Experiences from use of an LVDC system in public electricity distribution

Nuutinen, Pasi; Kaipia, Tero; Peltoniemi, Pasi; Lana, Andrey; Pinomaa, Antti; Salonen, Pasi; Partanen, Jarmo; Lohjala, Juha; Matikainen, Mika

doi:10.1049/cp.2013.0919

Cited by 15 publications

(10 citation statements)

References 3 publications

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“…Efficiency is a key measure to achieve the EU 2020 targets; therefore LVDC distribution system will play a great role in improving efficiency. LVDC distribution system is more efficient than AC system [3] as the AC system is more prone to losses when it is used to distribute power within buildings due to the individual conversion stages of consumer electronics. The three targets defined by the EU as a benchmark to be achieved by 2020 are [4]:…”

Section: Low Voltage DC Distributionmentioning

confidence: 99%

A practical application of low voltage DC distribution network within buildings

Marah

Bhavanam

Taylor

et al. 2017

2017 52nd International Universities Power Engineering Conference (UPEC)

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The popularity of low voltage DC distribution system has increased in many countries such as the UK due to technological advances in power electronics. This is a promising feature for the future smart-grid distribution system because of its high efficiency and reliability. Hence some of the UK engineers are looking into the possibility of rolling out low voltage DC distribution in mainly commercial and residential buildings. However, the introduction of this technology presents some practical implementation challenges. This paper investigates the possibilities, benefits, and limitations of a low voltage DC distribution system within buildings.

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Section: Low Voltage DC Distributionmentioning

confidence: 99%

A practical application of low voltage DC distribution network within buildings

Marah

Bhavanam

Taylor

et al. 2017

2017 52nd International Universities Power Engineering Conference (UPEC)

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“…This is significantly important for rural networks which have long feeders and system efficiency can be an issue. The experience from a real rural LVDC test network as a part of Finnish national smart grids research program has concluded that LVDC is more efficient solution to rural ac networks when the feeders lengths are over 1 km [8]. LVDC has also the potential to enable increased power flow capacity for urban networks to supply higher load density.…”

Section: A Improving System Efficiency and Increasing Power Flow Capmentioning

confidence: 99%

An Advanced Protection Scheme for Enabling an LVDC Last Mile Distribution Network

Emhemed

Burt

2014

IEEE Trans. Smart Grid

159

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Low voltage direct current (LVDC) distribution systems have the potential to support future realization of smart grids and enabling of increased penetration of distributed renewables, electric vehicles, and heat pumps. They do, however, present significant protection challenges that existing schemes based on dc fuses and conventional electro-mechanical circuit breakers cannot manage due to the nature of dc faults and slow device performance. Therefore, this paper presents an advanced protection scheme that addresses the outstanding challenges for protecting an LVDC last mile distribution network. The scheme takes advantage of advanced local measurements and communications that will be naturally integrated in smart grids, and the excellent level of controllability of solid state circuit breakers. It thus provides fast dc fault detection and interruption during dc transient periods, in addition to achieving fault limitation and fast reliable restoration. The introductory part of the paper quantifies the potential benefits of LVDC last mile distribution networks, and discusses the potential LVDC architectures that best utilize the existing plant. Based on the new LVDC architectures, a typical U.K. LV network is energized using dc and modeled, and is used as a case study for investigating the protection issues and evaluating the new protection scheme performance through simulation.

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“…Previous studies on the LVDC distribution system have validated its performance and impact in industrial and commercial applications [12,13]. A variety of DC distribution schemes have been proposed [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Effective Three-Level Neutral Point Clamped Converter System for the Bipolar LVDC Distribution

Kim

Kim²,

Baek³

et al. 2019

Electronics

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Low-voltage direct current (LVDC) distribution has attracted attention due to increased DC loads, the popularization of electric vehicles, energy storage systems (ESS), and renewable energy sources such as photovoltaic (PV). This paper studies a ±750 V bipolar DC distribution system and applies a 3-level neutral-point clamped (NPC) AC/DC converter for LVDC distribution. However, the 3-level NPC converter is fundamental in the neutral-point (NP) imbalance problem. This paper discusses the NP balance control method using zero-sequence voltage among various solutions to solve NP imbalance. However, since the zero-sequence voltage for NP balance control is limited, the NP voltage cannot be controlled to be balanced when extreme load differences occur. To maintain microgrid stability with bipolar LVDC distribution, it is necessary to control the NP voltage balance, even in an imbalance of extreme load. In addition, due to the bipolar LVDC distribution, the pole where a short-circuit condition occurs limits the short current until the circuit breaker operates, and a pole without a short-circuit condition must supply a stable voltage. Since the conventional 3-level NPC AC/DC converter alone cannot satisfy both functions, an additional DC/DC converter is proposed, analyzed, and verified. This paper is about a 3-level NPC AC/DC converter system for LVDC distribution. It can be used for the imbalance and short-circuit condition in bipolar LVDC distribution through the prototype of the 300 kW 3-level NPC AC/DC converter system and experimented and verified in various conditions.

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Experiences from use of an LVDC system in public electricity distribution

Cited by 15 publications

References 3 publications

A practical application of low voltage DC distribution network within buildings

A practical application of low voltage DC distribution network within buildings

An Advanced Protection Scheme for Enabling an LVDC Last Mile Distribution Network

Analysis of Effective Three-Level Neutral Point Clamped Converter System for the Bipolar LVDC Distribution

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