scholarly journals Advances in Power and Energy Systems

TecnoLógicas ◽  
2018 ◽  
Vol 21 (42) ◽  
pp. 9-11
Author(s):  
Carlos A. Ramos-Paja ◽  
Daniel González-Montoya ◽  
Adriana Trejos-Grisales ◽  
Sergio I. Serna-Garcés
Keyword(s):  
Renewable Energy Sources ◽  
Life Time ◽  
Electrical Energy ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Electrical Systems ◽  
Research Fields ◽  
Power And Energy Systems ◽  
Power And Energy

Processing electrical energy is one of the most important research fields in our society. So far, tremendous efforts have been made to improve the efficiency of each step in electrical systems: generation systems have been enhanced by introducing renewable energy sources and new control systems for conventional generators, losses have been reduced, the power quality of distribution and transmission systems has been increased, the life-time and state-of-health of energy storage devices have been extended, and sections of the power grid have been isolated for intelligent energy management.

Energy and our future: a perspective from the Clemson Nanomaterials Center

2015 ◽  
Vol 4 (5) ◽  
Author(s):  
Apparao M. Rao
Keyword(s):  
Renewable Energy ◽  
Fossil Fuels ◽  
Renewable Energy Sources ◽  
Cost Effective ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Energy Demands ◽  
Working Together ◽  
Cost Effective Alternative ◽  
Power And Energy

AbstractOur increasing energy demands have spurred a rigorous search for renewable energy sources to reduce our dependence on fossil fuels. However, efficient use of renewable energy is possible only with advances in both energy generation and storage. Today’s batteries and capacitors, which are the main energy storage devices, cannot meet the world’s demand for combined power and energy densities. To enhance the viability of such energy storing devices, the Clemson Nanomaterials Center (CNC) has developed a mix of scalable processes for carbon nanotube-based hybrid electrodes that show promise as a cost-effective alternative to standard activated carbon-based electrodes. Working together with industrial partners, CNC has fabricated supercapacitors with energy and power densities in the range of ~11–35 Wh/kg and ~1.2–9 W/kg, respectively. Although this research development is transformative, further studies to optimize the separator and electrolyte technologies are needed to maximize both the energy and power density in a single device.

scholarly journals Fabrication and Characterization of Laser Scribed Supercapacitor Based on Polyimide for Energy Storage

2018 ◽  
Vol 778 ◽  
pp. 181-186 ◽  
Author(s):  
Tayyaba Malik ◽  
Shayan Naveed ◽  
Muhammad Muneer ◽  
Mohammad Ali Mohammad
Keyword(s):  
Energy Storage ◽  
Research Work ◽  
Electrical Energy ◽  
Energy Storage Devices ◽  
Super Capacitor ◽  
Storage Devices ◽  
Voltage Sweep ◽  
Tremendous Amount ◽  
The Stability

Recently, supercapacitors have attracted a tremendous amount of attention as energy-storage devices due to their high-power density, fast charge–discharge ability, excellent reversibility, and long cycling life. In this research work, we demonstrate a laser scribed super capacitor based on polyimide (PI) substrate for the storage of electrical energy. PI substrate of thickness 200μm and area 1cm × 1cm was reduced by a laser engraver with a 450 nm wavelength in the form of stackable supercapacitor electrodes. Although, PI itself exhibits non-conductive behavior; however, by laser irradiation we change the surface properties of PI and reduce its resistance. The chemical property of irradiated PI was characterized with XRD where the carbon peak was observed at 2*theta = 25.44, which confirms the reduction of PI material in to a graphene-like substance. The electrical conductivity was analyzed with a probe station and observed to be 1.6mS. Two conductive regions were assembled into a capacitor device by sandwiching a PVA/H3PO4 electrolyte in between. During the charging and discharging characterization of the capacitor device, current density was observed to be 1.5mA/cm2. Capacitance versus voltage analysis was carried out and the device showed 75mF/cm2 against a voltage sweep of ±2V. The galvanostatic charging and discharging curve shows a symmetric behavior with respect to time exhibiting the stability and durability of the device.

scholarly journals Evaluation of Functioning Quality of Local Electrical Systems by the Criterion Method Based on Markov Processes

2019 ◽  
pp. 169-172 ◽  
Author(s):  
Petro Lezhniuk ◽  
Vyacheslav Komar ◽  
Natalya Sobchuk ◽  
Olena Sikorska
Keyword(s):  
Markov Processes ◽  
Renewable Energy Sources ◽  
Network Development ◽  
Least Action ◽  
Electrical Systems ◽  
Principle Of Least Action ◽  
Intensive Development ◽  
Criterion Method ◽  
The Ideal

