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Добірка наукової літератури з теми "Current load"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Current load"

Ullah, Ibrar, Irshad Hussain, Khalid Rehman, Piotr Wróblewski, Wojciech Lewicki, and Balasubramanian Prabhu Kavin. "Exploiting the Moth–Flame Optimization Algorithm for Optimal Load Management of the University Campus: A Viable Approach in the Academia Sector." Energies 15, no. 10 (May 19, 2022): 3741. http://dx.doi.org/10.3390/en15103741.

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Unbalanced load condition is one of the major issues of all commercial, industrial and residential sectors. Unbalanced load means that, when different loads are distributed on a three-phase four-wire system, unequal currents pass through the three phases. Due to it, a heavy current flows in the neutral wire, which not only adds the losses, but also puts constraints on three phases’ loads. In this paper, we have presented a practical approach for load balancing. First, we have considered the existing three-phase load system where the supply is a three-phase unbalanced supply. Before balancing the load, it is necessary to compensate the current in neutral wire. A nature-inspired moth–flame optimization (MFO) algorithm is used to propose a scheme for balancing of current in neutral wire. The information of a distributed single-phase load was used to balance the currents in a three-phase system. The feeder phase and load profiles of each single-phase load are used to reconfigure the network using an optimization process. By balancing the current of three phases, the current of the neutral conductor in substation transformers was reduced to almost zero.

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Zhuikov, V. J., I. V. Verbytskyi, and A. G. Kyselova. "REACTIVE POWER COMPENSATION APPROACH WITH DYNAMIC MODE OF LOAD CURRENT." Tekhnichna Elektrodynamika 2018, no. 4 (May 15, 2018): 47–52. http://dx.doi.org/10.15407/techned2018.04.047.

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Wu, Sheng, and Kwok L. Lo. "Non-Intrusive Monitoring Algorithm for Resident Loads with Similar Electrical Characteristic." Processes 8, no. 11 (October 30, 2020): 1385. http://dx.doi.org/10.3390/pr8111385.

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Non-intrusive load monitoring is a vital part of an overall load management scheme. One major disadvantage of existing non-intrusive load monitoring methods is the difficulty to accurately identify loads with similar electrical characteristics. To overcome the various switching probability of loads with similar characteristics in a specific time period, a new non-intrusive load monitoring method is proposed in this paper which will modify monitoring results based on load switching probability distribution curve. Firstly, according to the addition theorem of load working currents, the complex current is decomposed into the independently working current of each load. Secondly, based on the load working current, the initial identification of load is achieved with current frequency domain components, and then the load switching times in each hour is counted due to the initial identified results. Thirdly, a back propagation (BP) neural network is trained by the counted results, the switching probability distribution curve of an identified load is fitted with the BP neural network. Finally, the load operation pattern is profiled according to the switching probability distribution curve, the load operation pattern is used to modify identification result. The effectiveness of the method is verified by the measured data. This approach combines the operation pattern of load to modify the identification results, which improves the ability to identify loads with similar electrical characteristics.

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Bendig, M., M. Ksoll, A. Kalter, M. Schaak, K. Ermeler, and A. Schnettler. "Synthetic Testing of Load Current Interruption in Medium Voltage Load Break Switches." PLASMA PHYSICS AND TECHNOLOGY 4, no. 3 (2017): 241–44. http://dx.doi.org/10.14311/ppt.2017.3.241.

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To conduct the mainly active load current test duty according to IEC 62271-103, a directly powered test circuit and therefore a medium voltage connection or a power generator is needed. A newly developed synthetic test circuit allows to replicate the current as well as the full transient recovery voltage (TRV) and the power frequent recovery voltage (RV) of the direct test circuit up to its crest value. It is dimensioned for voltage classes up to 52 kV and can be adapted to test currents between 630 A and 1250 A. The test circuit allows a detailed investigation of load break switches without costly high power sources and loads. Many parameters, like current and voltage steepness at current zero, as well as different parameters defining the TRV steepness can be varied individually.

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Et. al., Venkatesh E. ,. "Current Harmonics Reduction In Microgrids Using Dual Interfacing Converters." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 2 (April 10, 2021): 1647–54. http://dx.doi.org/10.17762/turcomat.v12i2.1450.

