Jens Engström
YOU?
Author Swipe
View article: Desalination and wave power for freshwater supply on Gotland
Desalination and wave power for freshwater supply on Gotland Open
Reliable access to drinking water and electricity can be a challenge, especially on islands. In this paper, desalination systems powered stand-alone by renewable energy sources are discussed, with a focus on wave power for the Swedish isla…
View article: Investigation on the extreme peak mooring force distribution of a point absorber wave energy converter with and without a survivability control system
Investigation on the extreme peak mooring force distribution of a point absorber wave energy converter with and without a survivability control system Open
To determine the optimal design of the wave energy converter (WEC) that can withstand extreme waveconditions, the short- and long-term extreme responses of the system need to be determined. This paper focuses on the extreme peak force dist…
View article: Fast time-domain model for an array of interactive point-absorbers
Fast time-domain model for an array of interactive point-absorbers Open
A fast time-domain model is developed for an array of six interacting point-absorber wave energy converters, based on the design originated at Uppsala University. The point-absorbers are placed in a symmetric grid, were each row cont…
View article: Offshore Measurements and Numerical Validation of the Mooring Forces on a 1:5 Scale Buoy
Offshore Measurements and Numerical Validation of the Mooring Forces on a 1:5 Scale Buoy Open
Wave energy conversion is a renewable energy technology with a promising potential. Although it has been developed for more than 200 years, the technology is still far from mature. The survivability in extreme weather conditions is a key p…
View article: Validation of a CFD model for wave energy system dynamics in extreme waves
Validation of a CFD model for wave energy system dynamics in extreme waves Open
The design of wave energy converters should rely on numerical models that are able to estimate accurately the dynamics and loads in extreme wave conditions. A high-fidelity CFD model of a 1:30 scale point-absorber is developed and validate…
View article: Environmental design load for the line force of a point-absorber wave energy converter
Environmental design load for the line force of a point-absorber wave energy converter Open
To ensure a reliable operation over the life time of wave energy converters (WECs), a number of load cases need to be considered according to international standards for marine structures to determine an optimal design. This paper outlines…
View article: Experimental investigation of a point-absorber wave energy converter response in different wave-type representations of extreme sea states
Experimental investigation of a point-absorber wave energy converter response in different wave-type representations of extreme sea states Open
The experimental results of a 1:30 scaled wave tank experiment of a point-absorber in extreme sea states and intermediate water depth are studied. The effect of the PTO damping parameter and different non-linear phenomena in extreme wave c…
View article: Considerations on prediction horizon and dissipative losses for wave energy converters
Considerations on prediction horizon and dissipative losses for wave energy converters Open
The non‐causal optimal control law for wave energy converters leads to a requirement of predicting waves and wave forces over a future horizon. Using examples of generic body shapes and oscillation modes, the authors show through computati…
View article: Response of Point-Absorbing Wave Energy Conversion System in 50-Years Return Period Extreme Focused Waves
Response of Point-Absorbing Wave Energy Conversion System in 50-Years Return Period Extreme Focused Waves Open
This work evaluates the survivability of a point-absorbing wave energy converter at sea states along and inside the 50-year environmental contour for a selected-site in North Sea, by utilizing CFD simulations. Focused wave groups based on …
View article: Improving electric power generation of a standalone wave energy converter via optimal electric load control
Improving electric power generation of a standalone wave energy converter via optimal electric load control Open
This paper aims to investigate electric dynamics and improve electric power generation of an isolated wave energy converter that uses a linear permanent magnet generator as the power take-off system, excited by regular or irregular waves. …
View article: Comparison of Wave Energy Park Layouts by Experimental and Numerical Methods
Comparison of Wave Energy Park Layouts by Experimental and Numerical Methods Open
An experimental campaign of arrays with direct-driven wave energy converters of point-absorbing type is presented. The arrays consist of six identical floats, moving in six degrees of freedom, and six rotating power take-off systems, based…
