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Articles 91 - 114 of 114
Full-Text Articles in Science and Technology Studies
Comparative Analysis Of Dynamic Line Rating Models And Feasibility To Minimise Energy Losses In Wind Rich Power Networks, Mathew Simms, Lasantha Meegahapola
Comparative Analysis Of Dynamic Line Rating Models And Feasibility To Minimise Energy Losses In Wind Rich Power Networks, Mathew Simms, Lasantha Meegahapola
Faculty of Engineering and Information Sciences - Papers: Part A
Wind power generation has indicated an exponential increase during last two decades and existing transmission network infrastructure is increasingly becoming inadequate to transmit remotely generated wind power to load centres in the network. The dynamic line rating (DLR) is one of the viable solutions to improve the transmission line ampacity during high wind penetration without investing on an additional transmission network. The main objective of this study is to identify the basic differences between two main line rating standards, since transmission network service providers (TNSPs) heavily depend on these two standards when developing their line rating models. Therefore, a parameter …
Asset Management In The Energy Pipeline Industry In Australia, Richard Dwight, Tieling Zhang, Khaled O. El-Akruti
Asset Management In The Energy Pipeline Industry In Australia, Richard Dwight, Tieling Zhang, Khaled O. El-Akruti
Faculty of Engineering and Information Sciences - Papers: Part A
A review of asset management systems within the context of energy pipelines has been conducted. It covers available methodologies, current asset management systems, opportunities for improvement and research challenges. A particular point of interest is the degree to which consideration of remaining life and the influence of maintenance activities are used to drive the asset management strategy. Asset management within the energy pipeline industry is mostly concerned with integrity assurance. Irrespective of this overriding goal, cost of delivery is also of concern. At any point of the service life the remaining life of the pipeline at an acceptable level of …
Mitigation Of Rooftop Solar Pv Impacts And Evening Peak Support By Managing Available Capacity Of Distributed Energy Storage Systems, Md Jan-E- Alam, Kashem Muttaqi, Darmawan Soetanto
Mitigation Of Rooftop Solar Pv Impacts And Evening Peak Support By Managing Available Capacity Of Distributed Energy Storage Systems, Md Jan-E- Alam, Kashem Muttaqi, Darmawan Soetanto
Faculty of Engineering and Information Sciences - Papers: Part A
A high penetration of rooftop solar photovoltaic (PV) resources into low-voltage (LV) distribution networks creates reverse power-flow and voltage-rise problems. This generally occurs when the generation from PV resources substantially exceeds the load demand during high insolation period. This paper has investigated the solar PV impacts and developed a mitigation strategy by an effective use of distributed energy storage systems integrated with solar PV units in LV networks. The storage is used to consume surplus solar PV power locally during PV peak, and the stored energy is utilized in the evening for the peak-load support. A charging/discharging control strategy is …
Adaptive Stochastic Energy Flow Balancing In Smart Grid, Hassan Shirzeh, Fazel Naghdy, Philip Ciufo, Montserrat Ros
Adaptive Stochastic Energy Flow Balancing In Smart Grid, Hassan Shirzeh, Fazel Naghdy, Philip Ciufo, Montserrat Ros
Faculty of Engineering and Information Sciences - Papers: Part A
A smart grid can be considered as an unstructured network of distributed interacting nodes represented by renewable energy sources, storage and loads. The nodes emerge or disappear in a stochastic manner due to the intermittent nature of natural sources such as wind speed and solar irradiation. Prediction and stochastic modelling of electrical energy flow is a critical characteristic in such a network to achieve load balancing and/or peak shaving in order to minimise the fluctuation between off peak and peak demand by power consumers. Before contributing energy to the network, a node acquires information about other nodes in the grid …
Energy-Aware Two Link-Disjoint Paths Routing, Gongqi Lin, Sieteng Soh, Mihai Lazarescu, Kwan-Wu Chin
