Galvanic Isolation and Output LC Filter Design for the Low-Voltage DC Customer-End Inverter

Mattsson, Aleksi; Lana, Andrey; Nuutinen, Pasi; Väisänen, Vesa; Peltoniemi, Pasi; Kaipia, Tero; Silventoinen, Pertti; Partanen, Jarmo

doi:10.1109/tsg.2014.2316676

Cited by 13 publications

(5 citation statements)

References 15 publications

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“…Therefore, a galvanic isolation is required between the DC network and the functionally earthed (TN) customer-end network, which is a typical user-end earthing system in Finland. The galvanic isolation can be implemented either by using a 50 Hz transformer at the output of the CEI (1) or an isolating DC-DC converter at the input of the CEI (2) [10]. The first option, however, is not feasible because of the price and physical size of the 50 Hz transformer.…”

Section: Customer-end Inverter Topologiesmentioning

confidence: 99%

Power electronic losses of a customer-end inverter in low-voltage direct current distribution

Nuutinen

Mattsson

Kaipia

et al. 2014

2014 16th European Conference on Power Electronics and Applications

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A low-voltage direct current (LVDC) distribution system comprises a rectifier, a DC network, and customer-end inverters (CEI) responsible for the AC supply to the electricity end-users. The CEIs can be implemented as single-phase or three-phase ones; in this paper, feasible single-and three-phase topologies are introduced and their losses are calculated using nine different power switches. Three commercially available IGBT, MOSFET, and SiC MOSFET power switches are selected for comparison. In this application, a galvanic isolation between the DC network and the customer is required. The isolation is implemented by using an isolating DC/DC converter at the CEI supply, and therefore, the input voltage of the CEI can be different from the DC network voltage. In this paper, the effect of the supply voltage level on the losses of the CEI is calculated for the nine power transistors in single-and three-phase topologies.

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Section: Customer-end Inverter Topologiesmentioning

confidence: 99%

Power electronic losses of a customer-end inverter in low-voltage direct current distribution

Nuutinen

Mattsson

Kaipia

et al. 2014

2014 16th European Conference on Power Electronics and Applications

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“…Therefore the most important way to increase the efficiency of the LVDC distribution network in the future is to replace the traditional 50 Hz transformer with a DC/DC converter and a high-frequency isolation transformer. The power density of the DC/DC converter is 18 times higher compared to the 50 Hz transformer as discussed in [14].The amount of electric devices which produce or consume DC power, e.g. solar panels, electric vehicles, energy storages and consumer electronics are increased during the last few years.…”

Section: Efficiency Of Lvdc Distribution Network Supplied By One Convmentioning

confidence: 99%

“…Most of the efficiency analysis of the LVDC distribution network was done at a general level excluding verified converter and AC-filter loss analyses [11][12][13]. The detailed efficiency analysis of the bipolar LVDC distribution network with two-level converters is presented in [14].…”

Section: Introductionmentioning

confidence: 99%

Effect of network configuration and load profile on efficiency of LVDC distribution network

Rekola

Jokipii

Suntio

2014

2014 16th European Conference on Power Electronics and Applications

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The low voltage direct current (LVDC) distribution network is a promising solution to be considered in future smart grids. For facilitating the design of cost effective LVDC distribution networks, the total losses of the network with different configurations are evaluated and compared. The possibility to connect the customer loads asymmetrically, when the bipolar DC network is used and the fact that the customer has single-phase loads, which lead to phase-asymmetrical loading of a three-phase converter, are taken into account. According to the results presented in this paper, the highest efficiency is achieved when the ungrounded LVDC distribution network is supplied by two series connected line converters. When the length of the bipolar network is 600 m at maximum, three-phase load converters should be connected to 750 V DC with a 400V/400V isolation transformer. Instead, while the length of the DC network is over 600 m, the maximum efficiency is achieved when the unipolar network configuration is used by connecting the load converters to 1500 V DC with a 800V/400V isolation transformer.

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“…Additionally, high-frequency common-mode disturbances and earth currents, both during standard operation and under fault conditions, cannot be addressed considering the AC and DC parts separately, as was highlighted in [37][38][39][40]. Some papers propose to introduce metallic isolation by mean of specific converters [41,42], which usually helps to avoid unnecessary disturbances while allowing for correct earthing management. However, this approach exhibits two major drawbacks: on the one hand, it requires many earthing policies, in that each section of the distribution system is isolated from the others.…”

Section: Introductionmentioning

confidence: 99%

Fault-Tolerant Multiport Converter for Hybrid Distribution Systems: Configuration, Control Principles and Fault Analysis

Negri,

Ubezio,

Faranda

2024

Applied Sciences

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Multiport converters (MCs) are widely adopted in many applications, from renewable energy sources and storage integration to automotive applications and distribution systems. They are used in order to interface different energy sources, storage devices and loads with one single, simple converter topology in contrast to the traditional approach, which can require different solutions made by two-port converters. MCs allow for a reduction in the number of components and cascaded conversion stages with respect to an equivalent system of two-port converters, resulting in reduced complexity, dimensions and costs, as well as in improved reliability and enhanced efficiency. Nevertheless, some aspects related to the design of MCs are still worth further discussion when MCs are applied to hybrid AC/DC distribution systems. First, most converters are developed for one specific application and are not modular in structure. Furthermore, many of the proposed solutions are not equally suitable for AC and DC applications and they can introduce significant issues in hybrid distribution systems, with earthing management being particularly critical. Even though most available solutions offer satisfying steady-state and dynamic performances, fault behavior is often not considered and the possibility of maintaining controllability during faults is overlooked. Building on these three aspects, in this paper, a new MC for hybrid distribution systems is presented. An innovative circuit topology integrating three-phase AC ports and three-wire DC ports and characterized by a unique connection between the AC neutral wire and the DC midpoint neutral wire is presented. Its control principles and properties during external faults are highlighted, and extensive numerical simulations support the presented discussion.

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Galvanic Isolation and Output LC Filter Design for the Low-Voltage DC Customer-End Inverter

Cited by 13 publications

References 15 publications

Power electronic losses of a customer-end inverter in low-voltage direct current distribution

Power electronic losses of a customer-end inverter in low-voltage direct current distribution

Effect of network configuration and load profile on efficiency of LVDC distribution network

Fault-Tolerant Multiport Converter for Hybrid Distribution Systems: Configuration, Control Principles and Fault Analysis

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