixed Distributions and Extreme Wave Prediction (2016)
- Experimental demonstration of performance of a vertical axis marine current turbine in a river (2016)
- One-Dimensional Modelling of Marine Current Turbine Runaway Behaviour (2016)
- Three-Dimensional Oscillation Dynamics of the In Situ Piston Rod Transmission Between Buoy Line and the Double Hinge-Connected Translator in an Offshore Linear Wave Energy Converter (2016)
- Offshore Measurement System for WavePower (2016)
- Line Force and Damping at Full and Partial Stator Overlap in a Linear Generator for Wave Power (2016)
- Performance of arrays of direct-driven wave energy converters under optimal power take-off damping (2016)
- Coordinated Control of Wave Energy Converters Subject to Motion Constraints (2016)
- A Back-to-Back 2L-3L Grid Integration of a Marine Current Energy Converter (2015)
- Contour-Based Dead-Time Harmonic Analysis in a Three-Level Neutral-Point-Clamped Inverter (2015)
- Electrical damping of linear generators for wave energy converters (2015)
- Development of Power Electronics Based Test Platform for Characterization and Testing of Magnetocaloric Materials (2015)
- Properties of the Energy Transport for Plane-Parallel Polychromatic Surface Gravity Waves in Waters of Arbitrary Depth (2015)
- Experimental Results of a DC Bus Voltage Level Control for a Load-Controlled Marine Current Energy Converter (2015)
- On the Stator Slot Geometry of a Cable Wound Generator for Hydrokinetic Energy Conversion (2015)
- Wave loads on a point-absorbing wave energy device in extreme waves (2015)
- Modelling a point absorbing wave energy converter by the equivalent electric circuit theory (2015)
- Pulse delay Control for Capacitor VoltageBalancing in a Three Level Boost Neutral PointClamped Inverter (2015)
- Experimental results on power absorption from a wave energy converter at the Lysekil wave energy research site (2015)
- Parametric Study of the Power Absorption for a Linear Generator Wave Energy Converter (2015)
- Study of the foundation design for a linear generator wave energy converter using stochastic methods (2015)
- Comparison of Output Current Ripple in Single and Dual Three-Phase Inverters for Electric Vehicle Motor Drives (2015)
- A Complete Design of a Rare Earth Metal-Free Permanent Magnet Generator (2014)
- Evaluating Constant DC-Link Operation of Wave Energy Converter (2014)
- Control of offshore marine substation for grid-connection of a wave power farm (2014)
- Lower order grid current harmonics for a voltage-source inverter connected to a distorted grid (2014)
- Fast solid-state tap-change using two current-controlled voltage-source inverters (2014)
- Methods of reducing power fluctuations in wave energy parks (2014)
- Review on electrical control strategies for wave energy converting systems (2014)
- A cable feeder tool for robotized cable winding (2014)
- Robotized Surface Mounting of Permanent Magnets (2014)
- Synchronous Current Compensator for a Self Balanced Three-Level Neutral Point Clamped Inverter (2014)
- Detailed Study of Closed Stator Slots for a Direct-Driven Synchronous Permanent Magnet Linear Wave Energy Converter (2014)
- Peak Force Measurements on a Cylindrical Buoy with Limited Elastic Mooring (2014)
- Linear Generator Connected to a Resonance-Rectifier Circuit (2013)
- Tidal effect compensation system for point absorbing wave energy converters (2013)
- Axial Force Damper in a Linear Wave Energy Converter (2013)
- Transformer Magnetization Losses Using a Nonfiltered Voltage-Source Inverter (2013)
- Transformer Magnetizing Inrush Currents Using a Directly Coupled Voltage-Source Inverter (2013)
- Measurement system design and implementation for grid-connected marine substation (2013)
- FPGA Control Implementation of a Grid-Connected Current-Controlled Voltage-Source Inverter (2013)
- Grid Connection of Wave Power Farm Using an N-Level Cascaded H-Bridge Multilevel Inverter (2013)
- Performance of large arrays of point absorbing direct-driven wave energy converters (2013)
- Efficiency of a Directly Driven Generator for Hydrokinetic Energy Conversion (2013)
- Characteristics of the Operational Noise from Full Scale Wave Energy Converters in the Lysekil Project (2013)
- Utilizing cable winding and industrial robots to facilitate the manufacturing of electric machines (2013)
- Six-Degrees-of-Freedom (6-DOF) Work Object Positional Calibration Using a Robot-Held Proximity Sensor (2013)
- Analysis of linear wave power generator model with real sea experimental results (2013)
- Optimal Constant DC Link Voltage Operation of aWave Energy Converter (2013)
- On the velocity distribution for hydro-kinetic energy conversion from tidal currents and rivers (2013)
- Evaluation of a model for predicting the tidal velocity in fjord entrances (2013)