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The Growing Installation of Distributed Generation (DG) units in low voltage conveyance frameworks has promoted the idea of nonlinear load symphonious current remuneration utilizing multi-utilitarian DG interfacing converters. In appropriation frameworks, the load has been an unexpected increment or diminishes and it resembles as nonlinear loads so the load draw non-sinusoidal flows from the AC mains and causes the load sounds and responsive power, and over the top impartial flows that give contamination in power frameworks. It is investigated in this paper that the pay of neighborhood load symphonious current utilizing a solitary DG interfacing converter may make the intensification of supply voltage sounds touchy loads, especially when the primary framework voltage is profoundly twisted. To address this impediment, in contrast to the activity of customary unified power quality conditioners (UPQC) with arrangement converter, another concurrent stock voltage and matrix current symphonious pay technique is proposed utilizing composed control of two shunt interfacing converters. Through the presentation of staggered control destinations, it is delineated that the proposed framework could ride through voltage unsettling influences and proceed with the power move between the nearby generation and the matrix, while an excellent voltage is kept up for the neighborhood loads. By utilizing this proposed regulator, the lattice voltage stage bolted circle and the identification of the load current and the stockpile voltage music are superfluous for both interfacing converters. In this manner, the computational load of interfacing converters can be fundamentally decreased. Mimicked and test results are caught to approve the exhibition of the proposed geography and the control technique.

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Shurupov, Alexei, Alexander Kozlov, Mikhail Shurupov, Valentina Zavalova, Anatoly Zhitlukhin, Vitalliy Bakhtin, Nikolai Umrikhin, and Alexei Es’kov. "Pulse-Current Sources for Plasma Accelerators." Energies 11, no. 11 (November 7, 2018): 3057. http://dx.doi.org/10.3390/en11113057.

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The pulse source for plasma-accelerators supply operates under the conditions of nonlinear growth of load inductance, which complicates the matching of the source and the load. This article presents experimental studies of the use of both traditional pulse-energy sources based on capacitive storage and alternative ones based on explosive magnetic generators (EMG). It is shown that the EMG with the special device of the current-pulse formation more effectively matches with such a plasma load as the pulse plasma-accelerator (PPA). This device allows a wide range to manage the current-pulse formation in a variable load and, consequently, to optimize the operation of the power source for the specific plasma load. A mathematical model describing the principle of operation of this device in EMG on inductive load was developed. The key adjustable parameters are the current into the load, the residual inductance of the EMG, and the sample time of the specified inductance and the final current in the load. The device was successfully tested in experiments with the operation on both one and two accelerators connected in parallel. In the experiments, the optimal mode of device operation was found in which the total energy inputted to a pair of accelerators in one pulse reached 0.55 MJ, and the maximum current reached about 3.5 MA. A comparison with the results of experiments performed with capacitive sources of the same level of stored energy is given. The experiments confirmed not only the principal possibility of using EMG with a special device of current-pulse formation for operation with plasma loads in the MJ energy range but also showed the advantages of its application with specific types of plasma load.

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Xia, Minghe, Fengping Li, Ce Ji, Bing Wei, Shuping Feng, Meng Wang, and Weiping Xie. "Current pulse shaping of the load current on PTS." AIP Advances 6, no. 2 (February 2016): 025319. http://dx.doi.org/10.1063/1.4942816.

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Cortes, Patricio, JosÉ Rodriguez, Daniel E. Quevedo, and Cesar Silva. "Predictive Current Control Strategy With Imposed Load Current Spectrum." IEEE Transactions on Power Electronics 23, no. 2 (March 2008): 612–18. http://dx.doi.org/10.1109/tpel.2007.915605.

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Sadeghi, J. M. "Experimental evaluation of accuracy of current practices in analysis and design of railway track sleepers." Canadian Journal of Civil Engineering 35, no. 9 (September 2008): 881–93. http://dx.doi.org/10.1139/l08-026.

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This research investigates the accuracy of the assumptions made in the current method of analysis and design of railway track sleepers. This study consists of a comprehensive field investigation into the response of sleepers in a railway track system to static and dynamic loads. In the experiments, several load cells (load gauges) are installed under a rail seat and beneath a B70 concrete sleeper for the purpose of monitoring the response of the sleeper to vertical loads. The dynamic coefficients factor, the ratio of the rail seat load to the wheel load and the pressures between the sleeper and the ballast are measured. The results are used to evaluate the current approaches for the analysis and design of concrete sleepers, in particular those proposed by the Americans (AREMA) and Europeans (UIC). New models are proposed for the calculation of dynamic load factors, correlations between wheel loads and rail seat loads, and load distribution patterns beneath sleepers.

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Shcherbinin, A. G., N. M. Trufanova, and V. G. Savchenko. "Method of determining cable-current load." Russian Electrical Engineering 81, no. 6 (June 2010): 334–37. http://dx.doi.org/10.3103/s1068371210060118.

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Більше джерел

Дисертації з теми "Current load"

Ma, Shuhan. "Load-current response to severe changes of voltage." Thesis, KTH, Elektroteknisk teori och konstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-203894.