Energy-Aware Two Link-Disjoint Paths Routing, Gongqi Lin, Sieteng Soh, Mihai Lazarescu, Kwan-Wu Chin
Faculty of Engineering and Information Sciences - Papers: Part A
Network robustness and throughput can be improved by routing each source-to-terminal (s, t) demand via two link-disjoint paths (TLDP). However, the use of TLDP incurs higher energy cost. Henceforth, we address the problem of minimizing the energy usage of networks that use TLDP. Specifically, our problem is to maximally switch off redundant network links while maintaining at least 0zT100% of (s, t) TLDP in the network, for a given T, and limiting the maximum link utilization (MLU) to no greater than a configured threshold. To address this problem, we present a fast heuristic, called TLDP by Shortest Path First (TLDP-SPF), …
Impact Of Capacity Value Of Renewable Energy Resources On Raps System Energy Management, Y Tan, Kashem Muttaqi, Lasantha Meegahapola
Impact Of Capacity Value Of Renewable Energy Resources On Raps System Energy Management, Y Tan, Kashem Muttaqi, Lasantha Meegahapola
Faculty of Engineering and Information Sciences - Papers: Part A
Renewable energy resources are widely being utilised in remote area power supply (RAPS) systems. The capacity value of renewable energy resources in a RAPS system indicates the ability of renewable energy resources to serve the load demand in the RAPS systems. In this paper, the impact of capacity value of renewable resources on energy management of a RAPS system, while maintaining system reliability, is investigated. It is revealed that capacity value of renewable energy resources has direct influence on RAPS system energy management. By utilising storage in conjunction with renewable energy resources, the RAPS system can cater load demand while …
Feasibility Of Passivhaus Standards And Alternative Passive Design On Climatic Zones Of Chile - Determination Of Energy Requirements With Dynamic Simulation, Javier Carrasco Eade, Georgios Kokogiannakis
Feasibility Of Passivhaus Standards And Alternative Passive Design On Climatic Zones Of Chile - Determination Of Energy Requirements With Dynamic Simulation, Javier Carrasco Eade, Georgios Kokogiannakis
Faculty of Engineering and Information Sciences - Papers: Part A
The current building envelope standards from Article 4.1.10 of the “General Law of Urban Planning and Construction” The current building envelope standards from Article 4.1.10 of the “General Law of Urban Planning and Construction” in Chile are applied on a typical residential building for the climate of Concepción (36° Latitude South, 73° Longitude West) and a detailed energy simulation program is used to assess the energy performance of this building. The simulation results of the Chilean standards are then compared with simulation results of PassivHaus standards upon the same building layout and with simulation results from the same typical building …
Distributed Energy Storage For Mitigation Of Voltage-Rise Impact Caused By Rooftop Solar Pv, M J. E Alam, K M. Muttaqi, Darmawan Sutanto
Distributed Energy Storage For Mitigation Of Voltage-Rise Impact Caused By Rooftop Solar Pv, M J. E Alam, K M. Muttaqi, Darmawan Sutanto
Faculty of Engineering and Information Sciences - Papers: Part A
A high penetration of solar photovoltaic (PV) resources into distribution networks may create voltage rise problem when the generation from PV resources substantially exceeds the load demand. To reduce the voltage rise, the excess amount of power from the solar PV units needs to be reduced. In this paper, distributed storage systems are proposed for the mitigation of voltage rise problem. The surplus energy from the solar PV is used to charge the distributed storage units during midday, when the power from the solar PV would be typically higher than the load level. This stored energy is then used to …
Dynamic Characteristics Of A Hybrid Microgrid With Inverter And Non- Inverter Interfaced Renewable Energy Sources: A Case Study, A V. Jayawardena, L G. Meegahapola, S Perera, D A. Robinson
Dynamic Characteristics Of A Hybrid Microgrid With Inverter And Non- Inverter Interfaced Renewable Energy Sources: A Case Study, A V. Jayawardena, L G. Meegahapola, S Perera, D A. Robinson
Faculty of Engineering and Information Sciences - Papers: Part A