- On a Two Pole Motor for Electric Propulsion System (2013)
- Time Series-, Time-Frequency- and Spectral Analyses of Sensor Measurements in an Offshore Wave Energy Converter Based on Linear Generator Technology (2013)
- Implementation of Control System for Hydrokinetic Energy Converter (2013)
- Temperature Study in a Marine Substation for Wave Power (2012)
- Electric resonance-rectifier circuit for renewable energy conversion (2012)
- Temperature measurements in a linear generator and marine substation for wave power (2012)
- Electrical Motor Drivelines in Commercial All Electric Vehicles (2012)
- Experimental results from a linear wave power generator connected to a resonance circuit (2012)
- Total instantaneous energy transport in polychromatic fluid gravity waves at finite depth (2012)
- Experimental results from the operation of aggregated wave energy converters (2012)
- Azimuth-inclination angles and snatch load on a tight mooring system (2012)
- Estimation of Stress in the Inner Framework Structure of a Single Heaving Buoy Wave Energy Converter (2012)
- A Set-Up of 7 Laser Triangulation Sensors and a Draw-Wire Sensor for Measuring Relative Displacement of a Piston Rod Mechanical Lead-Through Transmission in an Offshore Wave Energy Converter on the Ocean Floor (2012)
- A Permanent Magnet Generator for Energy Conversion from Marine Currents (2012)
- Operation analysis of a wave energy converter under different load conditions (2011)
- Prediction of the Inductance in a Synchronous Linear Permanent Magnet Generator (2011)
- A resonant Two Body System for a point absorbing Wave Energy Converter with direct-driven linear generator (2011)
- A 225 kW Direct Driven PM Generator Adapted to a Vertical Axis Wind Turbine (2011)
- Gerador de ímãs permanentes de acionamento direto para turbina de eixo vertical (2011)
- Power coefficient measurement on a 12 kW straight bladed vertical axis wind turbine (2011)
- In-stream energy converters in a river (2011)
- Renewable energies (2011)
- A resonance circuit for electrical conversion systems (2011)
- Offshore wave power measurements (2011)
- Wave Buoy and Translator Motions - On-Site Measurements and Simulations (2011)
- Ocean wave energy absorption in response to wave period and amplitude (2011)
- Experimental Results From an Offshore Wave Energy Converter (2010)
- Fast aeroelastic model for straight bladed vertical axis wind and hydro turbines (2010)
- A Multi-Body Vortex Method Applied to Vertical Axis Wind Turbines (2010)
- Depth variation of energy transport in fluid gravity waves (2010)
- Special Issue - selected, expanded papers from EWTEC 2009 (2010)
- On the physics of power, energy and economics of renewable electric energy sources - Part I (2010)
- Offshore underwater substation for wave energy converter arrays (2010)
- On the physics of power, energy and economics of renewable electric energy sources - Part II (2010)
- Wave Power Absorption as a Function of Water Level and Wave Height (2010)
- Experimental results of rectification and filtration from an offshore wave energy system (2009)
- Study of aWave Energy Converter Connected to a Nonlinear Load (2009)
- Wave energy converter with enhanced amplitude response at frequencies coinciding with Swedish west coast sea states by use of a supplementary submerged body (2009)
- FEM simulations and experiments of different loading conditions for a 12 kW direct driven PM synchronous generator for wind power (2009)
- A review of the tidal current energy resource in Norway (2009)
- Design of an experimental setup for hydro-kinetic energy conversion (2009)
- Transport of energy in polychromatic fluid gravity waves (2009)
- Catch the wave to electricity (2009)
- High-voltage pulsed-power cable generator (2009)
- Wave Climate off the Swedish West Coast (2009)
- Matching a permanent magnet synchronous generator to a fixed pitch vertical axis turbine for marine current energy conversion (2009)
- Poynting theorem applied to cable wound generators (2008)
- Conformal mapping and efficient boundary element method without, boundary elements for fast vortex particle simulations (2008)
- Evaluation of different turbine concepts for wind power (2008)
- Simulations and experiments on a 12 kW direct driven PM synchronous generator for wind power (2008)
- Wave Energy from the North Sea (2008)
- Influence of Generator Damping on Peak Power and Variance of Power for a Direct Drive Wave Energy Converter (2008)
- A low-speed generator for energy conversion from marine currents – experimental validation of simulations (2008)
- A low-speed generator for energy conversion from marine currents (2008)
- Flywheel energy and power storage systems (2007)