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Electric loads, such as computers, lamps, refrigerators and heaters connected to low-voltage distributionsystems in homes and offices differ widely in how their current responds to changes in the applied voltage.These voltage changes could be a total collapse of the voltage, a weak or strong reduction of amplitude,or a sudden phase-shift.This thesis investigates the currents into some modern power-electronic interfaced loads, at sub-cycletimescales, in response to sudden changes of AC voltage magnitude. One reason for this interest was anearlier project about fault-location methods in which the necessary level of modeling of loads wasquestioned [1]. A related issue that is also investigated is the response of such loads when Wye-connectedin a three-phase system with a high-impedance neutral such as a broken conductor.Several related matters have been studied a lot in other work. For example, active and reactive powerconsumptions of loads can change in response to the variation of voltage magnitude and frequency.Studies of power system oscillations, and angle and voltage stability, typically make use of such models.At distribution level, the relation of power consumption of loads to the feeder voltage has been includedin studies of Conservation Voltage Reduction (CVR). In these examples, the variation of voltage is typicallysmall, and the result is a value that summarizes an entire cycle (active or reactive power) without givinginformation about the current’s faster changes. Studies of voltage dip tolerance have instead workedwith larger changes of voltage, and short and variable durations, but without the resulting current beingthe interest.This thesis starts with a literature survey about different types of modern loads with differentcharacteristics, especially electronic loads which have become a far greater proportion of the totaldistribution-system load over the past several decades. It is known that the number of the electronicdevices has increased significantly due to the boom in the consumer electronic market. The most commonexamples of these loads include: computers, monitors, TVs and DVD players. Based on a survey of loadbehaviors and models, the current response of these loads to the voltage dips or recoveries are modeledby circuit simulation. Measurements of the currents into some computer equipment were performedwith voltage dips and recoveries, and compared to the results from models. The voltage amplitude dropsto 25%, 50% or 75% of its original value, and recovers afterwards. The current response is studied, focusingmainly during a short time period up to a few AC cycles. A similar mixture of simulation and measurementis then used to study the situation of the potential that arises at the neutral point of a three-phaseconnected electronic load when the neutral conductor has a high resistance.
Elektriska laster i hem och kontor, såsom datorer, lampor, kylskåp och värmare, anslutna tilllågspänningsdistributionsnätet, varierar kraftigt i hur deras strömmar reagerar till förändringar ispänningen, vilka kan exempelvis vara en svag eller stark minskning av spänningsamplituden eller enplötslig fasförskjutning.Denna avhandling undersöker strömmarna i vissa moderna slags laster, vilka har effektelektroniskgränsnitt mellan nätet och effektförbrukningen. Strömmarna betraktas även på tidsskalor mindre än enperiod av nätfrekvensen. En anledning till intresset var ett tidigare projekt om fellokaliseringsmetodersom ifrågasatte den nödvändiga nivån av lastmodellering [1]. En relaterad fråga som också utreds ärbeteendet av sådana laster när de är Y-anslutna i ett tre-fas system med hög impedans i nolledaren.Flera aspekter av lastmodellering har studerats i tidigare arbete. Aktiv och reaktiv strömförbrukning avlaster som konsekvens av spänningsamplitud och frekvensen har studerats för modellering av elsystemetssvängningar samt vinkel- och spänningsstabilitet. I distributionsnätet har förhållandet mellan lastersströmförbrukning spänningsamplituden inkluderats i studier av ”CVR” (conservation voltage reduction). Idessa exempel är variationen av spänningen vanligtvis små och resultatet är ett värde som sammanfattaren hel cykel (aktiv eller reaktiv effekt) utan att ge information om snabbare förändringar. Studier avtolerans av laster till spänningssjunkningar har istället arbetat med större ändringar av spänning och kortoch variabel varaktigheter, men utan att ta intresse på den resulterande strömmen.Avhandlingen inleds med en litteraturstudie om olika typer av moderna laster med olika egenskaper,särskilt elektroniska laster som har blivit en mycket större andel av distributionnätets belastning under desenaste decennierna. Antalet elektroniska enheter har ökat betydligt: vanliga exempel av sådana laster ärdatorer, bildskärmar, TV och DVD-spelare. Baserat på litteratur om sådana laster och deras modeller, harresponsen av dessa laster till spänningssjunkningar eller återställningar modelleras genomkretssimuleringar. Mätningar har också utförts, av strömmarna i några datorutrustningar, vid spänningarsom sjunker med 25%, 50% eller 75% av det ursprungliga värdet och återställs efteråt. Dessa mätningarjämförs med resultaten från modellerna. Tidsramen av intresse är från millisekunder upp till någraperioder av nätfrekvensen. En liknande kombination av simulering och mätning har också använts för attstudera situationen där faror kan uppstå vid bruten nolledare i ett trefassystem.

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Jonsson, Erik. "Load Current Interruption in Air for Medium Voltage Ratings." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24327.

