Power quality disturbances within DC data centers

Rajagopalan, S.; Fortenbery, B.; Symanski, D. P.

doi:10.1109/intlec.2010.5525723

Cited by 16 publications

(5 citation statements)

References 2 publications

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“…The main feature that must be maintained in a data center power system is high reliability [20][21][22]. Therefore, data centers are typically equipped with Uninterruptable Power Supplies (UPS), which require multiple conversion stages to connect the batteries to a DC bus.…”

Section: Data Centersmentioning

confidence: 99%

DC microgrids and distribution systems: An overview

Elsayed

Mohamed

Mohammed

2015

Electric Power Systems Research

509

211

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Section: Data Centersmentioning

confidence: 99%

DC microgrids and distribution systems: An overview

Elsayed

Mohamed

Mohammed

2015

Electric Power Systems Research

509

211

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“…One major limitation in current systems is the requirement of converting direct current (DC) power generated from the photovoltaic (PV) array into alternating current (AC) power which is then distributed to the facility and its electric loads. In several cases, this AC power is then converted back to DC to run certain devices resulting in approximately one third of the energy being wasted 1,2,3,4 . This is due to the conversion of DC to AC and then re-conversion of AC back to DC.…”

Section: Introductionmentioning

confidence: 99%

Reliability of hybrid photovoltaic DC micro-grid systems for emergency shelters and other applications

Dhere

Schleith

2014

SPIE Proceedings

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Improvement of energy efficiency in the SunSmart Schools Emergency Shelters requires new methods for optimizing the energy consumption within the shelters. One major limitation in current systems is the requirement of converting direct current (DC) power generated from the PV array into alternating current (AC) power which is distributed throughout the shelters. Oftentimes, this AC power is then converted back to DC to run certain appliances throughout the shelters resulting in a significant waste of energy due to DC to AC and then again AC to DC conversion. This paper seeks to extract the maximum value out of PV systems by directly powering essential load components within the shelters that already run on DC power without the use of an inverter and above all to make the system reliable and durable. Furthermore, additional DC applications such as LED lighting, televisions, computers and fans operated with DC brushless motors will be installed as replacements to traditional devices in order to improve efficiency and reduce energy consumption.Cost of energy storage technologies continue to decline as new technologies scale up and new incentives are put in place. This will provide a cost effective way to stabilize the energy generation of a PV system as well as to provide continuous energy during night hours. It is planned to develop a pilot program of an integrated system that can provide uninterrupted DC power to essential base load appliances (heating, cooling, lighting, etc.) at the Florida Solar Energy Center (FSEC) command center for disaster management. PV arrays are proposed to be installed on energy efficient test houses at FSEC as well as at private homes having PV arrays where the owners volunteer to participate in the program. It is also planned to monitor the performance of the PV arrays and functioning of the appliances with the aim to improve their reliability and durability. After a successful demonstration of the hybrid DC microgrid based emergency shelter together with the monitoring system, it is planned to replicate it at other schools in Florida and elsewhere to provide continuous power for essential applications, maximizing the value of PV generation systems

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“…They run efficiently and provide secure access to applications for users such as social network enterprises, government, financial institutions, news media, universities, etc. To operate without any interruptions, DCs require large amounts of premium power to ensure reliability [1], [2]. Thus, most DC installations have backup power generation systems (i.e., onsite generation and batteries) to provide redundancy when the main power supply fails.…”

Section: Introductionmentioning

confidence: 99%

An indirect matrix converter for CCHP microturbines in data center power systems

et al. 2012

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Data centers (DCs) are considered critical loads that require premium power from utilities to ensure reliability at all times. Microturbine (MT) generation systems are becoming important in DCs, not only as distributed generation (DG) for supplying electricity, but also for providing cooling and heating functions, which is known as combined cooling, heat and power (CCHP) or tri-generation. This paper considers the use of an indirect matrix converter (IMC) as the power electronic interface (PEI) to connect a permanent magnet synchronous generator (PMSG) with the power grid in a DC. First, the paper analyzes the semiconductor losses for the IMC and the conventional back-to-back converter (BBC) as a function of the switching frequency in order to determine the favorable operating conditions for the IMC. It then presents a new control strategy that does not require measuring the grid voltages to inject the commanded power into the grid at unity power factor. Simulation results of a 15-kVA, 480-Vrms IMC-based MT generation system show the effectiveness of the proposed control technique for this particular application.

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Power quality disturbances within DC data centers

Cited by 16 publications

References 2 publications

DC microgrids and distribution systems: An overview

DC microgrids and distribution systems: An overview

Reliability of hybrid photovoltaic DC micro-grid systems for emergency shelters and other applications

An indirect matrix converter for CCHP microturbines in data center power systems

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