- Flux Distribution in Linear Permanent-Magnet Synchronous Machines Including Longitudinal End Effects (2007)
- Wave power absorption (2007)
- Wave energy potential in the Baltic Sea and the Danish part of the North Sea, with reflections on the Skagerrak (2007)
- Coupled FEM and lumped circuit model of the electromagnetic response of coaxially insulated windings in two slot cores (2007)
- Rotor Dynamic Analysis of an Eccentric Hydropower Generator With Damper Winding for Reactive Load (2007)
- Direct electric energy conversion system for energy conversion from marine currents (2007)
- Direct electric energy conversion system for energy conversion from marine currents (2007)
- Inductive high voltage pulse generator based on resonance system (2007)
- Poynting Vector Analysis of Synchronous Generators Using Field Simulations (2007)
- Influence on the stability of generator rotors due to radial and tangential magnetic pull force (2007)
- Development of synchronous generators for Swedish hydropower (2007)
- Saturation Effects on Unbalanced Magnetic Pull in a Hydroelectric Generator With an Eccentric Rotor (2007)
- Investigating the overload capacity of a direct-driven synchronous permanent magnet wind turbine generator designed using high-voltage cable technology (2007)
- Farm size comparison with analytical model of linear generator wave energy converters (2007)
- Measuring air gap width of permanent magnet linear generators using search coil sensor (2007)
- Experimental results from sea trials of an offshore wave energy system (2007)
- Wave energy resources in sheltered sea areas (2006)
- Study of a Longitudinal Flux Permanent Magnet Linear Generator for Wave Energy Converters (2006)
- Detailed Study of the Magnetic Circuit in a Longitudinal Flux Permanent-Magnet Synchronous Linear Generator (2006)
- Theory and Experiment on an Elastically Moored Cylindrical Buoy (2006)
- An electrical approach to wave energy conversion (2006)
- An inductive 700 MW high voltage pulse generator (2006)
- Electromagnetic forces in the air gap of a permanent magnet linear generator at no-load (2006)
- Electromagnetic forces in the air gap of a permanent magnet linear generator at no load (2006)
- Relation between generator geometry and resistance in armature winding (2006)
- Design of a 12kW vertical axis wind turbine equipped with a direct driven PM synchronous generator (2006)
- Time stepping finite element analysis of variable speed synchronous generator with rectifier (2006)
- Detailed Study of the Magnetic Circuit in a Longitudinal Flux Permanent-Magnet Synchronous Linear Generator (2005)
- Hydrodynamic modelling of a direct drive wave energy converter (2005)
- Simulation of Wave-Energy Converter With Octagonal Linear Generator (2005)
- Simulated generator for wave energy extraction in deep water (2005)
- Multiphysics Simulation of Wave Energy to Electric Energy Conversion by Permanent Magnet Linear Generator (2005)
- Transient response of transformer with XLPE insulation cable winding design (2005)
- Transfer of transient surge voltage through XLPE cable winding transformer (Dryformer) circuits (2005)
- Case study of upgrading potential for a small hydro power station (2005)
- A time-dependent potential flow theory for the aerodynamics of vertical axis wind turbines (2005)
- Conversion of wave energy to electricity (2004)
- Upgrading Generators with new Tools and High Voltage Technology (2004)
- Closure on A wide-band lumped circuit model of eddy current losses in a coil with a coaxial insulation system and a stranded conductor (2004)
- A Wideband Lumped Circuit Model of the Terminal and Internal Electromagnetic Response of Rotating Machine Windings with a Coaxial Insulation System (2004)
- Simulation of a 100 kW permanent magnet octagonal linear generator for ocean wave energy conversion and utilization (2004)
- Advances in Online Monitoring and Localization of Partial Discharges in Large Rotating Machines (2004)
- Wave energy transmission system concepts for linear generator arrays (2004)
- Theory and Simulations of an End Stop Solution in a Linear Wave Power Generator
- Power Production by Linear Wave Energy Converters of Point Absorber Type with Vertical Cylindrical Buoys during Various Sea States
- Toroidal Buoy for Point Absorver WEC with Focus on Added Mass and Overloads
- Permanent magnets by current equivalent models in synchronous machines
- Iron loss models: A review of simplified models of magnetization losses in electrical machines
- A Comparative Analysis of Linear and Nonlinear Control of Wave Energy Converter for a Force Control Application

#### Böcker

#### Kapitel

#### Konferenser

- Data Flow Management Requirements for Virtual Testing of Highly Automated Vehicles (2022)