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Load break switches (LBSs) are common inside metal clad switchgear assemblies where space is a limiting factor. SF6 is usually used in this application due to its superior electrical characteristics, but is unfortunately also a strong greenhouse gas. Therefore development of new products, utilizing air which is an environmental friendly alternative, is in progress. Since air has much lower dielectric strength than SF6, the main challenge with this is therefore to reduce the size. Compact SF6 products have created a retrofit market, and in many existing installation sites larger products will not fit. Current interruption is a complex process and depends on several parameters, and it is not straight forward to optimize the design of a medium voltage (MV) switch. Numerical simulation which is a common for product development in other areas is difficult for this application. Due to the long dominance of SF6 products, little research has been published about the design criteria for LBS technology in air. The scope of the thesis covers current interruption of MV LBSs in air with respect to various design parameters, such as nozzle geometry, nozzle materials, gas flow, and contact movement. Both gas blow-assisted current interruption (associated with puffer breakers) and ablation-assisted current interruption are addressed. The material in the nozzle can enhance the interruption capability. Such a nozzle material is called ablation material. When the arc is burning close to the surface of an ablation material, gas is evaporated which cools the arc. This technology is used to some extent for low voltage switchgear, but much less for higher voltages. The objective is therefore to investigate the potential of this technology for the MV LBS application. All work is done experimentally with similar test conditions as are used for product type testing. A direct powered MV laboratory and a test switch are built. The test switch is designed particularly for parameter studies. The result from air blow experiments reveal the minimum upstream pressure drop required for current interruption for various basic nozzle geometries, and at different contact positions. One study is particular relevant for the 24 kV / 630 A class, and it is found that 0.25 - 0.3 bar upstream pressure drop appears to be a threshold value for successful interruption. It is also presented how the minimum upstream pressure drop varies for different MV LBS ratings. The results show that the needed pressure drop is approximately proportional, both towards the current and towards the rate of rise of recovery voltage. This investigation is made so that the majority of all MV LBS ratings (7 - 52 kV and up to 900 A) are covered. From the ablation experiments it was found that high content of hydrogen in the ablation material is favorable for enhancing the current interruption capability. In a comparison experiment between different polymers, polypropylene shows best interruption capability. This material was therefor applied as ablation material in the test switch, and tested in the MV laboratory. The results reveal high capability to interrupt the thermal phase (over the needs for most MV LBSs), but also that the transient recovery voltage several milliseconds after current zero often leads to dielectric re-ignition. This is opposite to a puffer breaker where the thermal interruption instead appears to be the crucial part.

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Moore, Jonathan E. "Frequency-based load sharing in current-mode-controlled buck converters." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA362884.

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Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, March 1999.
"March 1999". Thesis advisor(s): John G. Ciezki, Robert W. Ashton. Includes bibliographical references (p. 103-105). Also available online.

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Su, Yipeng. "High Frequency, High Current 3D Integrated Point-of-Load Module." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/51248.

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Point-of-load (POL) converters have been used extensively in IT products. Today, almost every microprocessor is powered by a multi-phase POL converter with high output current, which is also known as voltage regulator (VR). In the state-of-the-art VRs, the circuits are mostly constructed with discrete components and situated on the motherboard, where it can occupy more than 1/3 of the footprint of the motherboard. A compact POL is desirable to save precious space on motherboards to be used for some other critical functionalities. Recently, industry has released many modularized POL converters, in which the bulky inductor is integrated with the active components to increase the power density. This concept has been demonstrated at current levels less than 5A and power density around 600-1000W/in3. This might address the needs of small hand-held equipment such as smart phones, but it is far from meeting the needs for the applications such as laptops, desktops and servers, where tens and hundreds of amperes are needed. A 3D integrated POL module with an output current of tens of ampere has been successfully demonstrated at the Center for Power Electronic Systems (CPES), Virginia Tech. In this structure, the inductor is elaborated with low temperature co-fire ceramic (LTCC) ferrite, as a substrate where the active components are placed. The lateral flux inductor is proposed to achieve both a low profile and high power density. Generally, the size of the inductor can be continuously shrunk by raising the switching frequency. The emerging gallium-nitride (GaN) power devices enable the creation and use of a multi-MHz, high efficiency POL converter. This dissertation firstly explores the LTCC inductor substrate design in the multi-MHz range for a high-current POL module with GaN devices. The impacts of different frequencies and different LTCC ferrite materials on the inductor are also discussed. Thanks to the DC flux cancellation effect, the inverse coupled inductor further improves the power density of a 20A, 5MHz two-phase POL module to more than 1kW/in3. An FEA simulation model is developed to study the core loss of the lateral flux coupled inductor, which shows the inverse coupling is also beneficial for core loss reduction. The ceramic-based 3D integrated POL module, however, is not widely adopted in industrial products because of the relatively high cost of the LTCC ferrite material and complicated manufacturing process. To solve that problem, a printed circuit board (PCB) inductor substrate with embedded alloy flake composite core is proposed. The layerwise magnetic core is laminated into a multi-layer PCB, and the winding of the inductor then is formed by the copper layers and conventional PCB vias. As a demonstration of system integration, a 20A, 1.5MHz integrated POL module is designed and fabricated based on a 4-layer PCB with embedded flake core, which realizes more than 85% efficiency and 600W/in3 power density. The application of standardized PCB processes reduces the cost for manufacturing the integrated modules due to the easy automation and the low temperature manufacturing process. Combining the PCB-embedded coupled inductor substrate and advanced control strategy, the two-phase 40A POL modules are elaborated as a complete integrated laptop VR solution. The coupled inductor structure is slightly modified to improve its transient performance. The nonlinearity of the inductance is controlled by adding either air slots or low permeability magnetic slots into the leakage flux path of the coupled inductor. Then the leakage flux, which determines the transient response of the coupled inductor, can be well controlled. If we directly replace the discrete VR solution with the proposed integrated modules, more than 50% of the footprint on the motherboard can be saved. Although the benefits of the lateral flux inductor have been validated in terms of its high power density and low profile, the planar core is excited under very non-uniform flux. Some parts of the core are even pushed into the saturation region, which totally goes against the conventional sense of magnetic design. The final part of this dissertation focuses on evaluating the performance of the planar core with variable flux. The counterbalance between DC flux and AC flux is revealed, with which the AC flux and the core loss density are automatically limited in the saturated core. The saturation is essentially no longer detrimental in this special structure. Compared with the conventional uniform flux design, the variable flux structure extends the operating point into the saturation region, which gives better utilization of the core. In addition, the planar core with variable flux also provides better thermal management and more core loss reduction under light load. As conclusions, this research first challenges the conventional magnetic design rules, which always assumes uniform flux. The unique characteristics and benefits of the variable flux core are proved. As an example of taking advantages of the lateral flux inductor, the PCB integrated POL modules are proposed and demonstrated as a high-density VR solution. The integrated modules are cost-effective and ready to be commercialized, which could enable the next technological innovation for the whole computing and telecom industry.
Ph. D.

