Direct Current Transformer Impact on the DC Power Distribution Networks

Barcelos, Renan Pillon; Dujić, Dražen

doi:10.1109/tsg.2022.3162310

Cited by 6 publications

(5 citation statements)

References 34 publications

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“…Therefore, more power can be exchanged between AC and DC networks, allowing for a broader range of operations than when only a single IC can control the DC voltage. 3) When DC/DC transformers are present, the DC grid can have multiple voltage levels, which leads to a more optimal control of the entire grid [21]. The hybrid AC/DC grid used for the validation of our proposed LF method is a real grid available at the EPFL campus that has multiple DC/DC transformers and is inspired by a real microgrid benchmark.…”

Section: State-of-the-art Reviewmentioning

confidence: 99%

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General and Unified Model of the Power Flow Problem in Multiterminal AC/DC Networks

Lambrichts,

Paolone

2024

IEEE Trans. Power Syst.

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This paper proposes a generic and unified model of the power flow (PF) problem for multiterminal hybrid AC/DC networks. The proposed model is an extension of the standard AC-PF. The DC network is treated as an AC one and, in addition to the Slack, PV and PQ nodes, four new node types are introduced to model the DC buses and the buses connecting the AC/DC interfacing converters (IC). The unified model is solved using the Newton-Raphson method. The extended PF equations can be used in the presence of multiple ICs operating under different control modes. Compared to other recent works, the proposed method allows multiple ICs to regulate the DC voltage simultaneously. This corresponds to more realistic operational conditions that ensure redundancy and allow for more flexible control of the hybrid grid. The proposed model can be used for networks under unbalanced conditions and allows for an intentionally negative sequence power injection. In addition to the operational advantages of this method, it is shown that the computational performance of the proposed method is one order of magnitude better than that of other methods presented in the existing recent literature while having the same accuracy.2 We use the standard PF nomenclature where in a PV node the active power and the voltage magnitude are controlled and in a PQ node the active and reactive power are controlled

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Section: State-of-the-art Reviewmentioning

confidence: 99%

“…2. The conduction losses are modelled as a voltage source E c l on the AC side ( 20) and the switching losses as a DC current source I sw k (21).…”

Section: Ac/dc Interfacing Converter Loss Modelmentioning

confidence: 99%

General and Unified Model of the Power Flow Problem in Multiterminal AC/DC Networks

Lambrichts,

Paolone

2024

IEEE Trans. Power Syst.

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“…Indeed, inserting a DCT between DC lines connected to AFEs introduces an additional element that naturally has an impact on the system dynamics and overall performance. Interaction between AFEs and DCTs has been investigated in two different aspects: the power flow control coordination between DCTs and AFEs [4,17] (for optimal utilization of the DCT) and the stability issue [18]. It is also important to address this interaction from a dynamics perspective, as a fast response leads to better power flow control.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, in distribution systems, as converters can be distributed over long distances, DC transformers could be located far away from an AFE, and dynamics for remote or close DCT must be assessed, similarly to the approach taken by [18] to evaluate the stability.…”

Section: Introductionmentioning

confidence: 99%

“…as done in [4] to investigate the DCT design) or as a voltage source (e.g. as done in [18] to investigate the impact of the DCT on the system stability, when AFEs are regulating the voltage). Indeed, inserting a DCT between DC lines connected to AFEs introduces an additional element that naturally has an impact on the system dynamics and overall performance.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics analysis for DC transformers integration in hybrid AC‐DC power distribution networks

Mace

Barcelos

Dupont

et al. 2023

IET Power Electronics

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In AC/DC power distributions networks, power converters are interfacing buses to ensure DC voltage regulation and power distribution. Active front ends are used between AC and DC buses and two typical control schemes that can be implemented are voltage regulation or power regulation. On the DC side, open‐loop operated DC transformers could be used between two DC buses to provide voltage adaptation, isolation and natural power flow. In this context, power flows and DC bus voltages in the power distribution network are dependent on the combined operation of the active front ends and the DC transformer. Mainly studied from a stability perspective, this interdependency between active front ends and DC transformers has lacked investigations in terms of dynamics. Fast dynamics is nevertheless important to operate optimally a network. In this paper, the assessment of the dynamic performance for distribution systems with DC transformers is performed for different mixes of voltage regulating and power regulating active front ends. The influence of DC line length and DC transformer power reversal method on the system is further investigated. A model of the system is proposed, validated experimentally and can be used to aid system level design and analysis of future DC systems.

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Graph attention-based U-net conditional generative adversarial networks for the identification of synchronous generation unit parameters

Yin,

Zhao

2023

Engineering Applications of Artificial Intelligence

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Direct Current Transformer Impact on the DC Power Distribution Networks

Cited by 6 publications

References 34 publications

General and Unified Model of the Power Flow Problem in Multiterminal AC/DC Networks

General and Unified Model of the Power Flow Problem in Multiterminal AC/DC Networks

Dynamics analysis for DC transformers integration in hybrid AC‐DC power distribution networks

Graph attention-based U-net conditional generative adversarial networks for the identification of synchronous generation unit parameters

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