The role of coupling-frequency weighting exponent on synchronization of a power network

Through tropical cyclone (TC) activity the ocean and the atmosphere exchange a large amount of energy. In this work possible improvements introduced by a higher coupling frequency are tested between the two components of a climate model in the representation of TC intensity and TC–ocean feedbacks. The analysis is based on the new Centro Euro-Mediterraneo per I Cambiamenti Climatici Climate Model (CMCC-CM2-VHR), capable of representing realistic TCs up to category-5 storms. A significant role of the negative sea surface temperature (SST) feedback, leading to a weakening of the cyclone intensity, is made apparent by the improved representation of high-frequency coupled processes. The first part of this study demonstrates that a more realistic representation of strong TC count is obtained by coupling atmosphere and ocean components at hourly instead of daily frequency. Coherently, the positive bias of the annually averaged power dissipation index associated with TCs is reduced by one order of magnitude when coupling at the hourly frequency, compared to both forced mode and daily coupling frequency results. The second part of this work shows a case study (a modeled category-5 typhoon) analysis to verify the impact of a more realistic representation of the high-frequency coupling in representing the TC effect on the ocean; the theoretical subsurface warming induced by TCs is well represented when coupling the two components at the higher frequency. This work demonstrates that an increased horizontal resolution of model components is not sufficient to ensure a realistic representation of intense and fast-moving systems, such as tropical and extratropical cyclones, but a concurrent increase in coupling frequency is required.

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Fault-Tolerant Battery Power Network Architecture of Networked Swappable Battery Packs in Parallel

Energies ◽

10.3390/en14102841 ◽

2021 ◽

Vol 14 (10) ◽

pp. 2841

Author(s):

Chung-Jen Chou ◽

Shyh-Biau Jiang ◽

Tse-Liang Yeh ◽

Chein-Chung Sun

Keyword(s):

Energy Efficiency ◽

Direct Current ◽

Fault Tolerant ◽

Management Control ◽

Battery Pack ◽

Power Network ◽

Power Bus ◽

Battery Power ◽

Battery Packs

To improve the reliability and energy efficiency of battery swapping, we constructed a battery power network system with active redundancies and with multiple battery management controllers (one in each newly developed smart redundant battery pack). Each pack is getting ready to assume the role of the major to coordinate direct safe mounting of the packs onto the power bus for load sharing or charging without the need for a direct current to direct current converter. This fault-tolerant architecture provides multiple backups in both management control and power supply. To verify this design, the mounting, insertion, and removal of the battery packs were executed during charging and discharging. Battery packs can be swapped on and off safely at any time regardless of their charging states. Battery packs can be direct safe mounted onto the power bus by a threshold algorithm. With each mount on event, the equivalent output energy conversion efficiency ranges from 98.3% to 99.2% throughout the transient. Moreover, when the major battery pack fails or gets removed, other battery packs can indeed assume the role of major safely. The reliability, energy efficiency, and safety of our system were verified.

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The Role of Control Devices of Distribution Automation in the Intelligence of Power Network to Reduce Outages and Improve Reliability

Indian Journal of Science and Technology ◽

10.17485/ijst/2015/v8i35/61119 ◽

2015 ◽

Vol 8 (35) ◽

Author(s):

Abolfazl Ghanbarzadeh ◽

Khalil Banan Ali Abbasi

Keyword(s):

Distribution Automation ◽

Power Network ◽

Control Devices ◽

Improve Reliability

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Transformative and disruptive role of local direct current power networks in power and transportation sectors

Facta universitatis - series Electronics and Energetics ◽

10.2298/fuee1903387p ◽

2019 ◽

Vol 32 (3) ◽

pp. 387-402 ◽

Cited By ~ 4

Author(s):

Prahaladh Paniyil ◽

Rajendra Singh ◽

Amir Asif ◽

Vishwas Powar ◽

Guneet Bedi ◽

...

Keyword(s):

Direct Current ◽

Lithium Batteries ◽

Paradigm Shift ◽

Power Network ◽

Power Networks ◽

Power Sector ◽

Energy Poverty ◽

Dc Power ◽

Transportation Sector

The power sector is about to undergo a major disruptive transformation. In this paper, we have discussed the best possible energy solution for addressing the challenges of climate change and eradication of energy poverty. This paper focusses on the decentralized power generation, storage and distribution through photovoltaics and lithium batteries. It encompasses the need for local direct current (DC) power through the factors driving this change. The importance of local DC power in the transportation sector is also established. Finally, we conclude with data bolstering our argument towards the paradigm shift in the power network.

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