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Garcia, Robert John. "THE EFFECTS OF COMPENSATION ON LOAD TRANSIENT RESPONSE IN SWITCHED MODE POWER CONVERTERS." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/291724.

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Lam, Hoi-yee. "Voltage-current trajectory a 2-dimensional approach to understand electrical load signatures /." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B3890861X.

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Lam, Hoi-yee, and 林凱儀. "Voltage-current trajectory: a 2-dimensional approach to understand electrical load signatures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B3890861X.

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Suh, Inyoung. "Determining the load composition in commercial buildings based upon harmonic current characteristics /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.

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Forslund, Johan. "Experimental Results of a Load-Controlled Vertical Axis Marine Current Energy Converter." Licentiate thesis, Uppsala universitet, Elektricitetslära, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-268867.

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This thesis investigates the load control of a marine current energy converter using a vertical axis turbine mounted on a permanent magnet synchronous generator. The purpose of this thesis is to show the work done in the so far relatively uncharted territory of control systems for hydro kinetic energy conversion. The work is in its early stage and is meant to serve as a guide forfuture development of the control system. An experimental power station has been deployed and the first results are presented. A comparison between three load control methods has been made; a fixedAC load, a fixed pulse width modulated DC load and a DC bus voltage control of a DC load. Experimental results show that the DC bus voltage control reduces the variation of rotational speed with a factor of 3.5. For all three cases, the tip speed ratio of the turbine can be kept close to the expected optimal tip speed ratio. However, for all three cases the average extracted power was significantly lower than the average power available in the turbine times the estimated maximum power coefficient. A maximum power point tracking system, with or without water velocity measurement, should increase the average extracted power. A simulation model has been validated using experimental data. The simulated system consists of the electrical system and a hydrodynamic vortex model for the turbine. Experiments of no load operation were conducted to calibrate the drag losses of the turbine. Simulations were able to predict the behaviour in a step response for a change in tip speed ratio when the turbine was operated close to optimal tip speed ratio. The start position of the turbine was varied in the simulation to view the influence on the step response from a changed turbine position relative to the direction of the water flow.

Funders: J Gust Richert, Bixia Miljöfond

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Nyhlén, Erik. "Control of marine current energy conversion system." Thesis, Uppsala University, Electricity, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-129988.

