GR
G. Rossi
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This thesis project titled “Routing Methods and Design Considerations for Unmoored Floating Offshore Wind Turbine Concepts” investigates the emerging technological deployment of Unmoored Floating Offshore Wind Turbines (UFOWTs), which are operated via autonomous routing to navigate their constantly changing wind and generation sites. This form of wind energy conversion offers the opportunity for wind energy harnessing further offshore and in deeper water sites than currently possible, along with theoretically shorter deployment times. These two advantages, along with others identified for this technology, aid the upcoming 2050 goals of the Net-Zero Coalition for renewable energy generation.
The current prevailing research focus on UFOWT systems in literature is concept development and modelling to demonstrate pre-feasibility in terms of stability, costs, and energy balance. This thesis aims to evaluate two prevailing routing methods and system designs of UFOWT concepts and to investigate how operational methods, design choices, and site conditions interact with one another to affect UFOWT performance.
The research workflow of this project can be divided into three processes. The first involved a literature review that provided the author with the necessary understanding of existing work in the realm of UFOWTs, which provided guidance for the research question formulation. This first research process blended into the second, which involved defining two separate UFOWT designs to investigate in this project, each with their individual routing method: Alternating Navigation and Generation (ANG) and Continuous Navigation and Generation (CNG) methods. The system modelling scope was defined in this step, setting assumptions for aspects that could not be covered in the scope of work. The third process involved building the simulation environment for the UFOWTs from the ground up, done in MATLAB (R2021a version) using weather data from the Copernicus ERA5 open-source database.
The results of this project were simulated routes and energy yields for operation of each UFOWT design in the North Sea, West, and Eastern Mediterranean Sea regions. Using the same UFOWT design in all regions showed poor performance in lower average wind speed areas, due to lower generation and increased costs associated with further distances travelled and dictated by the routing algorithm. Over the period of 10 years for which data was available to simulate both systems, it was found that there are additional considerations to be made for UFOWT operation which influence overall performance, for instance starting location and wind speed direction trends. Operation of the two UFOWT designs was simulated in 3-month intervals from 2012 to 2021, which yielded an average performance of the ANG system nearly twice as high as the CNG system, in terms of capacity factor and simulated onboard fuel conversion. ...
The current prevailing research focus on UFOWT systems in literature is concept development and modelling to demonstrate pre-feasibility in terms of stability, costs, and energy balance. This thesis aims to evaluate two prevailing routing methods and system designs of UFOWT concepts and to investigate how operational methods, design choices, and site conditions interact with one another to affect UFOWT performance.
The research workflow of this project can be divided into three processes. The first involved a literature review that provided the author with the necessary understanding of existing work in the realm of UFOWTs, which provided guidance for the research question formulation. This first research process blended into the second, which involved defining two separate UFOWT designs to investigate in this project, each with their individual routing method: Alternating Navigation and Generation (ANG) and Continuous Navigation and Generation (CNG) methods. The system modelling scope was defined in this step, setting assumptions for aspects that could not be covered in the scope of work. The third process involved building the simulation environment for the UFOWTs from the ground up, done in MATLAB (R2021a version) using weather data from the Copernicus ERA5 open-source database.
The results of this project were simulated routes and energy yields for operation of each UFOWT design in the North Sea, West, and Eastern Mediterranean Sea regions. Using the same UFOWT design in all regions showed poor performance in lower average wind speed areas, due to lower generation and increased costs associated with further distances travelled and dictated by the routing algorithm. Over the period of 10 years for which data was available to simulate both systems, it was found that there are additional considerations to be made for UFOWT operation which influence overall performance, for instance starting location and wind speed direction trends. Operation of the two UFOWT designs was simulated in 3-month intervals from 2012 to 2021, which yielded an average performance of the ANG system nearly twice as high as the CNG system, in terms of capacity factor and simulated onboard fuel conversion. ...
This thesis project titled “Routing Methods and Design Considerations for Unmoored Floating Offshore Wind Turbine Concepts” investigates the emerging technological deployment of Unmoored Floating Offshore Wind Turbines (UFOWTs), which are operated via autonomous routing to navigate their constantly changing wind and generation sites. This form of wind energy conversion offers the opportunity for wind energy harnessing further offshore and in deeper water sites than currently possible, along with theoretically shorter deployment times. These two advantages, along with others identified for this technology, aid the upcoming 2050 goals of the Net-Zero Coalition for renewable energy generation.
The current prevailing research focus on UFOWT systems in literature is concept development and modelling to demonstrate pre-feasibility in terms of stability, costs, and energy balance. This thesis aims to evaluate two prevailing routing methods and system designs of UFOWT concepts and to investigate how operational methods, design choices, and site conditions interact with one another to affect UFOWT performance.
The research workflow of this project can be divided into three processes. The first involved a literature review that provided the author with the necessary understanding of existing work in the realm of UFOWTs, which provided guidance for the research question formulation. This first research process blended into the second, which involved defining two separate UFOWT designs to investigate in this project, each with their individual routing method: Alternating Navigation and Generation (ANG) and Continuous Navigation and Generation (CNG) methods. The system modelling scope was defined in this step, setting assumptions for aspects that could not be covered in the scope of work. The third process involved building the simulation environment for the UFOWTs from the ground up, done in MATLAB (R2021a version) using weather data from the Copernicus ERA5 open-source database.
The results of this project were simulated routes and energy yields for operation of each UFOWT design in the North Sea, West, and Eastern Mediterranean Sea regions. Using the same UFOWT design in all regions showed poor performance in lower average wind speed areas, due to lower generation and increased costs associated with further distances travelled and dictated by the routing algorithm. Over the period of 10 years for which data was available to simulate both systems, it was found that there are additional considerations to be made for UFOWT operation which influence overall performance, for instance starting location and wind speed direction trends. Operation of the two UFOWT designs was simulated in 3-month intervals from 2012 to 2021, which yielded an average performance of the ANG system nearly twice as high as the CNG system, in terms of capacity factor and simulated onboard fuel conversion.
The current prevailing research focus on UFOWT systems in literature is concept development and modelling to demonstrate pre-feasibility in terms of stability, costs, and energy balance. This thesis aims to evaluate two prevailing routing methods and system designs of UFOWT concepts and to investigate how operational methods, design choices, and site conditions interact with one another to affect UFOWT performance.
The research workflow of this project can be divided into three processes. The first involved a literature review that provided the author with the necessary understanding of existing work in the realm of UFOWTs, which provided guidance for the research question formulation. This first research process blended into the second, which involved defining two separate UFOWT designs to investigate in this project, each with their individual routing method: Alternating Navigation and Generation (ANG) and Continuous Navigation and Generation (CNG) methods. The system modelling scope was defined in this step, setting assumptions for aspects that could not be covered in the scope of work. The third process involved building the simulation environment for the UFOWTs from the ground up, done in MATLAB (R2021a version) using weather data from the Copernicus ERA5 open-source database.
The results of this project were simulated routes and energy yields for operation of each UFOWT design in the North Sea, West, and Eastern Mediterranean Sea regions. Using the same UFOWT design in all regions showed poor performance in lower average wind speed areas, due to lower generation and increased costs associated with further distances travelled and dictated by the routing algorithm. Over the period of 10 years for which data was available to simulate both systems, it was found that there are additional considerations to be made for UFOWT operation which influence overall performance, for instance starting location and wind speed direction trends. Operation of the two UFOWT designs was simulated in 3-month intervals from 2012 to 2021, which yielded an average performance of the ANG system nearly twice as high as the CNG system, in terms of capacity factor and simulated onboard fuel conversion.