Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"unbalanced load"”.
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High Performance Power Converter Systems for Nonlinear and Unbalanced Load/Source
… levels of issues and solutions dealing with unbalanced and/or nonlinear situations in power electronic systems, namely power converter level, power converter system level, and large-scale power electronics system level. At power converter level, after review of traditional PWM methods, …
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Design and implementation of a 500 kVAr hybrid power factor
… wye connected capacitors exist for a particular unbalanced load that result in a reduction of unbalance (given enough load inductiance). Simulation of the proposed compensator topology allowed for the verification of this and and appropriate control strategy could be developed. Simulations also …
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Analysis and Comparison of Space Vector Modulation Schemes for Three-Leg and Four-Leg Voltage Source Inverters
… entire range of modulation index and for varying load power factors (leading and lagging) under both balanced and unbalanced load conditions. The analysis shows that the performance of four-leg inverters is similar to three-leg inverters for various space vector modulation schemes. The analysis …
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The use of biomass for electric power generation in the South African and Zimbabwean saw-milling industry
… for the kilning process. Due to the situation of unbalanced load that persists at nearly all the saw-mills, there is a surplus of power that is often difficult to dispose of economically.
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P-resonant control for the neutral point of three phase inverter
… so that the inverter can be connected to an unbalanced load. The controller, designed by using the Proportional resonant control techniques, which attain eliminate for the current flowing through the split capacitors. This leads to very small variation of the neutral point from the mid-point …
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COMMON MODE VOLTAGE ELIMINATION IN THREE-PHASE FOUR-LEG INVERTERS UTILIZING PULSE DENSITY MODULATION
… experimental results demonstrate that both the unbalanced load requirements in MIL-STD-1399 and the conducted emission limits in MIL-STD-461G are met with the proposed controller, while the grid-following converter supplies a desired current to the load.
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Electrical Distribution Modeling:An Integration of Engineering Analysis and Geographic Information Systems
… modeled separately, both in software capable of unbalanced load-flow and in an industry-standard GIS environment. Both tools utilized were commercially available, off-the shelf products indicative of those used in academia and in basic GIS installations. The foundational data necessary to build …
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Four-Output Isolated Power Supply for the Application of IGBT Gate Drive
… which relates the drop of output voltage to the load current. Then, the effects of the dc blocking capacitor for the unbalanced load condition and unbalanced duty cycle are tackled. The theoretical results are compared with the experimental results and the simulation results to verify the …
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Effects Of Bedding Void On Internal Moment Increase In Concrete Pipes
… joint under the weight of the soil and traffic loading above the pipe, making it the most probable location where a gap in the joint would form. This would cause the origination of a small void under the pipe, which creates pressure redistribution in the subgrade reaction under the pipe. As the …
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Nonlinear time-dependent analysis of externally/internally prestressed reinforced concrete beams
… of these structures through their service load history as well as throughout the elastic, inelastic, and ultimate load ranges. Sections can change throughout the length of the member and the variation of the material properties within the element is accommodated. The section is divided into …
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Design and implementation of three-phase four-wire active filters
… are used. Furthermore, if the three phase load is unbalanced, neutral currents flow and the three phase three-wire active filter cannot adequately eliminate harmonics. This thesis deals with active filters for the general case of three phase four-wire systems. The proposed filter uses three …
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Load balancing in heterogeneous wireless communications networks. Optimized load aware vertical handovers in satellite-terrestrial hybrid networks incorporating IEEE 802.21 media independent handover and cognitive algorithms.
… WLAN would be underutilised, thereby creating an unbalanced load across these different wireless networks. This high variation among the load across different co-located networks may cause congestion on overloaded network leading to high call blocking and call dropping probabilities. This can be …
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An experimental study of monolithic scheduler architecture in cloud computing systems
… a 6000 node emulated cluster over realistic workload. We conclude that scheduling algorithms should embrace randomness in order to beat resource contention. We infer that scheduling in the monolithic architecture is a network I/O intensive process. We calculate the optimal value of design …
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Phase control of delta-connected single-phase grid-forming inverters for auxiliary signal injection
… to benchmark the behavior of the LQI controller. Unbalanced operation is also desirable when supplying an unbalanced load or injecting auxiliary signals for fault detection. Both MATLAB and Controller Hardware in-the-loop (C-HIL) are used to validate the proposed controllers and demonstrate …
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Nonlinear transient and steady state analysis for self-excited single-phase synchronous reluctance generator
… the prime mover speed, rather than by both the load and the prime mover speed as in an induction generator, so SERG can be easily integrated with power electronic devices to implement a control scheme.;Most of the current analyses deal with three-phase reluctance generators, but insufficient …
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Modeling, Analysis, and Design of Distributed Power Electronics System Based on Building Block Concept
… by the interleaved discontinuous SVM, (2) the load and source interactions caused by unbalanced load and small signal impedance overlap, and (3) the combined common mode noise caused by both front-end PWM rectifiers and load inverters. The interaction phenomena and mitigation methods are …
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Transmission grid strength analysis and operation of inverter-based microgrids
… control of grid-forming inverters supplying unbalanced loads is analyzed. The performance of a grid-forming inverter with voltage balancing capability is demonstrated by blackstarting an islanded microgrid with an unbalanced load and an induction motor. Simulation results showed that the …
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Allocation of transmission losses to determine tariff
… which arbitrarily allocates 50% each to the load and generator; the Marginal procedure allocation, which is either positive or negative; the Proportional sharing method which bases its allocation on the Kirchhoff’s current law and allocates no losses to the transmission line and the …
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Two-Stage Multi-Channel LED Driver with CLL Resonant Converter
… among LED strings is very good, even if the load is severely unbalanced. Meanwhile, the current flowing through the external inductance Lr1, instead of the magnetizing current is used to help the primary-side switches to achieve ZVS. Therefore, large magnetizing inductance is good for current …
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Control Applications and Economic Evaluations of Distributed Series Reactors in Unbalanced Electrical Transmission Systems
… transmission capacity utilization, alleviate overloads due to load growth and contingencies, and mitigate the effects of unbalanced voltages, unbalanced transmission line impedances and unbalanced loads by balancing flows in the phases of an unbalanced line. This dissertation provides several DSR …
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