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This thesis involves the development of a system for control of a marine current energy conversion system. The control system is developed on the principles of load control, i.e. it aims to control the rotational speed of the turbine by controlling the power extracted from the generator. The system operates by feedback of the generator DC-voltage and current as well as the speed of the water current passing through the turbine. An IGBT-transistor controlled by an AVR-microcontroller executes control of the generator and hence the turbine. A digitally implemented PID-controller serves as the fundamental automatic control regime. The control system can be operated from a PC-application connected to the microcontroller through a serial wire connection. From the graphical user interface ofthe PC-application the system operator can set the system control parameters and monitor the state of the generator and turbine. The control system can be set to keep the turbine operating at a desired tip speed ratio, rotational speed or generator voltage. Further, for purposes of indoor testing of the control system a separate system, a motor control system, was developed as a part of this thesis work. The purpose of the motor control system is to enable simulating the behavior of a turbine with a motor driving the generator instead of an actual turbine. The motor control system operates by control of an ACS800 variable frequency drive that is connected to the motor. The motor control system allows its operator to feed in data describing the variations in water speed over time as well as data describing how the simulated turbine's power coefficient depends on its tip speed ratio. From this data the motor control system continuously calculates the torque that should be put on the generator axis by the motor. Results from test runs of the system show that the performance of the system is good. The system responds quickly to changes in the control parameters. Also the system manages to keep the specified control parameter quite well even during rapid changes in the water speed.

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Книги з теми "Current load"

Moore, Jonathan E. Frequency-based load sharing in current-mode-controlled buck converters. Monterey, Calif: Naval Postgraduate School, 1999.

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Yenchek, M. R. Impact of current load on mine trailing cable thermal life. Washington, D.C. (2401 E St., N.W., MS #9800, Washington 20241-0001): U.S. Dept. of the Interior, Bureau of Mines, 1991.

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Martin, Roderick H. Interlaminar fracture characterization: A current review. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1991.

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Pollock, Helen. A series-parallel load-resonant converter for a controlled-current arc-welding power supply. [s.l.]: typescript, 1996.

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Institute Of Electrical and Electronics Engineers. IEEE standard for three-phase, manually operated subsurface and vault load-interrupting switches for alternating-current systems. New York, N.Y: Institute of Electrical and Electronics Engineers, 2001.

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Loud and clear. New York: Random House Large Print, 2004.

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Loud and clear. New York: Random House, 2004.

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Quindlen, Anna. Loud and Clear. New York: Random House Publishing Group, 2004.

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Fraas, Charlotte Jones. The guaranteed student loan programs: Current status and issues. [Washington, D.C.]: Congressional Research Service, Library of Congress, 1991.

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United States. Federal Trade Commission. Bureau of Economics. Improving consumer mortgage disclosures: An empirical assessment of current and prototype disclosure forms. Washington, DC: U.S. FTC, 2007.

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Частини книг з теми "Current load"

Lantsoght, Eva O. L. "Current Codes and Guidelines." In Load Testing of Bridges, 29–69. Leiden : CRC Press/Balkema, [2019] | Series: Structures and infrastructures series, ISSN 1747–7735 ; volumes 12–13: CRC Press, 2019. http://dx.doi.org/10.1201/9780429265426-3.

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Seeber, Kilian G. "Cognitive load in simultaneous interpreting." In Benjamins Current Topics, 18–33. Amsterdam: John Benjamins Publishing Company, 2015. http://dx.doi.org/10.1075/bct.72.03see.

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De Doncker, Rik, Duco W. J. Pulle, and André Veltman. "Current Control of Generalized Load." In Advanced Electrical Drives, 55–94. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0181-6_3.

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De Doncker, Rik W., Duco W. J. Pulle, and André Veltman. "Current Control of Generalized Load." In Advanced Electrical Drives, 55–93. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-48977-9_3.

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Liu, Hui. "Steady-State Current Decomposition Based Appliance Identification." In Non-intrusive Load Monitoring, 105–40. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-1860-7_5.

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Rossi, Mattia, Nicola Toscani, Marco Mauri, and Francesco Castelli Dezza. "Current Control of an RL Load." In Introduction to Microcontroller Programming for Power Electronics Control Applications, 273–98. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003196938-17.

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Kłos, Andrzej. "Current-Based Method of Load Flow Solution." In Mathematical Models of Electrical Network Systems, 97–105. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52178-7_15.

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Gupta, Kirti, Neeta Pandey, and Maneesha Gupta. "CML Gates with Modified Load." In Model and Design of Improved Current Mode Logic Gates, 103–25. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0982-7_5.

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Riemersma, D. J., H. C. Schamhardt, and J. L. M. A. Lammertink. "In Vivo Tendon Load and Tendon Strain in the Horse." In Biomechanics: Current Interdisciplinary Research, 731–36. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-011-7432-9_111.

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Xing, Ying. "Load Distribution for Distributed Stream Processing." In Current Trends in Database Technology - EDBT 2004 Workshops, 112–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-30192-9_11.

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Тези доповідей конференцій з теми "Current load"

Krestinskaya, Olga, Irina Fedorova, and Alex Pappachen James. "Memristor load current mirror circuit." In 2015 International Conference on Advances in Computing, Communications and Informatics (ICACCI). IEEE, 2015. http://dx.doi.org/10.1109/icacci.2015.7275664.

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Cortes, Patricio, Jose Rodriguez, Daniel Quevedo, and Cesar Silva. "Predictive Current Control Strategy with Imposed Load Current Spectrum." In 2006 12th International Power Electronics and Motion Control Conference. IEEE, 2006. http://dx.doi.org/10.1109/epepemc.2006.283088.