The article proposes to use of a combination of the criterion method and Markov processes to evaluate the quality of functioning of renewable energy sources (RES) in the form of integrated readiness characteristic of the electricity network with RES or a local electrical system (LES). This is possible throughthe analysis of the problems of ensuring the quality of electricity supply in the conditions of intensive development of RES and defined by the qualimetric characteristics of the electricity networks, which are important for the provision of quality electricity. This contribute the development of generalizedsolutions and network development strategies, especially when it comes to building RES. The components of the integral index are determined as the probability of matching the actual regime to the "ideal". The "ideal" mode is determined on the basis of the principle of least action and corresponds to the circuit diagram of the network formed by the r-scheme. The basis thus determined in this way reduces the subjectivity of both evaluations and decisions taken on the basis of it.

scholarly journals Designing Structural Electrochemical Energy Storage Systems: A Perspective on the Role of Device Chemistry

2022 ◽  
Vol 9 ◽  
Author(s):  
Adriana M. Navarro-Suárez ◽  
Milo S. P. Shaffer
Keyword(s):  
Energy Storage ◽  
Inorganic Compounds ◽  
Electrical Energy ◽  
Electrochemical Energy Storage ◽  
Storage Device ◽  
Composite Electrodes ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Electrochemical Energy

Structural energy storage devices (SESDs), designed to simultaneously store electrical energy and withstand mechanical loads, offer great potential to reduce the overall system weight in applications such as automotive, aircraft, spacecraft, marine and sports equipment. The greatest improvements will come from systems that implement true multifunctional materials as fully as possible. The realization of electrochemical SESDs therefore requires the identification and development of suitable multifunctional structural electrodes, separators, and electrolytes. Different strategies are available depending on the class of electrochemical energy storage device and the specific chemistries selected. Here, we review existing attempts to build SESDs around carbon fiber (CF) composite electrodes, including the use of both organic and inorganic compounds to increase electrochemical performance. We consider some of the key challenges and discuss the implications for the selection of device chemistries.

Analysis of Three Port Full Bridge and Half Bridge DC-DC Converter Interfacing Renewable Energy System

2013 ◽  
Vol 768 ◽  
pp. 3-8 ◽  
Author(s):  
M. Venmathi ◽  
R. Ramaprabha
Keyword(s):  
Renewable Energy ◽  
Power Flow ◽  
Pulse Width Modulation ◽  
Renewable Energy Sources ◽  
Energy System ◽  
Energy Sources ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Conversion Stage ◽  
Bidirectional Power Flow

This paper presents the comparative dynamic analysis of full bridge and half bridge three port dc-dc converter topology interfacing the renewable energy sources along with the energy storage devices. The three port converter comprises the active bridge circuit and the three winding transformer. It uses single power conversion stage with high frequency link to control power flow between the batteries, load and the renewable energy sources. The power flow between the ports is controlled by phase shifting the square wave outputs of the active bridges in combination with pulse width modulation (PWM) technique. The analysis reveals that the battery discharges when the source is not sufficient to supply the load and it was charged when the source alone is capable of supplying the load. Hence there is a bidirectional power flow in the storage port when there is a transition in the source.

scholarly journals Hydroquinone–pyrrole dyads with varied linkers

2016 ◽  
Vol 12 ◽  
pp. 89-96 ◽  
Author(s):  
Hao Huang ◽  
Christoffer Karlsson ◽  
Maria Strømme ◽  
Martin Sjödin ◽  
Adolf Gogoll
Keyword(s):  
Dft Calculations ◽  
Electrical Energy ◽  
Energy Storage Devices ◽  
Active Materials ◽  
Electrical Energy Storage ◽  
Storage Devices ◽  
H Nmr ◽  
Redox Active ◽  
Homo Lumo ◽  
C Nmr

A series of pyrroles functionalized in the 3-position with p-dimethoxybenzene via various linkers (CH2, CH2CH2, CH=CH, C≡C) has been synthesized. Their electronic properties have been deduced from 1H NMR, 13C NMR, and UV–vis spectra to detect possible interactions between the two aromatic subunits. The extent of conjugation between the subunits is largely controlled by the nature of the linker, with the largest conjugation found with the trans-ethene linker and the weakest with the aliphatic linkers. DFT calculations revealed substantial changes in the HOMO–LUMO gap that correlated with the extent of conjugation found experimentally. The results of this work are expected to open up for use of the investigated compounds as components of redox-active materials in sustainable, organic electrical energy storage devices.

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