Microgrids are becoming important constituents of electric power distribution networks. Microgrids are typically comprised of both inverter interfaced (e.g. double-fed induction generator (DFIG), solar-photovoltaic (PV) system) and non-inverter interfaced (e.g. synchronous generator) renewable energy generators (REGs), hence their dynamic characteristics are significantly different from the conventional grids comprised of centralised synchronous generators. Different inherent characteristics of REGs, power dispatch levels, relative REG capacities, and external grid characteristics are some of the important features of significant interest in relation to microgrid dynamic behaviour. For this study a microgrid model was developed in DIgSILENT Power Factory based on the IEEE-13 bus system …
Control Of Five-Level Flying Capacitor Based Active-Neutral-Point-Clamped Converter For Grid Connected Wind Energy Applications, Sridhar R. Pulikanti, Kashem Muttaqi, D Suntanto
Control Of Five-Level Flying Capacitor Based Active-Neutral-Point-Clamped Converter For Grid Connected Wind Energy Applications, Sridhar R. Pulikanti, Kashem Muttaqi, D Suntanto
Faculty of Engineering and Information Sciences - Papers: Part A
Integration of wind energy sources into the distribution grid affects the voltage profile that could be stabilized through the grid reinforcement or limiting the active power injection. This paper presents a control strategy to regulate the voltage at point of common coupling (PCC) through reactive power exchange to the grid. The reactive power capability of the grid-connected hybrid multilevel converter is based on the voltage sensitivity of the distribution grid at PCC. A hybrid five-level multilevel converter referred as flying capacitor (FC) based active-neutral-point-clamped (ANPC) converter is considered. It is an arrangement of a three-level ANPC converter and a two-level …
Tribes As Essential Partners In Achieving Sustainable Governance, Prof. Elizabeth Burleson
Tribes As Essential Partners In Achieving Sustainable Governance, Prof. Elizabeth Burleson
Prof. Elizabeth Burleson
Indigenous peoples have modeled sustainable development around the world. Incentivizing the innovation and instillation of wind, solar, and other renewable energy sources can come in the form of public funding, including renewable portfolio standards, feed in tariffs and green tag programs. This article analyzes ways in which tribal communities are helping to expand cooperative good governance.
Octave Spanning Supercontinuum In An As2s3 Taper Using Ultralow Pump Pulse Energy, Darren D. Hudson, Stephen A. Dekker, Eric C. Magi, Alexander C. Judge, Stuart D. Jackson, Enbang Li, J S. Sanghera, L B. Shaw, I D. Aggarwal, Benjamin J. Eggleton
Octave Spanning Supercontinuum In An As2s3 Taper Using Ultralow Pump Pulse Energy, Darren D. Hudson, Stephen A. Dekker, Eric C. Magi, Alexander C. Judge, Stuart D. Jackson, Enbang Li, J S. Sanghera, L B. Shaw, I D. Aggarwal, Benjamin J. Eggleton
Faculty of Engineering and Information Sciences - Papers: Part A
An octave spanning spectrum is generated in an As2S3 taper via 77 pJ pulses from an ultrafast fiber laser. Using a previously developed tapering method, we construct a 1.3 μm taper that has a zero-dispersion wavelength around 1.4 μm . The low two-photon absorption of sulfide-based chalcogenide fiber allows for higher input powers than previous efforts in selenium-based chalcogenide tapered fibers. This higher power handling capability combined with input pulse chirp compensation allows an octave spanning spectrum to be generated directly from the taper using the unamplified laser output.
China In Context: Energy, Water, And Climate Cooperation, Prof. Elizabeth Burleson
China In Context: Energy, Water, And Climate Cooperation, Prof. Elizabeth Burleson
Prof. Elizabeth Burleson
Climate resilient communities can be achieved with the support of global research, development, deployment, and diffusion of environmentally sound low GHG emission technologies and processes. Technology cooperation should lower emissions remaining mindful of biodiversity, ecosystem services and livelihoods. China and the United States need to respond effectively to both economic and climate crises and can do so in part by cooperating on environmentally sound technology that transforms the global use of energy.
