A New Hybrid Dual Active Bridge Modular Multilevel Based DC–DC Converter for HVDC Networks

Ashraf, Mohamed; Nazih, Yousef; Alsokhiry, Fahad; Ahmed, Khaled; Abdel‐Khalik, Ayman S.; Al‐Turki, Yusuf

doi:10.1109/access.2021.3074543

Cited by 20 publications

(5 citation statements)

References 43 publications

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“…On the other hand, VSC-based systems provide independent control of active and reactive power in addition to easier reversal power flow capability. Furthermore, VSC-based HVDC systems are less efficient than LCC-based HVSC and have much higher cost due to large number of semiconductors [91]. The combination of both units can be a potential solution, combining the advantages of LCC-based and VSC-based HVDC technologies.…”

Section: A Hvdc Technologiesmentioning

confidence: 99%

Unlocking the Hidden Capacity of the Electrical Grid Through Smart Transformer and Smart Transmission

Liserre

Pérez²,

Langwasser³

et al. 2023

Proc. IEEE

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Power systems are experiencing a rapid and dramatic transformation driven by the massive integration of nondispatchable renewable energy sources such as wind and solar and highly variable loads such as electric vehicles and air conditioning. This challenges existing grid assets eventually leading to update them which in turn increase significantly the costs of the sustainable technologies. Power electronics is a pivotal technology for electrical power processing for renewable energies and sustainable transportation. By means of "smart" functionalities power electronics converters already embedded in such applications, can also contribute to guaranteeing the overall system stable operation. Anyway this cooperative contribution from distributed devices may be not enough leading to the need in the voltage transformation and power transmission of "system level" power electronics solutions. In the case of large charging stations a Smart Transformer while in the case of large solar and wind parks integration Medium or High Voltage Direct Current Transmission are system level solutions. This paper wants to review the potential of using such infrastructures to increase the capacity of existing grid assets avoiding or deferring their upgrade and hence reducing the overall costs of renewables integration and of the electrification of transport sector. In fact the power converters embedded in Smart Transformer (ST) and High Voltage Direct Current (HVDC) can provide fast frequency and voltage response and precise control of power flow acting at system level much more effectively and feasibly for system operators as the distributed power converters embedded in several small sources and users. This paper reviews for the first time these two key power electronics "system level" solutions together -Smart Transformer and High Voltage Direct Current -starting from their basic functionalities and showings how they can go beyond them showing how with grid forming functionalities they can offer new "Smart Grid" tools to enhance the capability of the existing electric grid infrastructures.

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Section: A Hvdc Technologiesmentioning

confidence: 99%

Unlocking the Hidden Capacity of the Electrical Grid Through Smart Transformer and Smart Transmission

Liserre

Pérez²,

Langwasser³

et al. 2023

Proc. IEEE

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Section: Dc-dc Convertersmentioning

confidence: 99%

“…A multilevel architecture allows for higher voltage gains for connections to distribution systems [27,149]. DAB MMCs can handle high power and DC voltage and have DC fault-blocking capability, with isolation benefits [150]. Energies 2021, 14, x FOR PEER REVIEW 19 of 37 bidirectional buck-boost topology is utilised to aid in regenerative braking.…”

Section: Dc-dc Convertersmentioning

confidence: 99%

“…A multilevel architecture allows for higher voltage gains for connections to distribution systems [27,149]. DAB MMCs can handle high power and DC voltage and have DC fault-blocking capability, with isolation benefits [150]. The non-isolated MMDC can be separated in two categories; the push-pull and the tuned filter topologies, shown in Figure 17, where SM represents the sub-module [151].…”

Section: Dc-dc Convertersmentioning

confidence: 99%

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Review of MVDC Applications, Technologies, and Future Prospects

Coffey

Timmers

et al. 2021

Energies

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This paper presents a complete review of MVDC applications and their required technologies. Four main MVDC applications were investigated: rail, shipboard systems, distribution grids, and offshore collection systems. For each application, the voltage and power levels, grid structures, converter topologies, and protection and control structure were reviewed. Case studies of the varying applications as well as the literature were analyzed to ascertain the common trends and to review suggested future topologies. For rail, ship, and distribution systems, the technology and ability to implement MVDC grids is available, and there are already a number of case studies. Offshore wind collection systems, however, are yet able to be implemented. Across the four applications, the MVDC voltages ranged from 5–50 kV DC and tens of MW, with some papers suggesting an upper limit of 100 kV DC and hundreds of MV for distribution networks and offshore wind farm applications. This enables the use of varying technologies at both the lower and high voltage ranges, giving flexibility in the choice of topology that is required required.

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“…Reference 11 discusses the interconnection of HVDC links with different grounding schemes. Reference 12 presents the case where DC/DC converter is used for the interconnection of LCC and VSC-based HVDC links. Besides working in normal operation, the fault-blocking capability and operation of DC/DC converters under DC faults have also been presented in some research studies 13,14,15 .…”

Section: Introductionmentioning

confidence: 99%

Small Signal Analysis of DC Voltage Control Based on a Virtual Resistance of DC/DC converter Integrated in a Multiterminal DC Grid

Shafique,

boukhenfouf,

Gruson

et al. 2023

Preprint

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<p>The future multi-terminal direct-current (MTDC) grid will require the interconnection of point-to-point highvoltage (HV) DC links with different specifications such as DC voltage level, system grounding configuration and HVDC technology. To adapt these differences, DC/DC converters are mandatory to interconnect HVDC links. Additionally, they are capable of providing supplementary functions as they are highly controllable devices. In this paper, a primary virtual resistance DC voltage controller associated with DC/DC converter is proposed for managing DC grid voltages of the interconnected HVDC grids, increasing the reliability of the system. The commonly known topology, Front-to-Front Modular Multilevel Converter (F2FMMC) is adopted for DC/DC converter. Time-domain simulation are performed using EMTP software for validating the controller behaviour under power disturbances and large event of loss of one converter in a MMC based MTDC system. All converters are modelled using reduced order modelling (ROM) methodology. Apart from this, dynamic studies have been carried out using linear state space model for small-signal stability analysis of a HVDC system integrating DC/DC converter with virtual resistance DC voltage controller. The </p>

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A New Hybrid Dual Active Bridge Modular Multilevel Based DC–DC Converter for HVDC Networks

Cited by 20 publications

References 43 publications

Unlocking the Hidden Capacity of the Electrical Grid Through Smart Transformer and Smart Transmission

Unlocking the Hidden Capacity of the Electrical Grid Through Smart Transformer and Smart Transmission

Review of MVDC Applications, Technologies, and Future Prospects

Small Signal Analysis of DC Voltage Control Based on a Virtual Resistance of DC/DC converter Integrated in a Multiterminal DC Grid

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