Global ETD Search
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Showing 1 to 20 of 129 for “"power losses"”.
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Power losses in massive, solid, saturable iron
The results of the representative calculation, tabulated in Table 2, are plotted in Figure 28. Inspection of Figure 28 reveals that without saturation the magnetic intensity decays quite rapidly as we move into the iron. The rate of decay becomes slower as saturation is introduced, and slower still …
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An Experimental Investigation of Churning Power Losses of a Gearbox
In this study, load-independent (spin) power losses of a gearbox operating under dip-lubrication conditions are investigated experimentally. A family of final drive helical gear pairs from an automotive transmission is considered as the example for this investigation. A dedicated gearbox is …
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Determination of the power losses on a tyre-mounted ore-grinding mill
The objective of this study was to determine the power losses occurring on a tyre-mounted ore-grinding mill designed by Dorbyl Heavy Engineering for Mintek. In order to understand the type of losses occurring on this mill it was decided that a scaled model be built and tested. Such a model mill was …
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Prediction of the power losses of PWM inverter drives for permanent magnet synchronous motors
A model is developed for predicting power losses for a hard-switching threephase IGBT inverter drive for synchronous motor applications. For a given set of motor parameters, semiconductor device parameters and motor operating conditions, the various losses and the temperature rises of semiconductor …
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Using Reanalysis Data For The Prediction Of Seasonal Wind Turbine Power Losses Due To Icing
… in winter months capturing this potential power is severely impacted by the meteorological conditions, in the form of icing. Predicting the expected loss in power production due to icing is a valuable parameter that can be used in wind turbine operations, determination of wind turbine site …
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Optimal allocation of distributed generation for power loss reduction and voltage profile improvement
… of DG integration by optimal allocation in a power system network. These benefits include electrical power losses reduction and voltage profile improvement. Optimal DG location and sizing in a power system distribution network with the aim of reducing system power losses and improving the …
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Reduction of energy losses: a key to improved rock drilling?
The viscous power losses of a rotary-vibratory drilling system are estimated in this study. Rotational and pure vibratory losses are considered separately. This analysis indicates that considerable power is dissipated into the drilling fluid. Pure vibratory power losses of over 3,728 W (5 hp) are …
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Optimal placement of battery energy storage system for voltage profile improvement and power loss reduction
… total system costs associated with active power losses and voltage profile deviations. The methodology employs a dual-software approach, utilizing MATLAB for optimization algorithms and DigSilent PowerFactory for load flow analyses. Initial assessments establish a baseline scenario without …
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Pareto optimality based zonal allocation of distributed energy resources considering technical and economic constraints
… to minimize DER installation costs, reduce power losses and enhance the voltage profile of the network. The proposed optimization algorithm is evaluated using the IEEE 123-bus test system through a co-simulation between MATLAB and OpenDSS. The results illustrate that the proposed approach …
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Harmonic propagation studies in offshore wind power clusters
… to optimise the electrical network and reduce power losses. As this issue represents a combinational problem, the larger electrical systems present more complexity - the reason why this problem remains unsolved. This research aims to develop an algorithm that suggests a set of configurations in …
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Synthesis and characterization of magnetic nanorings for neuronal stimulation
… both colloidal stability and large hysteretic power losses when exposed to an alternating magnetic field (AMF). Coupled with the biocompatibility of polymer surface coatings, MNRs have the potential of being used for many biological applications, including neuronal stimulation, drug delivery, …
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Reconfiguration of distribution systems to reduce power loss using ant Colony Optimization and Simulated Annealing
… the optimal reconfiguration to minimize power losses of the test grid, the CIGRE network, and a grid owned by the Reykjavik area utility company Veitur, called A3-A5. It is implemented in Python, where the grid's data is obtained and processed with Pandapower, a software-based on python …
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An Investigation of Fundamental Frequency Limitations for HF/VHF Power Conversion
The volume reduction in power converters over the past several decades can chiefly be attributed to increases in switching frequency. It is to be expected that the trends towards miniaturization will maintain steady pressure to keep this pace of increasing switching frequencies of power converters. …
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Power System Control with Distributed Flexible AC Transmission System Devices
… devices offer many potential benefits to power systems. This work examines the impact of installing D-FACTS devices by studying the sensitivities of power system quantities such as voltage magnitude, voltage angle, bus power injections, line power flows, and real power losses with respect …
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Reactive power support capability of flyback microinverter with pseudo-dc link
… been used for injecting only active power in to the power distribution network. In this thesis, a new approach will be proposed to control the micro-inverter to supply reactive power to the grid which is important for grid voltage support. Circuit models and mathematical analyses are …
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Design of a gas force simulator for the MIT Electromechanical Valve Drive project
… in the engine cylinder. This gas force causes power losses in the EMVD. A gas force simulator has been designed to simulate the pressure acting against the exhaust valve in the engine cylinder. This allows the power loss as a result of the gas force to be measured for the EMVD.
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Multi-purpose applications of energy storage systems in a power system network
… (during contingency events), reduction of real power losses, and mitigation of voltage deviations using the deep sleep optimizer (DSO) algorithm was developed. The proposed method establishes a relationship between frequency nadir, voltage variations, power losses, and the BESS multiplier by …
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Allocation of transmission losses to determine tariff
… and be responsible for its own contribution to losses in the system. The allocation of transmission losses has become an important issue as this determines how and what to charge each of the participants in the industry. This allocation is best assessed and based on their individual …
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Design and Multi-physical Fields Analysis of High Speed Permanent Magnet Machines
Due to the advantages of high power density, high efficiency and compact size, high speed permanent magnet machines (HSPMMs) have found wide application in industrial areas. Compared with a conventional speed permanent magnet machine, a HSPMM rotor can reach speeds of more than 10,000 rpm, which …
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Smart management strategies of utility-scale energy storage systems in power networks
Power systems are presently experiencing a period of rapid change driven by various interrelated issues, e.g., integration of renewables, demand management, power congestion, power quality requirements, and frequency regulation. Although the deployment of Energy Storage Systems (ESSs) has been …
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