Protection scheme for an LVDC distribution system

Salonen, Pasi; Nuutinen, Pasi; Peltoniemi, Pasi; Partanen, Jarmo

doi:10.1049/cp.2009.1053

Cited by 37 publications

(33 citation statements)

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“…Appropriate grounding for each system case is imperative to make it safe for people. In difficult grounding conditions, high earth voltages can appear in an LVDC system, leading to potential hazard for the public [13]. Hence grounding and protection configurations have to adapt to the characteristics of an LVDC system.…”

Section: Microgrid: Advantages and Disadvantagesmentioning

confidence: 99%

“…A challenge for existing converters, for example, is increasing their fault current capability [13].…”

Section: Microgrid: Advantages and Disadvantagesmentioning

confidence: 99%

“…• The lifetime of power electronic units is another issue, as it may even be a quarter of the lifetime of traditional AC components, so around 15-20 years, at least according to Salonen et al [13]. The short lifetime forces us to spend more on maintenance and replacement of these converters.…”

Section: Microgrid: Advantages and Disadvantagesmentioning

confidence: 99%

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Transient analysis of DC distribution grids

Petropoulos

Mackay

Ramírez-Elizondo

et al. 2017

2017 IEEE Second International Conference on DC Microgrids (ICDCM)

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The latest developments in power electronics along with the increased generation from Renewable Energy Sources (RES), the new prosumers who both generate and consume electricity and the rapid adoption of DC loads in the household are forcing us to rethink the manner with which power is distributed and consumed. The proposal to make DC technology an integral part of the distribution network seems to have more merit. This change would lead to energy savings in power conversion and enable the creation of meshed DC grids, highly controllable and flexible networks which will be able to facilitate the more sustainable energy future towards which we strive. To build such a system, however, a different approach than the one used in AC systems is needed, due to the peculiarities of DC technology. In our research for the best possible way to protect these systems, it is imperative to constantly test the protection circuit not only as a standalone, but also incorporate it in the systems that will be built and test them together. In other words, transient analysis of the systems with the proposed protection included is an integral part in gauging the impact of the latter on the former during operation, and therefore in assessing and improving the protection for this specific application.This thesis presents such a transient analysis of various configurations of DC distribution systems. A combination of theoretical and practical methods were used to investigate the behavior of the systems' variables after the occurrence of faults and current interruption. A number of networks of varying complexity were built with detailed cable models using the EMTP/ATP software package in order to simulate a multitude of faults and assess each network's response at various positions and most crucially, the effectiveness of the protection scheme in reducing the impact of the transients after the fault. The travel speed of the transients was also investigated. At the same time, a set of measurements was conducted on a DC street lighting network to study the transient behavior of a real system. A separate model was built to resemble the measured system, in order to compare between the simulations and the measurements. The evaluation of the measurement and simulation results led to conclusions that will contribute to the creation of better, safer and more versatile DC distribution grids. The comparison showed that the models used can approach the behavior of the real system to a reasonable degree. The other simulations indicated that the transient impact is significantly smaller in locations far from the fault, but continued operation of the healthy pole cannot be guaranteed, especially after earth faults. Dimitrios Petropoulos Delft, September 2016iii ACKNOWLEDGEMENTS

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Section: Microgrid: Advantages and Disadvantagesmentioning

confidence: 99%

“…A challenge for existing converters, for example, is increasing their fault current capability [13].…”

Section: Microgrid: Advantages and Disadvantagesmentioning

confidence: 99%

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Transient analysis of DC distribution grids

Petropoulos

Mackay

Ramírez-Elizondo

et al. 2017

2017 IEEE Second International Conference on DC Microgrids (ICDCM)

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“…According to [28] the earth isolated IT system offers the fastest touch voltage reduction during a fault compared to a TN system in cases where earth has a high resistivity. However, the IT system requires the use of insulating monitoring devices (IMDs) at the converter end to detect failure of the system insulation, which adds additional cost.…”

Section: Protection and Groundingmentioning

confidence: 99%

Feasibility of Direct Current Street Lighting & Integrated Electric Vehicle Charging Points

Smith¹,

Galloway²,

Emhemed³

et al. 2016

6th Hybrid and Electric Vehicles Conference (HEVC 2016)

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“…Therefore, ±750V is chosen to be the DC bus voltage for the Finnish LVDC test network to gain the highest power capacity for the same thermal limit [8,9]. In this paper, input DC voltage is chosen as 600V (±300V) to conform with the thermal and isolation limits of the existing cables.…”

Section: Introductionmentioning

confidence: 99%

MMC with Parallel-connected MOSFETs for LVDC Distribution Networks

Zhong

Roscoe

Holliday

et al. 2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

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A highly efficient DC-AC converter is key to the success of low-voltage DC (LVDC) distribution networks. Calculated power losses in a conventional IGBT 2-level converter, a SiC MOSFET 2-level converter, a Si MOSFET modular multilevel converter (MMC) and a GaN HEMT MMC are compared. Calculations suggest that the parallel-connected Si MOSFET MMC may be the most efficient topology for this LVDC application. In this paper, the current unbalance limits for the parallel-connected MOSFETs and the optimal number of parallel-connected MOSFETs for MMC are investigated. Experimental results are presented for current sharing in parallel-connected MOSFETs and for the verification of power loss in a single Si MMC module.

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Protection scheme for an LVDC distribution system

Cited by 37 publications

References 0 publications

Transient analysis of DC distribution grids

Transient analysis of DC distribution grids

Feasibility of Direct Current Street Lighting & Integrated Electric Vehicle Charging Points

MMC with Parallel-connected MOSFETs for LVDC Distribution Networks

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