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 24 for “"Active Filter"”.
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Active filter current compensation for transmission optimisation
… currents are found, these can be obtained by active and passive devices to inject a specific amount of power (positive and negative) as to compensate existing currents. The focus is particularly on the proof of concept by simulations and physical experiments with work not specifically …
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Active filter techniques for reducing EMI filter capacitance
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Simulation of voltage source converter based shunt active filter in EMTP‐RV
… linear loads has sparked a new interest in the filtering techniques used in transmission and distribution systems. Unlike passive filters, active filters are adaptable to rapidly changing source impedance and provide the necessary harmonic compensation for varying non-linear loads. This thesis …
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EMTP simulation of an active filter operating with weak AC distribution system
… harmonic load currents. Traditionally passive filters are used for filtering these load harmonics. Recent technological advances have enabled the use of high frequency switching devices in the development of active filtering techniques. In this thesis, an active filter topology was selected for …
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Voltage Balancing Techniques for Flying Capacitors Used in Soft-Switching Multilevel Active Power Filters
… capacitors used in soft-switching multilevel active power filters. The proposed active filter has proved to be a solution for power system harmonics produced by static high power converters. However, voltage unbalance of the clamping capacitors in the active filter in practical applications …
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Design of feedforward active ripple filters for power converters
An active ripple filter is an electronic circuit which cancels or suppresses the ripple current and EMI generated by the power stage of a power converter, thus reducing the passive filtration requirements. This thesis presents the design and evaluation of various current sensing and injection …
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Design and implementation of a single phase active power filter
Various active filter solutions have been proposed in recent years {I], {2], and are still being widely investigated today. This thesis discusses the design and implementation of the shunt AP F topology.
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Impact and Utilization of Emerging PHEV in Smart Power Systems
… of this thesis is the design of virtual active filter for power system using V2G technology. Nonlinear loads, inverters and converters absorb reactive power from the connected bus. Compensation of reactive power is essential in power system. In this thesis the Vehicle to Grid (V2G) …
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A study of high-K dielectric materials in conjunction with a multilayer thick-film system
… in second-order lowpass and bandpass RC active filter circuits. The materials were electrically characterized in terms of the variation of dielectric constant and dissipation factor with frequency. The performance of the filter circuit is related to the characteristics of the dielectric …
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Design and implementation of three-phase four-wire active filters
… as are found in standards such IEEE-519. Passive filters have been used to limit the flow of harmonic currents in distribution systems. However, these tend to be bulky and the design is complex, particularly if the number of harmonic components to be reduced increases. With improvements in power …
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INDOOR COARSE PARTICULATE MATTER: EVALUATING EXPOSURES AND HEALTH EFFECTS IN ASTHMATIC CHILDREN
… and potential for regulatory status. A novel filterbased sampler (coarse particle environmental monitor, CPEM) was used to characterize coarse fraction and airborne endotoxin concentrations in a subset of ARTIS homes. In 50 homes, only the presence of pets was associated with PMc …
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INDOOR COARSE PARTICULATE MATTER: EVALUATING EXPOSURES AND HEALTH EFFECTS IN ASTHMATIC CHILDREN
… and potential for regulatory status. A novel filterbased sampler (coarse particle environmental monitor, CPEM) was used to characterize coarse fraction and airborne endotoxin concentrations in a subset of ARTIS homes. In 50 homes, only the presence of pets was associated with PMc …
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Design of Integrated, Low Power, Radio Receivers in BiCMOS Technologies
… for the realization of RF and IF bandpass filtering. Although considerable research has been directed at developing suitable switched-capacitor and Gm-C based replacements for these filters, the resulting designs have yet to see substantial commercial application. A critical problem faced …
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A microfabricated dielectrophoretic micro-organism concentrator
… in solution conductivity. The concentrator is an active filter, which concentrate bacteria in solution using negative dielectrophoresis, which pushes objects away from the electrodes toward field minima. An electric field barrier is set up to guide cells toward a concentrated outlet flow path …
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A study of phase advance networks for A.C. control system stabilisation
… frequency characterlston is discussed; The filter is considered from a pole-zero aporoach and the limitations and effects caused by temnerature, component tolerances and carrier frequency drift are considered in detail. In chapter 3 an active filter that will produce a symmetrical response …
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Three-phase power conversion using soft-switching PWM techniques
… converter topologies 2. Design of input EMI filters for three-phase converters 3. Design of microprocessor controllers for three-phase converters. An analysis of existing soft-switching PWM techniques is performed, and two generalized soft-switching PWM converter circuit representations are …
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Hybrid Active Power Filter with Output Impedance Control
… passive devices are almost always preferable to active solutions due to their lower losses, these technologies hold great promise, though they are inherently limited in small-footprint applications. A second category is the addition of active devices, which involves the use of some filtering …
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Design and Analysis of a Grid Connected Photovoltaic Generation System with Active Filtering Function
… subsystem to also provide harmonic and reactive compensation. When the sun is unavailable for generation, the system hardware can still be utilized to correct for harmonic and reactive currents on the distribution system. This system's dual-purpose operation solves both the power …
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Ac-dc Bus-interface Bi-directional Converters in Renewable Energy Systems
… is improved. A set of ac passive plus active filter solutions is proposed for the ac-dc bus-interface converter which significantly reduces the total power filter volume but still eliminate the total leakage current and the common-mode conducted EMI noises by more than 90%. The dc-side …
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Integrated Tunable LC Higher-Order Microwave Filters for Interference Mitigation
… in the increasingly hostile RF environment, filtering becomes a bottleneck for SDRs as the traditional off-chip filters are fixed frequency and bulky. Therefore, tunable filtering is a critical building block for the reconfigurable RF front-ends and on-chip implementations are needed to meet …
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