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 518 for “"harmonics"”.
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Feeder reconfiguration on distribution network considering harmonics
… proportion have considered the concept of system harmonics in feeder reconfiguration. In recent years, an increasing number of invertor/converter-based renewable generators are being connected to the distribution network, and given that these generators are harmonic sources, it is important to …
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Control of Harmonics in 6-Pulse Rectifiers
<p>Harmonics are always present in electrical power systems. Harmonic distortion is harmless as long as its level is within the limit. However, with the recent rapid advancement of power electronics, i.e. non linear loads, the use of the variable speed drives are increasing day by day. Harmonics …
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Analysis of time-varying harmonics in electrical distribution systems
This thesis analyzes the time-varying nature of fundamental and harmonic signals in electric power distribution systems. Measurements show that signal variations are neither completely deterministic nor random. As a consequence the deterministic and random parts are analyzed separately. Two methods …
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Non-Symmetrized Hyperspherical Harmonics Method Applied to Light Hypernuclei
… extension of the Non-Symmetrized Hyperspherical Harmonics method in order to treat quantum systems with different species of particles and additional degrees of freedom, like particle mixing. The aim is to introduce it as a new tool in the ab-initio study of light hypernuclei, and, more in …
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Timing Diagnostics and Coherent Harmonics from a test-FEL
… by a femtosecond laser at 263 nm and coherent harmonics were extracted in an APPLE-II type elliptical undulator. A thermionic gun with a barium oxide cathode was adapted for photocathode operation, and the performance of the gun was tested. Measurements showed the production of 200 pC of …
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Extreme Ultraviolet Polarimetry with Laser-Generated High-Order Harmonics
… which employs laser-generated high-order harmonics as the light source. This relatively high-flux directional EUV source has available wavelengths between 8 nm and 62 nm and easily rotatable linear polarization. The polarimeter will aid researchers at BYU in characterizing EUV thin films …
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Extreme ultraviolet polarization optics for polarimetry of structured high harmonics
… combined with similar characterization of the harmonics can reveal insights into the HHG process. This thesis outlines steps to adapt Stokes polarimetry to perform measurements on EUV, allowing the characterization of novel generation schemes.
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Optical modulation of harmonics in PIN photodiodes for antenna applications
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01
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Relating skewness and Fourier harmonics in low Reynolds number wake flow
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-05-01
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Analysis of symmetrical components of harmonics for three phase power systems
… systems. This method was extended to various harmonics. The aim of this thesis is to measure both the magnitude and phase angles of various harmonics which exist in three phase power systems, and to express them in symmetrical components. A digital electronics and microprocessor-based …
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A series-connected VSC for voltage regulation, balancing and harmonics mitigation
… such as voltage dips, swells, unbalances and harmonics. The effect of these disturbances may be as bad as a complete shut down of a production line, hence giving rise to the growing interest and need, for mitigation of such power quality problems. The objective of this thesis is to design and …
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Poisson Distribution based algorithm to reduce grid harmonics caused by EV chargers
… algorithm is proposed to reduce the grid harmonics caused by EVs which are essentially non-linear loads. The proposed algorithm helps reduce grid harmonics by phase-shifting the carrier waves of each charging bay within a charging station. When the carrier waves are phase-shifted, the …
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Using Intrinsic 3rd Harmonics for Large Synchronous Generator Insulation Fault Condition Monitoring
… stator insulation faults using intrinsic third harmonics. Based on two-port network theory, a mathematical model is derived and presented in this thesis. Data from offline experiments has been analyzed to verify the technique’s effectiveness. Additionally, online data collected from several …
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Optimal capacitor placement to minimise harmonics in power systems and software tools
Harmonics in power systems is a relatively new area of research. In view of this and the growing awareness of the quality of the electricity supply, the theory of harmonics in power systems is reviewed. The sources and the effects of harmonics are investigated. The algorithms that are used for the …
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Impact of System Impedance on Harmonics Produced by Variable Frequency Drives (VFDs)
… the likelihood of equipment failure due to harmonics. The full extent of the impact, however, is typically unknown until an extensive harmonic analysis is performed or the system is installed and tested. This thesis evaluates the impact that source impedance has on the harmonic voltage …
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Determination of Harmonics for Modeling Integration of Solar Generation to The Electric Grid
… grid .The model is then used in determining Harmonics of Integrating solar panels to the electric grid that are based on parallel or series combination of solar cells. To study integration of solar generation to the grid, we have used solar series and solar parallel models in EMTP (Electro …
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Phase-Matching Optimization of Laser High-Order Harmonics Generated in a Gas Cell
… A semi-infinite cell geometry produces brighter harmonics than cells of sub-centimeter length. In the semi-infinite geometry, the gas occupies the region from the focusing lens to a thin exit foil near the laser focus. Counter-propagating light is used to directly probe where the high harmonics …
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Fast multipole acceleration of periodic Green's function using spherical harmonics and Ewald summation
In this thesis, we present a fast multipole algorithm (FMA) for solving a periodic scattering problem using method of moments (MOM). The difference between the standard integral equations (EFIE and MFIE) and the ones used for periodic geometry is the use of periodic Green's function (PGF) over …
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Design of shunt active power filter to mitigate the harmonics caused by nonlinear loads
… (SAPF) by using p-q theory to mitigate the harmonics which are created by nonlinear loads. To obtain result for this paper, the MATLAB / Simulink was used as a simulation tool. The achieved results are within the recommended IEEE-519 standard i.e. less than 5% and also the power factor (PF) …
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Clestial harmonics - Applications of Angular Power Spectra to Problems in Astroparticle and Cosmological Physics
The overarching topic of this thesis is the use of angular power spectra formalisms in the spherical harmonic space, aimed at inferring information on observables relevant to astroparticle physics and cosmology applications. Part I describes the work I developed at the University of Turin under the …
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