Selection of DC/DC converter for offshore wind farms with MVDC power collection

Dincan, Catalin Gabriel; Kjær, P.C.; Chen, Yu-hsing; Nielsen, Stig-Munk; Bak, Claus Leth

doi:10.23919/epe17ecceeurope.2017.8099408

Cited by 11 publications

(15 citation statements)

References 15 publications

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“…Fig. 13 represents the curves obtained for a reduced LVDC bus [i.e.,v 1 (t) < V 1 ], which in wind energy is the typical scenario for low power generation [8], [37]. These results show that the power controller naturally adapts to the LVDC operating point and the passivity compliance is kept.…”

Section: Passivity Compliancementioning

confidence: 89%

“…Pref, i1, v1 Therefore, the average value and ripple may depend on the speed and active power from the wind turbine generator [8], which is explicitly considered in the HIL validation (cf. section IV).…”

Section: Digital Controller V2mentioning

confidence: 99%

“…1(b). A controlled or uncontrolled rectifier can be employed to convert ac to dc at the LV side [7], [8]. Subsequently a dual active bridge (DAB) is considered in this work to deliver active power from low voltage dc (LVDC) to MVDC.…”

Section: Introductionmentioning

confidence: 99%

“…ii) MFTs with a high power density are also reported [13], [14], [19]. iii) solutions at a power system level have been explored [1], [8], [20], [21]. iv) a bottleneck for MVDC technology is the lack of commercially available protection devices [22]- [24]; efforts to develop cost-effective protection solutions have been provided, recently [24], [25].…”

Section: Introductionmentioning

confidence: 99%

“…Fig. 2 shows a simplification suitable for the MVDC collection and distribution of the DC wind farm concept analyzed in [2], [7], [8]. The lumped admittance model that groups all the wind turbine generators is defined as Y total G (ω), with Y WT 1 (ω), Y WT 2 (ω) (and so on) defining individual wind turbine systems.…”

Section: Introductionmentioning

confidence: 99%

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Stable and Passive High-Power Dual Active Bridge Converters Interfacing MVDC Grids

Freijedo

Rodriguez-Diaz

Dujić

2018

IEEE Trans. Ind. Electron.

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Abstract-Dual active bridge (DAB) is a topology that is receiving more and more attention as a potential solution to interface dc grids of different voltage levels. From a system level, the implications of DABs on the stability of complex power systems are addressed in this work. Dynamics modeling and stability assessment for a DAB implementation aimed to interface low-voltage energy resources with a medium-voltage dc (MVDC) collection and distribution grid are presented. The DAB admittance is analytically derived and assessed in order to describe its dynamics and anticipate its behavior when integrated in a complex MVDC grid. The model considers the low frequency range, mostly dominated by the controller action, and the high frequency range, described by a non-linear operation. The theoretical analysis is verified by hardware-in-the-loop emulation, with the controller running on a digital signal processor. The proposed implementation is proved to achieve passivity in the whole spectrum, which undoubtedly is a desired feature for a massive power electronics integration in the future MVDC grids.

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Section: Passivity Compliancementioning

confidence: 89%

Section: Digital Controller V2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Stable and Passive High-Power Dual Active Bridge Converters Interfacing MVDC Grids

Freijedo

Rodriguez-Diaz

Dujić

2018

IEEE Trans. Ind. Electron.

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Review and comparison of single and dual active bridge converters for MVDC-connected wind turbines

Timmers¹,

Egea-Àlvarez²,

Gkountaras³

et al. 2022

21st Wind &Amp; Solar Integration Workshop (WIW 2022)

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A key component for all-DC wind farms is the DC/DC converter. The converter must have multi-megawatt power capability, a high step-up ratio, provide galvanic isolation, and operate efficiently while being able to fit in the wind turbine nacelle. The single active bridge (SAB) and dual active bridge (DAB) converters in standalone or cascaded configuration are promising topologies that have the potential to meet these requirements. This paper reviews the operation and control of these converters, and compares their volume, weight, and efficiency for a 15 MW wind turbine with 80 kV DC connection. The results show that the standalone topologies are significantly smaller and lighter than their cascaded counterparts. However, all topologies fit inside the wind turbine nacelle. The SAB designs are the most efficient and robust, as they use diodes in the output bridge. The DAB topologies have the advantage of bidirectional power flow at the cost of additional switches and losses. The standalone DAB requires series-connected switches in the output bridge, which may difficult to implement. The cascaded topologies offer higher reliability without significantly increasing losses, making them the most attractive option for future DC wind turbines.

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Soft Switching Behavior of IGCT for Resonant Conversion

Stamenkovic

Vemulapati

Stiasny

et al. 2019

2019 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Application of the Integrated Gate Commutated Thyristor as a switching element in the medium voltage series resonant converter for DC-DC conversion offers the opportunity for increased conversion efficiency and higher switching frequency of the converter. Low current turn-off, already discussed in the previous works, shows promising results for increasing operating frequency of the converter, thus enabling the use of physically smaller components in the design, decreasing the total volume and weight of the solution. This paper presents the results of the switch characterization under single resonant current pulse operation, providing further insight into the turn-off process, relevant timing intervals and resulting losses, supported by TCAD simulations and experimental results.

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Selection of DC/DC converter for offshore wind farms with MVDC power collection

Cited by 11 publications

References 15 publications

Stable and Passive High-Power Dual Active Bridge Converters Interfacing MVDC Grids

Stable and Passive High-Power Dual Active Bridge Converters Interfacing MVDC Grids

Review and comparison of single and dual active bridge converters for MVDC-connected wind turbines

Soft Switching Behavior of IGCT for Resonant Conversion

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