HVDC power distribution systems for telecom sites and data centers

Fukui, Akiyoshi; Takeda, Takashi; Hirose, Keikichi; Yamasaki, Mikio

doi:10.1109/ipec.2010.5543344

Cited by 45 publications

(24 citation statements)

References 4 publications

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“…1.b) Resiliency against power quality issues: to protect the facility due to sudden power fluctuations, spikes, or surges, two elements are highly recommended: the secured power distribution unit (PDU) and high-voltage DC distribution (HVDC) [39], [40].…”

Section: A Resilient Facility Design and Operationmentioning

confidence: 99%

A Survey on Resiliency Techniques in Cloud Computing Infrastructures and Applications

Colman-Meixner

Develder

Tornatore

et al. 2016

IEEE Commun. Surv. Tutorials

130

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Abstract-Today's businesses increasingly rely on cloud computing, which brings both great opportunities and challenges. One of the critical challenges is resiliency: disruptions due to failures (either accidental or because of disasters or attacks) may entail significant revenue losses (e.g., US$ 25.5 billion in 2010 for North America). Such failures may originate at any of the major components in a cloud architecture (and propagate to others): (i) the servers hosting the application, (ii) the network interconnecting them (on different scales, inside a data center, up to wide-area connections), or (iii) the application itself. We comprehensively survey a large body of work focusing on resilience of cloud computing, in each (or a combination) of the server, network, and application components.First, we present the cloud computing architecture and its key concepts. We highlight both the infrastructure (servers, network) and application components. A key concept is virtualization of infrastructure (i.e., partitioning into logically separate units), and thus we detail the components in both physical and virtual layers. Before moving to the detailed resilience aspects, we provide a qualitative overview of the types of failures that may occur (from the perspective of the layered cloud architecture), and their consequences.The second major part of the paper introduces and categorizes a large number of techniques for cloud computing infrastructure resiliency. This ranges from designing and operating the facilities, servers, networks, to their integration and virtualization (e.g., also including resilience of the middleware infrastructure).The third part focuses on resilience in application design and development. We study how applications are designed, installed, and replicated to survive multiple physical failure scenarios as well as disaster failures.

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Section: A Resilient Facility Design and Operationmentioning

confidence: 99%

A Survey on Resiliency Techniques in Cloud Computing Infrastructures and Applications

Colman-Meixner

Develder

Tornatore

et al. 2016

IEEE Commun. Surv. Tutorials

130

View full text Add to dashboard Cite

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“…In the case that turn ratio of the transformer n is 1, the voltage gain M and the phase angle θ are calculated by following Eqs. (1), (2).…”

Section: Contactless DC Connector Based On Llc Resonant Dc-dc Convertmentioning

confidence: 99%

“…Energy saving in the data centers will contribute to solving some of our global environmental problems. Since 2008, the NTT (Nippon Telegraph and Telephone) Group has been developing 380-V DC distribution system that goes beyond the conventional 48 V DC distribution system to realize highly efficient and space-saving (high-power-density) power supply (2) (3) . Intensive studies have been carried out for high-powerdensity power electronics converter, and the output power density of the converter for 380-V DC distribution system is now at a level of 1 W/cm 3 .…”

Section: Introductionmentioning

confidence: 99%

Contactless DC Connector Concept for High-Power-Density 380-V DC Distribution System

2015

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A contactless DC connector concept has been proposed for next-generation 380-V DC distribution systems in data centers. An LLC resonant DC-DC converter topology with gallium nitride (GaN) power transistors has been applied to realize a highly efficient inductively coupled contactless connector. A prototype of a 1.2-kW 384 V-192 V contactless connector has been fabricated. An efficiency of over 95% and an ideal power density of over 5.0 W/cm 3 have been confirmed experimentally under 500-kHz operation. Design considerations for the proposed connector have been also conducted, and the approach for achieving a higher power density of 10 W/cm 3 has been presented. The proposed concept contributes to realizing a high-power-density DC distribution system because the functions for both the isolated DC-DC converter and conventional connector are integrated in a single instrument.

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“…Therefore, reliability is one of the most important indices that should be considered while designing data centers; especially considering the loss of electrical power caused by breakdowns. Under these conditions, it becomes necessary to develop a highly efficient DC-DC converter that would provide stable power distribution with high availability and reliability (8) . There is a need of a backup system that would ensure high reliability by maintaining a data center at the time of power interruption, especially during its peak hours of operation.…”

Section: Introductionmentioning

confidence: 99%

A DC Power Distribution System in a Data Center using a Triple Active Bridge DC-DC Converter

Masumoto

Wãda

et al. 2018

IEEJ Journal IA

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In recent years, the demand for high-reliability systems has been on the rise, while DC power distribution systems are widely used in data centers. The authors propose a DC power distribution system that uses a triple active bridge (TAB) DC-DC converter, toward the realization of such higher-reliability systems. The TAB converter is based on an isolated DC-DC converter and can control the DC power flow among the three ports. First, this paper presents a basic power flow control procedure of the TAB converter, using a phase-shift control. Further, two types of higher-reliability DC power distribution systems are proposed using the TAB converter. The experimental design and simulations of a prototype 200-V TAB converter with 500-W power, connected with the single and double loads, are reported. In the experiment, the 200-V TAB converter rated at a power of 500 W was constructed from a three-winding transformer and gallium nitride (GaN) power devices. Smooth output waveforms indicate good controllability of the power flow and good functional performance of the proposed DC power distribution system.

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HVDC power distribution systems for telecom sites and data centers

Cited by 45 publications

References 4 publications

A Survey on Resiliency Techniques in Cloud Computing Infrastructures and Applications

A Survey on Resiliency Techniques in Cloud Computing Infrastructures and Applications

Contactless DC Connector Concept for High-Power-Density 380-V DC Distribution System

A DC Power Distribution System in a Data Center using a Triple Active Bridge DC-DC Converter

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