Multi-Criteria Group Decision Support With Linguistic Variables In Long-Term Scenarios For Belgian Energy Policy, Da Ruan, Jie Lu, Erik Laes, Guangquan Zhang, Jun Ma, Gaston Meskens
Multi-Criteria Group Decision Support With Linguistic Variables In Long-Term Scenarios For Belgian Energy Policy, Da Ruan, Jie Lu, Erik Laes, Guangquan Zhang, Jun Ma, Gaston Meskens
Faculty of Engineering and Information Sciences - Papers: Part A
Real world decisions often made in the presence of multiple, conflicting, and incommensurate criteria. Decision making requires multiple perspectives of different individuals as more decisions are made now in groups than ever before. This is particularly true when the decision environment becomes more complex such as sustainability policies study in environmental and energy sectors. Group decision making processes judgments or solutions for decision problems based on the input and feedback of multiple individuals. Multi-criteria decision and evaluation problems at tactical and strategic levels in practice involve fuzziness in terms of linguistic variables vis-à-vis criteria, weights, and decision maker judgments. Relevant …
High-Energy, Khz-Repetition-Rate, Ps Cryogenic Yb:Yag Chirped-Pulse Amplifier, Kyung-Han Hong, Juliet Gopinath, Darren Rand, Aleem M. Siddiqui, Shu-Wei Huang, Enbang Li, Benjamin J. Eggleton, John D. Hybl, Tso Yee Fan, Franz X. Kartner
High-Energy, Khz-Repetition-Rate, Ps Cryogenic Yb:Yag Chirped-Pulse Amplifier, Kyung-Han Hong, Juliet Gopinath, Darren Rand, Aleem M. Siddiqui, Shu-Wei Huang, Enbang Li, Benjamin J. Eggleton, John D. Hybl, Tso Yee Fan, Franz X. Kartner
Faculty of Engineering and Information Sciences - Papers: Part A
We demonstrate amplification of picosecond laser pulses to 40 mJ at a 2 kHz pulse repetition frequency (PRF) from a two-stage cryogenic chirped-pulse Yb:YAG amplifier, composed of a regenerative amplifier (RGA) and a two-pass booster amplifier. The RGA produces 8.2 mJ of energy at 2 kHz PRF and 13.2 mJ at 1 kHz PRF with excellent energy stability (~0.3% rms) and beam quality ( M2<1.1 ). Pulse stretching and compression are achieved by using a chirped fiber Bragg grating and a multilayer dielectric grating pair, respectively. Compressed 15 ps pulses from the RGA are obtained with a throughput efficiency of ~80% (~6.5 mJ for 2 kHz ). The booster amplifier further amplifies the pulses to 40 mJ at 2 kHz PRF, and ~32 mJ, ~15 ps pulses are expected after compression. The amplifier chain seeded from a femtosecond Yb-fiber laser enables the optical self-synchronization between signal and pump in optical parametric chirped-pulse amplifier applications.
