Coordinated Control of Parallel DR-HVDC and MMC-HVDC Systems for Offshore Wind Energy Transmission

Li, Rui; Yu, Lujie; Xu, Lie; Adam, Grain Philip

doi:10.1109/jestpe.2019.2931197

Cited by 75 publications

(32 citation statements)

References 41 publications

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“…A co-operation system using both DR-HVDC and HVAC ( Figure 12) is proposed in [34]. In [35], a parallel system using MMC and DR, both with high capacities (Figure 13) is suggested.…”

Section: Variants Of Dr Architecturementioning

confidence: 99%

Review on DC transmission systems for integrating large‐scale offshore wind farms

Song

et al. 2021

Energy Conversion and Econom

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The exploitation of offshore wind power has increased rapidly in recent years. To gain more wind power energy, offshore wind farms move farther from onshore. A comparison between HVAC and HVDC in terms of reliability, cost and transmission capability shows that HVDC is more suitable for long-distance, high-capacity bulk power transmission. However, the HVDC transmission for offshore wind power also faces great challenges because the offshore applications bring critical demands for low volume and low weight for the converters at the offshore side. On the other hand, the new topologies and conversion techniques of power electronic converters expedite many new DC transmission architectures for offshore wind power. Different HVDC architectures by using centralised voltage source converter (VSC), diode rectifier (DR), series-connected wind turbine converters and all-DC wind farm based on DC transformers are reviewed and compared. The advantages, challenges and development and application prospects for various DC transmission solutions are discussed.

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“…A co-operation system using both DR-HVDC and HVAC ( Figure 12) is proposed in [34]. In [35], a parallel system using MMC and DR, both with high capacities (Figure 13) is suggested.…”

Section: Variants Of Dr Architecturementioning

confidence: 99%

Review on DC transmission systems for integrating large‐scale offshore wind farms

Song

et al. 2021

Energy Conversion and Econom

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“…The loss of the FB-MMC is thus derived as 1.08% [3,28,29,31]. Considering the DR loss of 0.5% [16,32] and the FB-MMC power rating of 0.15P0, the loss of the proposed DFB-MMC in nominal condition is calculated as 1.08%×0.15+0.5%×0.85=0.59%, being 26.6% lower than that of the conventional HB-MMC (i.e. 0.8%).…”

Section: Comparison Between the Proposed Dfb-mmc And Other Alternamentioning

confidence: 99%

“…However, the CHB converter needs to be rated over 30% of the power rating of the DR-HVDC link, leading to high capital cost. In [16], the DR and MMC are connected in parallel on AC sides to optimize the power flow distribution between these two HVDC links and improve availability of the parallel connected HVDC systems during faults. The MMC is connected in parallel with the DR on both AC and DC sides in [17] to energize the offshore AC grid and wind turbines during start-up and control the offshore frequency during normal operation.…”

Section: Introductionmentioning

confidence: 99%

A Unidirectional Hybrid HVDC Transmission System Based on Diode Rectifier and Full-Bridge MMC

2021

IEEE J. Emerg. Sel. Topics Power Electron.

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To reduce the cost of bulk power transmission using voltage source converter HVDC technology, a unidirectional hybrid converter is proposed, where a diode rectifier and a modular multilevel converter (MMC) based on full-bridge (FB) submodules are connected in series on DC side. The FB-MMC controls its DC voltage to regulate the transmitted power. The majority of the power transmission is via the diode rectifier considering its cost and efficiency superiority and only low power rating FB-MMC is required. A thyristor valve is equipped at the DC side of the FB-MMC to prevent potential overcharge of the FB submodules during DC faults. Compared to conventional MMCs, losses can potentially be reduced by around 20%. An active power controller is proposed to regulate the DC voltage of the FB-MMC so as to control the transmitted power. With the inverter station controlling its DC terminal voltage constant, the FB-MMC increases the output DC voltage to increase the transmitted power and, vice versa. To alleviate overvoltage of the HVDC link during AC grid faults of the inverter station, a dynamic DC voltage limiter is designed to actively reduce the DC output voltage of the FB-MMC. Simulation results confirm the proposed converter operation and control. Index Terms-active power control, diode rectifier HVDC (DR-HVDC), fault ride-through, HVDC transmission, full-bridge (FB) based modular multilevel converter (MMC).

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“…This leads to a large cost reduction as studied in [51] while in the meantime overcoming all the drawbacks of the DR-HVDC link. Then, a control of the parallel operation of the DR-HVDC and VSC-HVDC links for OWFs connection is proposed in [52]. The control system principles are based on the active power voltage (P-V) characteristics of the DR-HVDC link.…”

Section: Centralized Control Strategiesmentioning

confidence: 99%

Frequency Control of Offshore Wind Farms with Series-connected Diode Rectifier Units-based HVDC Connection

Nami

Amenedo

Arnaltes

et al. 2019

IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society

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Coordinated Control of Parallel DR-HVDC and MMC-HVDC Systems for Offshore Wind Energy Transmission

Abstract: His research interests include HVDC transmision system, grid integration of renewable power, power electronic converters, and energy conversion.

Cited by 75 publications

References 41 publications

Review on DC transmission systems for integrating large‐scale offshore wind farms

Review on DC transmission systems for integrating large‐scale offshore wind farms

A Unidirectional Hybrid HVDC Transmission System Based on Diode Rectifier and Full-Bridge MMC

Frequency Control of Offshore Wind Farms with Series-connected Diode Rectifier Units-based HVDC Connection

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