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Han, Zhigang, and Jingya Han. "A fast transient load current regulator." In 2011 Second International Conference on Mechanic Automation and Control Engineering (MACE). IEEE, 2011. http://dx.doi.org/10.1109/mace.2011.5987088.

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Vary, Michal, Juraj Packa, Vladimir Durman, Jaroslav Lelak, and Vladimir Saly. "Polarization in cables with current load." In 2018 19th International Scientific Conference on Electric Power Engineering (EPE). IEEE, 2018. http://dx.doi.org/10.1109/epe.2018.8396001.

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Savic, Filip, Giacomo Calabrese, and Giovanni Frattini. "Adaptive Load Current Feedforward Control of Pulsed Output Current Converters." In 2018 International Symposium on Industrial Electronics (INDEL). IEEE, 2018. http://dx.doi.org/10.1109/indel.2018.8637628.

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Saritha, B., and P. A. Janakiraman. "Load Current estimation in single-phase inverters using D.C. line current." In 2006 IEEE International Conference on Industrial Technology. IEEE, 2006. http://dx.doi.org/10.1109/icit.2006.372199.

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Arora, Sameer, Poras T. Balsara, and Dinesh K. Bhatia. "Digital implementation of constant power load (CPL), active resistive load, constant current load and combinations." In 2016 IEEE Dallas Circuits and Systems Conference (DCAS). IEEE, 2016. http://dx.doi.org/10.1109/dcas.2016.7791138.

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Bouhouras, Aggelos S., Konstantinos C. Chatzisavvas, Evangelos Panagiotou, Nikolaos Poulakis, Constantinos Parisses, and Georgios C. Christoforidis. "Load signatures development via harmonic current vectors." In 2017 52nd International Universities Power Engineering Conference (UPEC). IEEE, 2017. http://dx.doi.org/10.1109/upec.2017.8231902.

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Chuvatin, A. S., V. L. Kantsyrev, A. L. Astanovitsky, R. Presura, A. S. Safronova, B. LeGalloudec, V. Nalajala, et al. "Advanced load current multiplier on Zebra generator." In 2011 IEEE Pulsed Power Conference (PPC). IEEE, 2011. http://dx.doi.org/10.1109/ppc.2011.6191628.

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Звіти організацій з теми "Current load"

Cannell, Michael J., and Richard A. McConnell. Magnetic Flux-Load Current Interactions in Ferrous Conductors. Fort Belvoir, VA: Defense Technical Information Center, June 1992. http://dx.doi.org/10.21236/ada256632.

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Griffith, Timothy E. Evaluation of an Electronic Load for Pulsed Current Characterization of Power Semiconductors. Fort Belvoir, VA: Defense Technical Information Center, September 2010. http://dx.doi.org/10.21236/ada531601.

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Federici, Justine, and Larry L. Lesher. Current and Future Load Bearing Equipment of the United States Marines: An Online Survey. Fort Belvoir, VA: Defense Technical Information Center, July 2003. http://dx.doi.org/10.21236/ada416921.

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Ravazdezh, Faezeh, Julio A. Ramirez, and Ghadir Haikal. Improved Live Load Distribution Factors for Use in Load Rating of Older Slab and T-Beam Reinforced Concrete Bridges. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317303.

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This report describes a methodology for demand estimate through the improvement of load distribution factors in reinforced concrete flat-slab and T-beam bridges. The proposed distribution factors are supported on three-dimensional (3D) Finite Element (FE) analysis tools. The Conventional Load Rating (CLR) method currently in use by INDOT relies on a two-dimensional (2D) analysis based on beam theory. This approach may overestimate bridge demand as the result of neglecting the presence of parapets and sidewalks present in these bridges. The 3D behavior of a bridge and its response could be better modeled through a 3D computational model by including the participation of all elements. This research aims to investigate the potential effect of railings, parapets, sidewalks, and end-diaphragms on demand evaluation for purposes of rating reinforced concrete flat-slab and T-beam bridges using 3D finite element analysis. The project goal is to improve the current lateral load distribution factor by addressing the limitations resulting from the 2D analysis and ignoring the contribution of non-structural components. Through a parametric study of the slab and T-beam bridges in Indiana, the impact of selected parameters on demand estimates was estimated, and modifications to the current load distribution factors in AASHTO were proposed.

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Kusiak, Chris, Mark D. Bowman, and Arun Prakash. Legal and Permit Loads Evaluation for Indiana Bridges. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317267.

