Cost of energy assessment methodology for offshore AC and DC wind power plants

Valcan, Dumitru-Mihai; Kjar, Philip C.; Helle, Lars; Sahukari, Sridhar; Haj-Maharsi, Mohamed Y.; Singh, Sunita

doi:10.1109/optim.2012.6231991

Cited by 15 publications

(7 citation statements)

References 20 publications

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“…Offshore platform for AC and DC based WPPs. The cost of an offshore substation platform for AC WPPs is computed as [33] C pl AC ¼ 2534 þ 88:7N wt P wt (14) where N wt is the number of wind turbines within the OWPP and P wt is the wind turbine rated power. With regard to the DC OWPPs study, there exist various types of offshore platform that could be considered such as feeder, collector and main platform.…”

Section: Capital Expenditure Functionsmentioning

confidence: 99%

Feasibility analysis of offshore wind power plants with DC collection grid

Gil¹,

Domínguez‐García²,

Díaz‐González³

et al. 2015

Renewable Energy

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Section: Capital Expenditure Functionsmentioning

confidence: 99%

Feasibility analysis of offshore wind power plants with DC collection grid

Gil¹,

Domínguez‐García²,

Díaz‐González³

et al. 2015

Renewable Energy

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“…It has been shown that the generated electrical power from offshore wind parks located far away from the shore can be collected with lower costs if MVDC collection grids are used instead of the existing MVAC collection grids [1]. High-power DC-DC converters are required to realize the MVDC collection grid.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Lifetime of Q2L-MMC-DAB’s Switches for Wind Turbine Applications

Khanzadeh

Tang

Thiringer

2020

2020 Fifteenth International Conference on Ecological Vehicles and Renewable Energies (EVER)

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This paper studies the lifetime of semiconductor switches of a dual-active-bridge (DAB) DC-DC converter for wind turbine applications. Quasi-twolevel operating modular multilevel converters (MMC) are used as the building blocks of the DAB converter. One of the established lifetime models is used for the lifetime estimation of the switches. Measurement data of an onshore wind turbine for three hundred days is used as the mission profile. It is shown that the short-term thermal cycles (cycles with frequency in the range of switching frequency) are detrimental to the lifetime estimation of the auxiliary switches of the MMCs' submodules. Thus, neglecting the short-term thermal cycles will overestimate the lifetime of the auxiliary switches by several orders of magnitude. On the other hand, these cycles will not affect the lifetime of the bypass switches considerably. It is also shown that the thermal stress on the secondary-side auxiliary switches is more severe than the primary-side ones. It is suggested that two parallel devices should be used for the secondary-side auxiliary switches; as a consequence, a reasonable lifetime is achieved for the secondary-side auxiliary switches.

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“…These issues may become of increasing importance as the capacity and area of offshore wind farms increase. A medium-voltage DC collection grid also has the potential to reduce losses through the use of medium-voltage converters and better optimisation of conversion stages [1]. Additionally, a DC collection grid may reduce the size and weight of the required plant and power units [1].…”

Section: Introductionmentioning

confidence: 99%

“…A medium-voltage DC collection grid also has the potential to reduce losses through the use of medium-voltage converters and better optimisation of conversion stages [1]. Additionally, a DC collection grid may reduce the size and weight of the required plant and power units [1]. Present offshore farms connect to conventional 50 or 60Hz AC systems by employing mainsfrequency transformers to step up the generator output voltage to collection network voltage levels.…”

Section: Introductionmentioning

confidence: 99%

Modular input‐parallel output‐series DC/DC converter control with fault detection and redundancy

Lian

Adam

Holliday

et al. 2016

IET Generation, Transmission & Distribution

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This version is available at https://strathprints.strath.ac.uk/54599/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the AbstractLarge offshore wind farms will require an extensive sub-sea power network to provide internal interconnection. Present solutions are based around conventional medium-voltage AC architectures. This paper proposes an alternative DC collection network based around modular DC/DC converters with input-parallel-output-series (IPOS) connection. Smallsignal analysis of the converter is presented, to assist in control scheme development for the converter input and output stages. A Lyapunov controller is embedded within the conventional output voltage sharing control loop. A masterslave control scheme is proposed to ensure power sharing under a range of operating conditions, and provides faulttolerant operation since the status of 'master' can be reallocated in the event that the present 'master' module fails.

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Cost of energy assessment methodology for offshore AC and DC wind power plants

Cited by 15 publications

References 20 publications

Feasibility analysis of offshore wind power plants with DC collection grid

Feasibility analysis of offshore wind power plants with DC collection grid

A Study on the Lifetime of Q2L-MMC-DAB’s Switches for Wind Turbine Applications

Modular input‐parallel output‐series DC/DC converter control with fault detection and redundancy

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