High-Power Multilevel Step-Up DC/DC Converter for Offshore Wind Energy Systems

Gandomkar, Ali; Parastar, Amir; Seok, Jul-Ki

doi:10.1109/tie.2016.2594050

Cited by 33 publications

(28 citation statements)

References 32 publications

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“…In MV and HV DC girds, DC-MMC converters are frequently used to achieve the desired high step-up ratio. It can be an inventive solution from the AC-DC MMC with outstanding features including modularity, scalability up to high-voltage or high-power, LV stress on the power switches, and high level of reliability by using FBSMs [79], [80]. The DC-MMCs can be classified into two topologies which are tuned-filter and push-pull.…”

Section: DC Modular Multilevel Converters (Dc-mmc)mentioning

confidence: 99%

“…The power is transferred between the two AC and DC loops. The DC part is responsible for the power transfer among the DC ports, while the AC part is to achieve the required balance of stored energy in the SMs [79], [80], [82]. The DC current derived by the DC voltage component allows the bidirectional power flow while the AC component leads the AC circulating current to drive the exchange of real power between the arms to achieve capacitor voltage balance [80].…”

Section: DC Modular Multilevel Converters (Dc-mmc)mentioning

confidence: 99%

“…Although higher efficiency is achievable by some suitable regulation for the circulating current, MMCs are still limited to operate in a low or medium transformation ratio. That is because of the possibility of high losses that is appeared due to the AC current under high stepup transformation ratio [79].…”

Section: DC Modular Multilevel Converters (Dc-mmc)mentioning

confidence: 99%

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Isolated and Nonisolated DC-to-DC Converters for Medium-Voltage DC Networks: A Review

Alhurayyis¹,

Elkhateb²,

Morrow³

2021

IEEE J. Emerg. Sel. Topics Power Electron.

101

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MVDC technology is a promising solution to avoid installation of new AC networks. MVDC can provide optimum integration of large-scale renewable energy sources, the interconnection of different voltage levels of DC and AC grids with the ancillary services. The development in MVDC depends significantly on the DC-DC converters. Such converters support the modern trends of utilising medium-frequency transformers in power networks. Research on isolated converters technology is in its infancy and limited by the conversion ratio and component ratings. Besides, there is no standards exist covering specific aspects of isolated converter product. Thus, a review of such converters is needed. This work presents, for the first time, a review of the DC-DC power converter families in MVDC grids including the leading families which are isolated and nonisolated converters, as well as other subfamilies comparing the specifications and characteristics. Also, the applications of these converters are provided by focusing on the essential requirements for each application. Index Terms-MVDC grids, DC-DC power converters, dual active bridge (DAB), multilevel converter. TABLE I RECOMMENDED CLASSES FOR MVDC VOLTAGE MVDC Class (kV) Nominal Rated Voltage (kV) Maximum Rated Voltage (kV)

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Section: DC Modular Multilevel Converters (Dc-mmc)mentioning

confidence: 99%

Section: DC Modular Multilevel Converters (Dc-mmc)mentioning

confidence: 99%

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Isolated and Nonisolated DC-to-DC Converters for Medium-Voltage DC Networks: A Review

Alhurayyis¹,

Elkhateb²,

Morrow³

2021

IEEE J. Emerg. Sel. Topics Power Electron.

101

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“…ith the fast development of the high voltage DC (HVDC) technology based on voltage-source-converters (VSCs), offshore wind power will play an important role in the Europe electricity market in the near future [1][2][3]. To reduce the cost related to offshore wind power integration, the diode rectifier unit based HVDC (DRU-HVDC) has recently received notable interests [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Offshore AC Fault Protection of Diode Rectifier Unit-Based HVdc System for Wind Energy Transmission

2019

IEEE Trans. Ind. Electron.

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Offshore AC fault protection of wind turbines (WTs) connecting with diode rectifier unit based HVDC (DRU-HVDC) system is investigated in this paper. A voltage-error-dependent fault current injection is proposed to regulate the WT current during offshore AC fault transients and quickly provide fault current for fault detection. Considering different fault locations, the fault characteristics during symmetrical and asymmetrical faults are presented and the requirements for fault detection are addressed. A simple and effective offshore AC fault protection solution, combining both overcurrent protection and differential protection, is proposed by utilizing the developed fast fault current providing control. To improve system availability, reduced DC voltage of the DRU-HVDC system is investigated, where one of the series-connected DRUs is disconnected and the onshore modular multilevel converter (MMC) actively reduces DC voltage to resume wind power transmission. The proposed scheme is robust to various offshore AC faults and can automatically restore normal operation. Simulation results confirm the proposed fault protection strategy. Index Terms-diode rectifier unit based HVDC (DRU-HVDC), fault protection, HVDC transmission, offshore wind farm, symmetrical and asymmetrical AC faults.

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“…Each wind turbine is connected to the DC bus by an AC-DC-DC converter. As the terminal voltage of PMSG is usually low, high boost ratio is required [16]. The H-bridge DC-DC topology is commonly used to improve the efficiency of DC-DC converters [17].…”

Section: Introductionmentioning

confidence: 99%

HVDC Transmission Technology of Wind Power System with Multi-Phase PMSG

et al. 2018

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The high voltage DC (HVDC) transmission technology of wind power system, with multi-phase permanent magnetic synchronous generator (PMSG) is proposed in this paper. Each set of three-phase winding of the multi-phase PMSG was connected to a diode rectifier. The output of the diode rectifier was connected by several parallel isolated DC–DC converters. Each DC–DC converter was connected to a sub-module (SM). All SMs and two inductors were connected in a series. The proposed wind power system has several advantages including, transformerless operation, low cost, low voltage stress, and high fault tolerance. The maximum power point tracking (MPPT) and energy balance of the DC–DC converters were achieved by controlling the duty cycles of the DC–DC converters. The HVDC transmission was achieved by the nearest level control (NLC) with voltage sorting. The simulation model with 18-phase PMSG was established. Experimental results were also studied based on RT-Lab.

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High-Power Multilevel Step-Up DC/DC Converter for Offshore Wind Energy Systems

Cited by 33 publications

References 32 publications

Isolated and Nonisolated DC-to-DC Converters for Medium-Voltage DC Networks: A Review

Isolated and Nonisolated DC-to-DC Converters for Medium-Voltage DC Networks: A Review

Offshore AC Fault Protection of Diode Rectifier Unit-Based HVdc System for Wind Energy Transmission

HVDC Transmission Technology of Wind Power System with Multi-Phase PMSG

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