- Integration of Vulnerable Road Users Behavior into a Virtual Test Environment for Highly Automated Mobility Systems (2022)
- What inﬂuences the Generator Damping atPartial Stator Overlap in a Linear Generator for Wave Power? (2021)
- End Effects and Geometric Compensation in a Linear Permanent Magnet Synchronous Generator with Buried Topology (2020)
- Integration of real-world project tasks in a course on automation and robot engineering (2019)
- Marine Renewable Energy Sources for Desalination, Generating Freshwater and Lithium (2019)
- Time Domain Analysis of the Lightning Interaction with Wave Energy Converters (2018)
- Experimental Test of Grid Connected VSC to Improve the Power Quality in a Wave Power System (2018)
- Optimization of Resistive Load for a Wave Energy Converter with a Linear Generator Power Take Off (2018)
- Electrical Approach to Output Power Optimization for a Point Absorbing Wave Energy Converter with a Direct Drive Linear Generator Power Take Off (2017)
- Magnetic End LeakageFlux in a Spoke Type Rotor Permanent Magnet SynchronousGenerator (2017)
- Buoy geometry and its inﬂuence on survivability for apoint absorbing wave energy converter (2017)
- Power And Energy Needed For Starting A Vertical Axis Marine Current Turbine (2017)
- Experimental study of generator damping at partial stator overlap in a linear generator for wave power (2017)
- Linear Generator with Different Types of Ferrite Permanent Magnets for Wave Energy Conversion (2017)
- Survivability of a Point Absorbing Wave Energy Converter Impacted by Tsunami Waves (2017)
- Experimental Verification of a Back-to-Back 2L-3L Grid Connection System for a Marine Current Energy Converter (2016)
- Robotized manufacturing of rubber components for commercialization of the Uppsala University wave energy converter concept (2016)
- Offshore Deployment of Marine Substation in the Lysekil Research Site (2015)
- DC-Link Stress Analysis for the Grid Connection of Point Absorber Type Wave Energy Converters (2015)
- Wave loads on a point-absorbing wave energy device in extreme waves (2015)
- Optimization of the Power Absorption for a Linear Generator Wave Energy Converter (2015)
- Studying the Wake of a Marine Current Turbine Using an Acoustic Doppler Current Profiler (2015)
- CFD Analysis on the Effect of the Tidal Gratingin Opposite Directions (2015)
- Wave Energy Research at Uppsala University and The Lysekil Research Site, Sweden (2015)
- Measurement System for Evaluating Wanted and Unwanted Forces on a Point Absorbing Wave Energy Converter during Offshore Operation (2015)
- Evaluation of Damping Strategies for Maximum Power Extraction from a Wave Energy Converter with a Linear Generator (2014)
- Measurements of tidal current velocities in the Folda fjord, Norway, with the use of a vessel mounted ADCP (2014)
- Offshore Deployment of Point Absorbing Wave Energy Converters with a Direct Driven Linear Generator Power Take-Off at the Lysekil Test Site (2014)
- Risk based estimation of failure in a steel wire used for the wave energy converter connection line (2014)
- Performance enhancement of a vertical axis cross-flow hydro-kinetic energy converter (2014)
- Inverter topology with integrated on-load tap change for grid-connection of renewable electric energy sources (2014)
- Discontinuous conduction mode of a three-level boost DC-DC converter and its merits and limits for voltage cross regulation applications (2014)
- Measurements of Extreme Forces on a Wave Energy Converter of Point Absorber Type and Estimation of Added Mass of Cylindrical Buoy (2014)
- Analytical and numerical approaches to optimizing fluid-structure interactions in wave energy parks (2014)
- Force in the connection line for a wave energy converter (2014)
- Preparing the Uppsala University wave energy converter generator for large-scale production (2014)
- Robotized stacking of the Uppsala University wave energy converter generator stator (2014)
- Measurement System For Wave Energy Converter - Design And Implementation (2014)
- Current Ripple Evaluation in Dual Three-Phase Inverters for Open-End Winding EV Drives (2014)
- Analysis of Three-level Buck-Boost Converter Operation for Improved Renewable Energy Conversion and Smart Grid Integration (2014)
- Ideal Analytical Expression of the Magnetic Circuit in a Permanent Magnet Linear Machine (2013)
- Experimental Verifications of Offshore Marine Substation for Grid-Connection of Wave Energy Farm (2013)
- Marine substation design for grid-connection of a research wave power plant on the Swedish West coast (2013)
- Hydroacoustic measurements of the radiated noise from Wave Energy Converters in the Lysekil project and project WESA (2013)
- Status Update of the Wave Energy Research at Uppsala University (2013)
- The Söderfors Project (2013)
