Technical and Economical Evaluation of DC High-Temperature Superconductor Solutions for the Grid Connection of Offshore Wind Parks

Morandi, Antonio; Gholizad, Babak; Stieneker, Marco; Stagge, Hanno; Doncker, Rik W. De

doi:10.1109/tasc.2016.2591832

Cited by 13 publications

(7 citation statements)

References 10 publications

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“…As for the inverters, the values shown in Figure 5 are obtained by in-field measurement of the input and output power (source ENGIE Eps internal document). The efficiency of the dcdc converter shown in Figure 7 is given by [41,42]. As for the transformer, a constant efficiency 𝜂𝜂 𝑇𝑇 , independent on the power, is assumed.…”

Section: 𝜂𝜂 =mentioning

confidence: 99%

Efficiency Comparison of DC and AC Coupling Solutions for Large-Scale PV+BESS Power Plants

Franco

Morandi

Raboni³

et al. 2021

Energies

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In large-scale photovoltaic (PV) power plants, the integration of a battery energy storage system (BESS) permits a more flexible operation, allowing the plant to support grid stability. In hybrid PV+BESS plants, the storage system can be integrated by using different power conversion system (PCS) layouts and different charge–discharge strategies. In the AC-coupling layout, the BESS is connected to the ac-side of the system through an additional inverter. In the DC-coupling layout, the BESS is connected to the dc-side, with or without a dedicated dc–dc converter, and no additional inverter is needed. Referring to a 288 MWp PV plant with a 275 MWh BESS, this paper compares the PCS efficiency between AC- and DC-coupling solutions. The power injected into the grid is obtained considering providing primary power-frequency regulation services. A charging and discharging strategy of the BESS is proposed to ensure cyclic battery energy shifting. The power flows in the different components of the system that are obtained under realistic operating conditions, and total energy losses and annual average efficiency are calculated accordingly. Finally, results show a higher efficiency of DC-coupling compared to the AC-coupling layout.

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Section: 𝜂𝜂 =mentioning

confidence: 99%

Efficiency Comparison of DC and AC Coupling Solutions for Large-Scale PV+BESS Power Plants

Franco

Morandi

Raboni³

et al. 2021

Energies

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“…Due to the presence of L f ω g terms in (6) and 7, dynamics of dq-current (i gd ; i gq ) are coupled. The modulation signal is defined by (10) and (11) to decouple the dynamics.…”

Section: Converter Controller Of Type-4 Pmsg Wind Turbine Generatormentioning

confidence: 99%

“…It can be seen in (12) and (13) that the output dq-axis components (i gdq ) of grid current can be controlled by u gd and u gq . The proportional-integral (PI) regulators are used to generate the control signals u d and u q as follows (14) and (15) in (10) and (11), respectively, we have…”

Section: Converter Controller Of Type-4 Pmsg Wind Turbine Generatormentioning

confidence: 99%

“…The use of a medium voltage HTS cable for the grid connection of offshore wind farms could reduce a considerable power transfer loss [10]. The technical and economic evaluation of an HTS cable solution for the wind farm in [11] showed that the use of ±150 kV DC HTS transmission is a cost-competitive solution. In addition, using the medium voltage AC HTS cable for wind power transfer would reduce the capital cost of offshore wind farms due to the lack of high-power transformers and AC/DC converter systems.…”

Section: Introductionmentioning

confidence: 99%

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Impacts of a LVRT Control Strategy of Offshore Wind Farms on the HTS Power Cable

2020

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High temperature superconducting (HTS) power cables are a potential solution for the grid integration of offshore wind farms since the HTS cable can conduct bulk wind power at low voltage levels. However, the transient current through the HTS cable in cases of low voltage ride through (LVRT) operation has a negative impact on the HTS cable operation due to the quenching phenomenon. This paper analyzes the impact of LVRT control strategies on the HTS cable operation. In addition, a coordinated control of wind turbines for LVRT improvement of an offshore wind farm is proposed. The feasibility of the HTS cable application for the grid connection of offshore wind farms is also discussed in this study. The proposed controller is designed for the wind turbine generator based on a type-4 permanent magnet synchronous generator. In the proposed controller, the transient current through the HTS cable is reduced by regulating the machine side power during fault conditions. The feasibility of the proposed controller is validated in the PSCAD/EMTDC program (Manitoba Hydro International Ltd., Winnipeg, Manitoba, Canada, version 4.2.1). The effects of transient current on the cable temperatures and resistances are analyzed in this study. Simulation results show that the proposed control strategy could reduce the transient current and temperature rise of the HTS cable.

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“…However, this model is not generic and cannot be applied to HTS DC cables with other design configurations. Reference [16] This is a peer-reviewed, accepted author manuscript of the following article: Xiang, W., Yuan, W., Xu, L., Hodge, E., Fitzgerald, J., McKeever, P., & Bell, K. (2021). DC fault study of a point-to-point HVDC system integrating offshore wind farm using high-temperature superconductor DC cables.…”

Section: Introductionmentioning

confidence: 99%

DC Fault Study of a Point-to-Point HVDC System Integrating Offshore Wind Farm Using High-Temperature Superconductor DC Cables

Xiang

Yuan

et al. 2022

IEEE Trans. Energy Convers.

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This paper presents a feasibility study of an offshore wind farm (OWF) HVDC integration system using hightemperature superconductor (HTS) DC cables. A representative ±100kV/2GW point-to-point OWF HVDC system is proposed including HTS DC cables and two converter stations using modular multilevel converters (MMCs). To be compatible with the high current rating of the HTS cables, each of the offshore and onshore converter stations consists of three MMCs in parallel. To study the interaction between HTS DC cables and MMCs, a multiple lumped π-section model of a HTS DC cable considering electrical and thermal functionality is developed. This paper provides a critical assessment of the proposed HVDC-HTS system, with emphasis on the performance under fast DC fault transients. Detailed simulations presented in this paper reveal that the HVDC-HTS system provides effective current limiting against DC cable short circuit faults.

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Technical and Economical Evaluation of DC High-Temperature Superconductor Solutions for the Grid Connection of Offshore Wind Parks

Cited by 13 publications

References 10 publications

Efficiency Comparison of DC and AC Coupling Solutions for Large-Scale PV+BESS Power Plants

Efficiency Comparison of DC and AC Coupling Solutions for Large-Scale PV+BESS Power Plants

Impacts of a LVRT Control Strategy of Offshore Wind Farms on the HTS Power Cable

DC Fault Study of a Point-to-Point HVDC System Integrating Offshore Wind Farm Using High-Temperature Superconductor DC Cables

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