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According to federal law, routine commercial vehicles must adhere to certain limits on their load configuration in order to operate legally on interstate highways. However, states may allow for heavier or different load configurations provided that bridges on the state and county highway system are load rated and, if necessary, posted with vehicles that appropriately represent these loads. The state of Indiana allows several classes of vehicles to operate with loads that exceed federal limits, and, presently, several LFD design loads are used to represent these exceptions as state legal loads. This study evaluates the MBE rating loads for their ability to encompass Indiana’s exception vehicles and recommends a set of state rating loads which can replace the current state legal loads and, combined with the MBE rating loads, satisfactorily encompass the load effects due to these exceptions. Comparing moment and shear envelopes on a representative set of bridges, the MBE rating vehicles were found to be insufficient for representing Indiana’s exception vehicles. Three new rating loads are proposed which encompass the exception vehicles efficiently and represent realistic legal loads. Conversely, acceptable HS-20 rating factors are also provided as an alternative to the adoption of these new vehicles. These rating factors, all 1.0 or greater, can ensure a similar level of safety by requiring a specific amount of excess capacity for the HS-20 design load.

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Mock, Raymond Cecil, Thomas J. Nash, and Thomas W. L. Sanford. Current scaling of axially radiated power in dynamic hohlraums and dynamic hohlraum load design for ZR. Office of Scientific and Technical Information (OSTI), March 2007. http://dx.doi.org/10.2172/901969.

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Weller, G. H. Review of current Southern California edison load management programs and proposal for a new market-driven, mass-market, demand-response program. Office of Scientific and Technical Information (OSTI), January 2002. http://dx.doi.org/10.2172/822264.

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Trim, M., Matthew Murray, and C. Crane. Modernization and structural evaluation of the improved Overhead Cable System. Engineer Research and Development Center (U.S.), March 2021. http://dx.doi.org/10.21079/11681/40025.

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A modernized Overhead Cable System prototype for a 689 ft (210 m) Improved Ribbon Bridge crossing was designed, assembled, and structurally tested. Two independent structural tests were executed, i.e., a component-level compression test of the BSS tower was performed to determine its load capacity and failure mode; and a system-level ‘dry’ test of the improved OCS prototype was conducted to determine the limit state and failure mode of the entire OCS. In the component-level compression test of the BSS tower, the compressive capacity was determined to be 102 kips, and the failure mode was localized buckling in the legs of the tower section. During system-level testing, the prototype performed well up to 40.5 kips of simulated drag load, which corresponds to a uniformly distributed current velocity of 10.7 ft/s. If a more realistic, less conservative parabolic velocity distribution is assumed instead, the drag load for an 11 ft/s current is 21.1 kips. Under this assumption, the improved OCS prototype has a factor of safety of 1.9, based on a 689-ft crossing and 11-ft/s current. The OCS failed when one of the tower guy wires pulled out of the ground, causing the tower to overturn.

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Bao, Jieyi, Xiaoqiang Hu, Cheng Peng, Yi Jiang, Shuo Li, and Tommy Nantung. Truck Traffic and Load Spectra of Indiana Roadways for the Mechanistic-Empirical Pavement Design Guide. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317227.

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The Mechanistic-Empirical Pavement Design Guide (MEPDG) has been employed for pavement design by the Indiana Department of Transportation (INDOT) since 2009 and has generated efficient pavement designs with a lower cost. It has been demonstrated that the success of MEPDG implementation depends largely on a high level of accuracy associated with the information supplied as design inputs. Vehicular traffic loading is one of the key factors that may cause not only pavement structural failures, such as fatigue cracking and rutting, but also functional surface distresses, including friction and smoothness. In particular, truck load spectra play a critical role in all aspects of the pavement structure design. Inaccurate traffic information will yield an incorrect estimate of pavement thickness, which can either make the pavement fail prematurely in the case of under-designed thickness or increase construction cost in the case of over-designed thickness. The primary objective of this study was to update the traffic design input module, and thus to improve the current INDOT pavement design procedures. Efforts were made to reclassify truck traffic categories to accurately account for the specific axle load spectra on two-lane roads with low truck traffic and interstate routes with very high truck traffic. The traffic input module was updated with the most recent data to better reflect the axle load spectra for pavement design. Vehicle platoons were analyzed to better understand the truck traffic characteristics. The unclassified vehicles by traffic recording devices were examined and analyzed to identify possible causes of the inaccurate data collection. Bus traffic in the Indiana urban areas was investigated to provide additional information for highway engineers with respect to city streets as well as highway sections passing through urban areas. New equivalent single axle load (ESAL) values were determined based on the updated traffic data. In addition, a truck traffic data repository and visualization model and a TABLEAU interactive visualization dashboard model were developed for easy access, view, storage, and analysis of MEPDG related traffic data.

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Thorne, Colin, Oliver Harmar, Chester Wason, Nick Clifford, Richard Measures, and David Biedenharn. Current and Historical Sediment Loads in the Lower Mississippi River. Fort Belvoir, VA: Defense Technical Information Center, August 2007. http://dx.doi.org/10.21236/ada471387.

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