- Control and Implementation of Three Level BoostConverter for Load Voltage Regulation (2013)
- Wireless System for Tidal Effect Compensation in the Lysekil Research Site (2012)
- Electromagnetic, Mechanical and Manufacturing Properties for Cable Wound Direct-Drive PM Linear Generators for Offshore Environments (2012)
- Simulation of Hydrodynamical Forces on a Buoy - a Comparison Between Two Computational Approaches (2012)
- Lysekil Research Site, Sweden (2011)
- Optimization of the Dimensions of a Gravity-based Wave Energy Converter Foundation Based on Heave and Surge Forces (2011)
- Dynamic stability of an electricity generation system based on renewable energy (2011)
- Sensors and Measurements Inside the Second and Third Wave Energy Converter at the Lysekil Research Site. (2011)
- The Söderfors Project (2011)
- Temperature measurements in a linear generator and marine substation for wave power (2010)
- A 225 kW direct driven PM generator for a vertical axis wind turbine (2010)
- Description of a torus shaped buoy for wave energy point absorber (2010)
- Space vector modulation method to balance the neutral point voltage for a three-level inverter (2010)
- Predictive current controller for a grid connected three level inverter with reactive power control (2010)
- Direct Predictive Current Control of GridConnected Neutral Point Clamped Inverterfor Wave Power Extraction (2010)
- Direct Predictive Current Control of Grid Connected Neutral Point Clamped Inverter for Wave Power Extraction (2010)
- Coatings for Renewable Energy (2009)
- Design proposal of electrical system for linear generator wave power plants (2009)
- Influence of a Varying Vertical Velocity Profile on Turbine Efficiency for a Vertical Axis Marine Current Turbine, (2009)
- A parameter study of the influence of struts on the performance of a vertical-axis marine current turbine. (2009)
- Numerical modeling of a river site for in-stream energy converters (2009)
- A Design Study of Marine Current Turbine-Generator Combinations (2009)
- Laboratory experimental verification of a marine substation (2009)
- Determining the service life of a steel wire under a working load in the Wave Energy Converter (WEC) (2009)
- Description of the control and measurement system used in the Low Voltage Marine Substation at the Lysekil research site (2009)
- Tracking a Wave Power Buoy Using a Network Camera (2009)
- Experimental results from an offshore wave energy converter (2008)
- On the Physics and Economics of Renewable Electric Energy Sources -- part I utilization (2008)
- On the Physics and Economics of Renewable Electric Energy Sources -- part II engineering (2008)
- The Lysekil Wave Power Project: Status Update (2008)
- Offshore experiments on a direct-driven Wave Energy Converter (2007)
- 45 GW pulsed-power generator (2007)
- A direct drive generator for marine current energy conversion - first experimental results (2007)
- Influence of Generator Damping on Peak Power and Variance of Power for a Direct Drive Wave Energy Coverter (2007)
- A direct drive generator for marine current energy conversion - first experimental results (2007)
- Experimental setup (2007)
- High Voltage Generators; Ideas behind them and Operation Data (2006)
- Analytical and circuit simulations of linear generators in farm (2006)
- Generators and electrical systems for direct drive energy conversion (2006)
- A direct drive wave energy converter (2005)
- Experiments at Islandsberg on the west coast of Sweden in preparation of the construction of a pilot wave power plant (2005)
- Concept of a Direct Drive Permanent Magnetized Generator for Experimental Verification of Marine Current Power Conversion (2005)
- Permanent magnetized generator for marine current power conversion (2005)
- The Marine Current Power Project at the Swedish Centre for Renewable Electric Energy Conversion (2005)
- Full-Scale Testing of PM Linear Generator for Point Absorber WEC (2005)
- Rotor configuration impact on generator ventilation needs (2004)
- Rotating and Linear Syncronous Generators for Renewable Electric Energy Conversion (2004)
- Simulated Response of a Linear Generator Wave Energy Converter (2004)
- Dynamics of a Linear Generator for Wave Energy Conversion (2004)
- Simulation of cogging in a 100kW permanent magnet octagonal linear generator for ocean wave conversion (2004)
- Converting kinetic energy in small watercourses using direct drive generators (2004)
- Design of a very low speed PM generator for the patented KOBOLD tidal current turbine (2004)
- Permanent magnet fixation concepts for linear generator (2003)
- Simulation of Direct Drive Generators Designed for Underwater Vertical Axis Turbines (2003)
- Rotor Concept Comparison for Underwater Power Generation (2002)