Offshore Wind Energy Technology

Anaya‐Lara, Olimpo; Tande, John Olav Giæver; Uhlen, Kjetil; Merz, Karl

doi:10.1002/9781119097808

Cited by 39 publications

(36 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Then after service work, the crews are again transported from the wind tower to the port or the residential ship. To minimize service costs [28], this process is subject to optimization regarding both its management [22,29,30], and the safe steering of the ship along a given route [31][32][33][34][35][36]. CTVs are intensively used during the operation of offshore wind farms and require frequent refueling, which is both expensive and time consuming.…”

Section: Figurementioning

confidence: 99%

“…A typical single service brigade consists of two or three people. The duration of a CTV's stay outside the port may be from one to several days [30]. During this time the CTV can run a daily route of about 100 NM (180 km), depending on the distance of the wind farm from the port or residential unit (OAV) and the extent of the wind farm, with average distance between wind towers being 1.1 NM (2 km).…”

Section: Ctv Operations Characteristicsmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of the Use of Electric Drive Systems for Crew Transfer Vessels Servicing Offshore Wind Farms

Łebkowski

2020

Energies

View full text Add to dashboard Cite

The article presents issues related to the possibility of using electric propulsion systems in units used to transport crews servicing wind towers at sea. Offshore wind energy issues are discussed. Proposals for electric propulsion systems that could be used on units for transporting crews servicing offshore wind farms are presented. The possibility of using purely electrical drive systems or hybrid drive systems operating in a diesel-electric configuration is analyzed. By observing the motion of real CTV units, based on the data from the MarineTraffic service, a mathematical simulation model was developed, for which a number of simulations were carried out in the Modelica environment. The developed mathematical model takes into account the dynamic loads acting on the ship’s hull, hydrodynamic resistances, electric and diesel propulsion systems’ properties together with their individual elements’ characteristics. The tests of the electric propulsion system showed reduced fuel consumption (approx. 60%) and harmful gas emissions to the atmosphere (approximately 70%) in relation to conventional, internal combustion engine propulsion.

show abstract

Section: Figurementioning

confidence: 99%

Section: Ctv Operations Characteristicsmentioning

confidence: 99%

Analysis of the Use of Electric Drive Systems for Crew Transfer Vessels Servicing Offshore Wind Farms

Łebkowski

2020

Energies

View full text Add to dashboard Cite

show abstract

“…Note that the electrical grid architecture of a WEC farm may be expected to be very similar to this of offshore windfarms equipped with Type 4 wind turbines using fully rated back-to-back AC/DC/AC converters [25]. Such electronic interface allows to limit the fault current to a value that is barely above the rated current [26].…”

Section: Case Study 2: Short-circuit Conditionsmentioning

confidence: 99%

Modeling of a wave farm export cable for electro-thermal sizing studies

et al. 2020

View full text Add to dashboard Cite

So far, only few studies have addressed the techno-economic optimization of an export cable sizing in the specific case of wave energy farms. However, in these works, the cable current rating is determined based on conservative steady-state conditions regarding the farm current output whereas considering dynamic conditions may be more relevant in the case of wave energy applications. However, this implies developing and using dedicated electro-thermal models, which poses a challenge regarding the determination of the modeling fineness level to be adopted for such studies. Hence, this paper presents several numerical models, the most refined of which is compared with experimental data, as well as well as preliminary cable sizing studies. Contrary to previous works in this field, the fluctuating nature of wave energy is considered here, thus allowing for more realistic results.

show abstract

“…This is due to the logically permitted decoupled approach. Global forces will have to be of importance nevertheless, however excitation to resonance is unlikely from global forces [22]. Starting with a global model and analysis, the loading on the drivetrain could be obtained and by the detailed model gear loads and load response analysis will be performed simultaneously to get instant conditions.…”

Section: Offshore Wind Industrymentioning

confidence: 99%

On Digital Twin Condition Monitoring Approach for Drivetrains in Marine Applications

Johansen

Nejad

2019

Volume 10: Ocean Renewable Energy

View full text Add to dashboard Cite

A digital twin is a virtual representation of a system containing all information available on site. This paper presents condition monitoring of drivetrains in marine power transmission systems through digital twin approach. A literature review regarding current operations concerning maintenance approaches in todays practices are covered. State-of-the-art fault detection in drivetrains is discussed, founded in condition monitoring, data-based schemes and model-based approaches, and the digital twin approach is introduced. It is debated that a model-based approach utilizing a digital twin could be recommended for fault detection of drivetrains. By employing a digital twin, fault detection would be extended to relatively highly diagnostic and predictive maintenance programme, and operation and maintenance costs could be reduced. A holistic model system approach is considered, and methodologies of digital twin design are covered. A physical-based model rather than a data based model is considered, however there are no clear answer whereas which type is beneficial. That case is mostly answered by the amount of data available. Designing the model introduces several pitfalls depending on the relevant system, and the advantages, disadvantages and appropriate applications are discussed. For a drivetrain it is found that multi-body simulation is advised for the creation of a digital twin model. A digital twin of a simple drivetrain test rig is made, and different modelling approaches were implemented to investigate levels of accuracy. Reference values were derived empirically by attaching sensors to the drivetrain during operation in the test rig. Modelling with a low fidelity model showed high accuracy, however it would lack several modules required for it to be called a digital twin. The higher fidelity model showed that finding the stiffness parameter proves challenging, due to high stiffness sensitivity as the experimental modelling demonstrates. Two industries that could have significant benefits from implementing digital twins are discussed; the offshore wind industry and shipping. Both have valuable assets, with reliability sensitive systems and high costs of downtime and maintenance. Regarding the shipping industry an industrial case study is done. Area of extra focus is operations of Ro-Ro (roll on-roll off) vessels. The vessels in the case study are managed by Wilhelmsen Ship Management and a discussion of the implementation of digital twins in this sector is comprised in this article.

show abstract

Offshore Wind Energy Technology

Cited by 39 publications

References 0 publications

Analysis of the Use of Electric Drive Systems for Crew Transfer Vessels Servicing Offshore Wind Farms

Analysis of the Use of Electric Drive Systems for Crew Transfer Vessels Servicing Offshore Wind Farms

Modeling of a wave farm export cable for electro-thermal sizing studies

On Digital Twin Condition Monitoring Approach for Drivetrains in Marine Applications

Contact Info

Product

Resources

About