High-Energy, Picosecond, Cryogenic Yb:Yag Chirped-Pulse Amplifier At Khz Repetition Rates For Opcpa Pumping, Kyung-Han Hong, Juliet Gopinath, Darren Rand, Aleem M. Siddiqui, Shu-Wei Huang, Enbang Li, Benjamin J. Eggleton, John D. Hybl, Tso Yee Fan, Franz X. Kartner
High-Energy, Picosecond, Cryogenic Yb:Yag Chirped-Pulse Amplifier At Khz Repetition Rates For Opcpa Pumping, Kyung-Han Hong, Juliet Gopinath, Darren Rand, Aleem M. Siddiqui, Shu-Wei Huang, Enbang Li, Benjamin J. Eggleton, John D. Hybl, Tso Yee Fan, Franz X. Kartner
Faculty of Engineering and Information Sciences - Papers: Part A
We report on the development of a 50-mJ-class ~10-ps chirped-pulse amplifier at kHz repetition rates using cryogenic Yb:YAG regenerative and multi-pass amplifiers. The system is well suited as pump laser for kHz high-average-power ultra-broadband OPCPAs. '2010 Optical Society of America
Adoption Of Dynamic Simulation For Energy Performance Rating Tool For Korean Residential Buildings: Edem-Samsung, Saeeta Ghauri, Cameron Johnstone, Jaemin Kim, Georgios Kokogiannakis, Paul Tuohy, Kyung-Hun Woo
Adoption Of Dynamic Simulation For Energy Performance Rating Tool For Korean Residential Buildings: Edem-Samsung, Saeeta Ghauri, Cameron Johnstone, Jaemin Kim, Georgios Kokogiannakis, Paul Tuohy, Kyung-Hun Woo
Faculty of Engineering and Information Sciences - Papers: Part A
Currently, there is a high emphasis on reducing the energy consumption and carbon emissions of buildings worldwide. Korea is facing an emerging issue of energy savings in buildings in perspective of new green economic policy. In this context, various policy measures including the energy efficiency ratings for buildings are being implemented for domestic and non-domestic buildings. In practice, design teams tend to prefer easy to use assessment tools to optimise energy performance and carbon ratings while they are concerned about calculation accuracy and the accurate representation of the dynamics involved associated with the characteristics of Korean residential buildings. This paper …
Experimental Study Of Using Renewable Energy In Yemen, Hani S. Alganahi, Kamaruzzaman S, Mohamed A, Ahmed M. Haidar, Ahmed Abdalla
Experimental Study Of Using Renewable Energy In Yemen, Hani S. Alganahi, Kamaruzzaman S, Mohamed A, Ahmed M. Haidar, Ahmed Abdalla
Faculty of Engineering and Information Sciences - Papers: Part A
During the last decade, there has been an increased interest to develop renewable energy technologies that could contribute to ever-increasing energy needs. This paper proposes a new PV array-wind-diesel generator hybrid system model to determine the optimal configuration of power systems relevant to different regions in Yemen, Sana’a and Aden. Various renewable and nonrenewable energy sources, energy storage and their applicability in terms of cost and performance are discussed. The collected data for the wind, solar radiation and diesel price were obtained from Civil Aviation & Meteorology Authority in Yemen. The Sensitivity analysis was carried out using Homer program. The …
Study Of The Energy Performance Of Korean Apartment Buildings With Alternative Balcony Configurations, Jo Clarke, Cameron Johnstone, Jaemin Kim, Georgios Kokogiannakis, Paul Strachan, Kyung-Hun Woo, Boo-Sik Kang
Study Of The Energy Performance Of Korean Apartment Buildings With Alternative Balcony Configurations, Jo Clarke, Cameron Johnstone, Jaemin Kim, Georgios Kokogiannakis, Paul Strachan, Kyung-Hun Woo, Boo-Sik Kang
Faculty of Engineering and Information Sciences - Papers: Part A
The purpose of this study is to evaluate the impact of the new regulations design changes on heating loads of apartment buildings and identify the construction configurations (e.g. glazing types, thermal properties, window area ratio, etc.) of the new designs that will ensure the energy performance is at least on the same level as those with a traditional balcony configuration.