View article: Wave Energy Converter Power Take-Off System Scaling and Physical Modelling
Wave Energy Converter Power Take-Off System Scaling and Physical Modelling Open
Absorbing wave power from oceans for producing a usable form of energy represents an attractive challenge, which for the most part concerns the development and integration, in a wave energy device, of a reliable, efficient and cost-effecti…
View article: Variable renewable energy sources for powering reverse osmosis desalination, with a case study of wave powered desalination for Kilifi, Kenya
Variable renewable energy sources for powering reverse osmosis desalination, with a case study of wave powered desalination for Kilifi, Kenya Open
An analysis of reverse osmosis powered by ocean wave power is provided. A commercially available desalination system is connected via a DC/AC converter to a variable DC source and the input voltage is altered to emulate the response of a r…
View article: Loads on a Point-Absorber Wave Energy Converter in Regular and Focused Extreme Wave Events
Loads on a Point-Absorber Wave Energy Converter in Regular and Focused Extreme Wave Events Open
Accurate modeling and prediction of extreme loads for survivability is of crucial importance if wave energy is to become commercially viable. The fundamental differences in scale and dynamics from traditional offshore structures, as well a…
View article: Advances and Challenges in Wave Energy Park Optimization—A Review
Advances and Challenges in Wave Energy Park Optimization—A Review Open
A commercial wave energy system will typically consist of many interacting wave energy converters installed in a park. The performance of the park depends on many parameters such as array layout and number of devices, and may be evaluated …
View article: Cover Image
Cover Image Open
The cover image is based on the Research Article Energy absorption from parks of point-absorbing wave energy converters in the Swedish exclusive economic zone by Jens Engström et al., https://doi.org/10.1002/ese3.507.
View article: Energy absorption from parks of point‐absorbing wave energy converters in the Swedish exclusive economic zone
Energy absorption from parks of point‐absorbing wave energy converters in the Swedish exclusive economic zone Open
In a future energy system based on renewable energy sources, wave energy will most likely play a role due to its high energy potential and low intermittency. The power production from parks of wave energy converters of point absorber type …
View article: On the calibration of a WEC-Sim model for heaving point absorbers
On the calibration of a WEC-Sim model for heaving point absorbers Open
The outcomes of reliability based design\nmethods applied to wave energy converters (WECs) in the\nearly stages of development depend heavily on the\nuncertainty in the variables used to determine the loads\nacting on, and responses of, de…
View article: A Model Free Control Based on Machine Learning for Energy Converters in an Array
A Model Free Control Based on Machine Learning for Energy Converters in an Array Open
This paper introduces a machine learning based control strategy for energy converter arrays designed to work under realistic conditions where the optimal control parameter can not be obtained analytically. The control strategy neither reli…
View article: Experimental and Numerical Collaborative Latching Control of Wave Energy Converter Arrays
Experimental and Numerical Collaborative Latching Control of Wave Energy Converter Arrays Open
A challenge while applying latching control on a wave energy converter (WEC) is to find a reliable and robust control strategy working in irregular waves and handling the non-ideal behavior of real WECs. In this paper, a robust and model-f…
View article: A model free control based on machine learning forenergy converters in an array
A model free control based on machine learning forenergy converters in an array Open
This paper introduces a model-free, "on-the-fly" learning control strategy for arrays of energy converters with adjustable generator damping. The devices are arranged so that they are affected simultaneously by the energy medium.…
View article: Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off
Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off Open
An alternating rotatory generator using an eddy current break is developed as a physical scale model of a direct-driven floating point absorber power take-off (PTO) for wave tank tests. It is shown that this design is a simple and cost-eff…
View article: Wave Power as Solution for Off-Grid Water Desalination Systems: Resource Characterization for Kilifi-Kenya
Wave Power as Solution for Off-Grid Water Desalination Systems: Resource Characterization for Kilifi-Kenya Open
Freshwater scarcity is one of humanity’s reoccurring problems that hamper socio-economic development in many regions across the globe. In coastal areas, seawater can be desalinated through reverse osmosis (RO) and transformed into freshwat…