Lithium-Ion-Capacitor-Based Distributed UPS Architecture for Reactive Power Mitigation and Phase Balancing in Datacenters

Zhao, Shuze; Khan, Nameer; Nagarajan, Sundar; Trescases, Olivier

doi:10.1109/tpel.2018.2878682

Cited by 11 publications

(4 citation statements)

References 26 publications

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“…Regarding the energy efficiency of LICs, there are the following literature references. Reference [37] describes the efficiency of the LIC-based distributed uninterruptible power supply (UPS system. It shows that the experimental efficiency of the LIC with 3300 F is about 95% when the LIC module voltage changes from 6 to 7 V.…”

Section: Discussionmentioning

confidence: 99%

Investigation of Charging Efficiency of a Lithium-ion Capacitor during Galvanostatic Charging Method

Nakata

2019

Materials

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The charging efficiency of a lithium-ion capacitor (LIC) is an important problem. Until now, due to the stepwise charging method, the charging efficiency of 95.5% has been realized. However, the problem is that the issue of what level the charging efficiency can be increased to, is yet to be well investigated. In this article, the problem is investigated under the galvanostatic charging condition. The charging efficiency is measured as a function of the charging current. As a result, it can be more than 99.5% when the charging is quasi-static, in other words, an adiabatic process is realized. Next, the problem of how much energy can be taken out from the energy-stored capacitor is investigated with a load resistor circuit. It is clarified that the discharging energy from the capacitor is equal to the stored energy in the case when a load resistor is used and the discharging is quasi-static. It is confirmed that LICs are suitable for use as energy storage devices.

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Section: Discussionmentioning

confidence: 99%

Investigation of Charging Efficiency of a Lithium-ion Capacitor during Galvanostatic Charging Method

Nakata

2019

Materials

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“…The primary objective of this topology is to suppress the harmonics of the input current (Jou and Wu, 1995). However, a negligible amount of reactive power compensation will be required (Nakata, 2019;Zhao et al, 2019). The addition of a triport transformer between the load and utility for isolation increases the size of the system.…”

Section: Survey On Uninterruptable Power Supplymentioning

confidence: 99%

Analysis, monitoring, and mitigation of power quality disturbances in a distributed generation system

Ravi

Kumar

2022

Front. Energy Res.

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Despite the numerous benefits of distributed generation (DG), such as reliable energy supply and environmental friendliness, there are a number of challenges associated with integrating DG with the grid. In the field of DG, the complication of power quality (PQ) is a major technical challenge. Custom power devices (CPDs) are used in the distribution system to solve complications. This study presents different PQ disturbances (PQDs), monitoring techniques, and fundamental standards. Furthermore, with the widespread literature, the study critically reviews different PQ mitigation techniques such as distribution static compensator (DSTATCOM), dynamic voltage restorer (DVR), unified power quality conditioner (UPQC), and uninterruptable power supply (UPS). The present research work is not only limited to surveying the existing techniques but also analyzing the performance of UPQC using the ANFIS controller. Overall, this study is intended to provide researchers working on improving PQ in the distribution system with a valuable resource that will aid them in enriching their research.

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“…Most existing research on the aforementioned issue focuses on reducing the power consumption rather than carbon emission of data centers (Yu et al, 2014), which tried three main ways to reduce the energy consumption in the data centers. The first is to boost the power conversion efficiency of data center power supply system by improving the efficiency of power converters, such as power supply unit (PSU) or uninterruptible power supply (UPS) (Ahmed et al, 2017;Zhao et al, 2019). The second is to jointly optimize the computational workload scheduling with the micro grid operations in data centers, or optimize the planning of data center micro grid (Li et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Joint optimization of operational cost and carbon emission in multiple data center micro-grids

Hao,

Liu,

Deng

2024

Front. Energy Res.

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As the internet data centers are mushrooming, the energy consumption and carbon emission of data centers are increasing rapidly. To cut down the electricity cost and carbon emission of the data centers, we proposed an optimization method to reduce the electricity cost and carbon emission in geo-distributed multiple data centers. In the proposed method, the carbon tax is considered in the overall operation cost to optimize the carbon emission. The spatial and temporal flexibility of computational workload is fully utilized by considering the difference in renewable energy power output, local electricity and carbon emission of multiple geo-distributed data centers to achieve a better performance. Furthermore, the nonlinear characteristics of the power loss of uninterruptible power supply (UPS) are considered in the optimization. To verify the proposed optimization method, simulation of six cases is carried out with realistic data, and results have proved the proposed method can reduce the operational costs by 4.93%–12.7% and decrease carbon emissions by up to 10%.

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Lithium-Ion-Capacitor-Based Distributed UPS Architecture for Reactive Power Mitigation and Phase Balancing in Datacenters

Cited by 11 publications

References 26 publications

Investigation of Charging Efficiency of a Lithium-ion Capacitor during Galvanostatic Charging Method

Investigation of Charging Efficiency of a Lithium-ion Capacitor during Galvanostatic Charging Method

Analysis, monitoring, and mitigation of power quality disturbances in a distributed generation system

Joint optimization of operational cost and carbon emission in multiple data center micro-grids

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