Energy Storage System For Reduction Of Mid-Line Voltage Variation Of A Dfig Wnd Turbine Connected To A Weak Grid, M Aktarujjaman, Kashem M. Muttaqi, Michael Negnevitsky, Gerard Ledwich
Energy Storage System For Reduction Of Mid-Line Voltage Variation Of A Dfig Wnd Turbine Connected To A Weak Grid, M Aktarujjaman, Kashem M. Muttaqi, Michael Negnevitsky, Gerard Ledwich
Faculty of Engineering and Information Sciences - Papers: Part A
Penetration of wind power into electricity system is constantly increasing. Wind resources are usually distant from existing transmission lines. Wind farms are often connected to weak grids far from central generation stations. Maximum wind power extraction causes the more irregular and unpredicted power output of wind turbine, which has same nature as wind speed variation. The voltage in such long line is vulnerable with the consumption and generation imbalance. In a long line, the mid-line voltage is largely affected by the variation and the penetration of the wind fluctuating power. Fluctuating nature of wind power output and long transmission line …
Energy Injection By Disbributed Generation For Enhancement Of Voltage Profile In Swer Systems, Kashem M. Muttaqi, Gerard Ledwich
Energy Injection By Disbributed Generation For Enhancement Of Voltage Profile In Swer Systems, Kashem M. Muttaqi, Gerard Ledwich
Faculty of Engineering and Information Sciences - Papers: Part A
A system with Distributed Generation (DG) has greater load carrying capacity and can correct for a poor voltage profile during peak loading. This paper addresses the loading patterns of rural feeders and the relative effectiveness of real and reactive injection to support voltage profile in Single Wire Earth Return (SWER) systems. Real and reactive injection on a SWER network has been investigated and required energy for voltage enhancement estimated. DG with real and reactive injection (DG-PQ) using Q priority (DG-QPQ) can drastically reduce fuel and energy requirements compared to the amount required by proportional use of real and reactive power …
Energy Injection By Distributed Generation For Improvement In Feeder-Voltage Profile, Kashem M. Muttaqi, Gerard Ledwich
Energy Injection By Distributed Generation For Improvement In Feeder-Voltage Profile, Kashem M. Muttaqi, Gerard Ledwich
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Synchrotron Radiation Based Experimental Determination Of The Optimal Energy For Cell Radiotoxicity Enhancement Following Photoelectric Effect On Stable Iodinated Compounds, S Corde, A Joubert, J F. Adam, A M. Charvet, J F. Le Bas, F Esteve, H Elleaume, J Balosso
Synchrotron Radiation Based Experimental Determination Of The Optimal Energy For Cell Radiotoxicity Enhancement Following Photoelectric Effect On Stable Iodinated Compounds, S Corde, A Joubert, J F. Adam, A M. Charvet, J F. Le Bas, F Esteve, H Elleaume, J Balosso
Faculty of Engineering and Information Sciences - Papers: Part A
This study was designed to experimentally evaluate the optimal X-ray energy for increasing the radiation energy absorbed in tumours loaded with iodinated compounds, using the photoelectric effect. SQ20B human cells were irradiated with synchrotron monochromatic beam tuned at 32.8, 33.5, 50 and 70 keV. Two cell treatments were compared to the control: cells suspended in 10 mg ml1 of iodine radiological contrast agent or cells pre-exposed with 10 mM of iodo-desoxyuridine (IUdR) for 48 h. Our radiobiological end point was clonogenic cell survival. Cells irradiated with both iodine compounds exhibited a radiation sensitisation enhancement. Moreover, it was energy dependent, with …
Chain Entanglements And Fracture Energy In Interfaces Between Immiscible Polymers, Leonardo Silvestri, Hugh Ralph Brown, Stefano Carra, Sergio Carra
Chain Entanglements And Fracture Energy In Interfaces Between Immiscible Polymers, Leonardo Silvestri, Hugh Ralph Brown, Stefano Carra, Sergio Carra
Faculty of Engineering and Information Sciences - Papers: Part A
It is a very well-known experimental fact that the toughness of interfaces obtained by joining pairs of immiscible glassy polymers is strongly correlated to the interfacial width. Several models have been proposed in the literature to estimate the fracture energy of these interfaces, but the agreement displayed with the experimental data cannot be considered satisfactory. In this paper a new model is proposed for polymers with molecular weight higher than the critical value for the onset of entanglements. The model is based on a precise and realistic calculation of the areal density of entangled strands across the interface, that is …