A partially rated DC-DC converter for power flow control in meshed LVDC distribution grids

Purgat, Pavel; Prakoso, Ryan Adilardi; Mackay, Laurens; Qin, Zian; Ramírez-Elizondo, Laura; Bauer, Pavol

doi:10.1109/apec.2018.8341229

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…, due to its simple topology and control, galvanic isolation, bidirectional power flow, wide input and output voltage adaptive range, high power density, and efficiency, is very promising in applications like Solid State Transformers (SST) [2][3][4], electric vehicle chargers with V2G concept [5] [6], power flow control in DC grids [7][8][9], etc.…”

Section: Introduction He Dab Convertermentioning

confidence: 99%

Transformer Current Ringing in Dual Active Bridge Converters

Qin

Shen

Blaabjerg

et al. 2021

IEEE Trans. Ind. Electron.

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Section: Introduction He Dab Convertermentioning

confidence: 99%

Transformer Current Ringing in Dual Active Bridge Converters

Qin

Shen

Blaabjerg

et al. 2021

IEEE Trans. Ind. Electron.

Self Cite

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“…In particular, due to the fact that the required percentage of voltage regulation is not usually higher than ±20% of the nominal voltage, the proposed approach only uses the 20% of the original converter ratings. According to [30], one of the main drawbacks of using converters rated for the full power rating of the grid is their high losses for switching and conduction as well as their high maintenance costs. Although losses and costs analysis are out of the scope of this paper, it is expected that since it handles only the 20% of the total power, the losses and the costs of the proposed approach would be reduced with respect to the ones associated with the use of full rated converters.…”

Section: Introductionmentioning

confidence: 99%

Control Configurations for Reactive Power Compensation at the Secondary Side of the Low Voltage Substation by Using Hybrid Transformer

et al. 2021

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The high penetration of new device technologies, such as Electric Vehicles (EV), and Distributed Generation (DG) in Distribution Networks (DNs) has risen new consumption requirements. In this context, it becomes crucial to implement a flexible, functional and fast responsive management of the voltage level and Reactive Power (RP) in the DN. The latest improvements in the Solid State Switches (SSS) field demonstrate they can be used as a Power Electronic (PE) converter. In particular, they have been shown to be capable of operating synchronously with transformers, making the Hybrid Distribution Transformer (HT) concept a potential and cost-effective solution to various DN control issues. In this paper, a HT-based approach consisting of augmenting the conventional Low Voltage (LV) transformer with a fractionally rated PE converter for regulating and controlling the RP in the last mile of the DN is proposed. In this way, it is expected to meet the demand of the future DN from an efficiency, controllability and volume perspective. The proposed approach is implemented using a back-to-back converter. In addition, a power transfer control topology is used to implement the proposed control of the RP injection that controls the voltage level at the Direct Current (DC) link. The proposed approach has been demonstrated in different load scenarios using the Piecewise Linear Electrical Circuit Simulation (PLECS) tool. The simulation results show that the proposed approach can compensate the loads with their need from RP instead of feeding them from the transmission grid at the primary side of the Distribution Transformer (DT). In this way, the proposed approach is able to decrease the transferred amount of RP in the transmission lines.

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“…However, despite the advances in the power electronics the cost and losses remain a bottleneck. Similar solutions using partially rated power flow control converters (PFCC) were independently proposed for high voltage dc and lvdc [25], [30], [31], [32]. The PFCC reduces losses from the system perspective with processing only a fraction of the power that it is controlling.…”

mentioning

confidence: 99%

Partially Rated Power Flow Control Converter Modeling for Low-Voltage DC Grids

Purgat

Blij

Qin

et al. 2020

IEEE J. Emerg. Sel. Topics Power Electron.

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Scalable and robust low voltage direct current distribution (lvdc) networks require solutions allowing flexible power flow control and reliable short-circuit protection. In this paper, the continuous full-order large and small signal models of a partially rated power flow control converter (PFCC) are derived utilizing the generalized averaging method. The large signal model of the PFCC is coupled with a model of the lvdc grid. Due to the state-space representation the combined model of the PFCC and the lvdc grid is suitable for easy algorithmization, and efficient simulation. These advantages make them essential tools for studying and optimizing of scalable lvdc systems with decentralized power flow control based on the PFCC. The PFCC models provide insights into controller design and stability analysis. The models are experimentally validated, and the functionality of the PFCC is demonstrated in a laboratoryscale microgrid.

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A partially rated DC-DC converter for power flow control in meshed LVDC distribution grids

Cited by 9 publications

References 8 publications

Transformer Current Ringing in Dual Active Bridge Converters

Transformer Current Ringing in Dual Active Bridge Converters

Control Configurations for Reactive Power Compensation at the Secondary Side of the Low Voltage Substation by Using Hybrid Transformer

Partially Rated Power Flow Control Converter Modeling for Low-Voltage DC Grids

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