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 8 of 8 for “"double frequency"”.
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Double-frequency stator core vibration in large two-pole turbogenerators
… the variation with load and excitation of double-frequency stator core vibration in large two-pole turbogenerators. The model has a dual purpose, serving first to investigate causes of this effect; secondly to provide predictions suitable for an on-line monitoring …
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Inverter design and analysis using multiple reference frame theory
… power point tracker (MPPT) in this manner, frequency transfer properties can be preserved and harmonics throughout the system can be predicted. A state space model taking into account the dc and fundamental grid frequency is presented and used to optimize the controller gains of the system. …
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Reliability analysis of single-phase photovoltaic inverters with reactive power support
… required in the dc link in order to produce the double-frequency power ripple. The overall current rating of the MOSFETs and output filter must also be sized to accommodate the current for the apparent power output. Modeling of the inverter verifies the conditions for each of the components under …
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On the Rayleigh -Brillouin scattering in air
… can be measured. Its transmitter is a double-frequency Nd-YAG laser at 532nm. Most of the data used in this research were taken on 31 July 2002.</p><p>A widely used mathematic model---the S6 model---is fitted to the measured RBS spectra. The discrepancies between the measured …
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Multi-defect localization and evaluation techniques for distribution cables based on time-domain reflectometry
… and multiple-joint cables. Based on the frequency-dependent distributed parameter model of the cable body, a transmission line model was established to accurately represent the propagation characteristics. Furthermore, for different types of defects, equivalent circuit models and …
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Microtremor recordings in Northern Mississippi: Evaluating site effect and correlating with wave climate
… using a LE-3D/20s seismometer with Eigen-frequency of 0.05Hz and RefTek 130-01/3 data logger with a sampling rate of 100Hz. With these recordings, the horizontal to vertical spectral ratio (HVSR) method is applied to find the predominant frequency (f0) and roughly estimate amplification …
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Bi-Directional AC-DC Converters for Electric Vehicles
… on-board EV battery chargers, is the low frequency power ripple that reflected in the DC-side. This double frequency ripple causes extra heat and reduces the life span of the battery. Another issue is the reliability reduction due to the use of unreliable electrolytic capacitors. This …
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Control of a Single-Phase Grid-Connected Voltage Source Inverter with LCL Filter
… sensing technique, which effectively removes the double frequency ripple from the DC-bus voltage signal and prevents it from propagating into the current control loop. A variant on the DC-bus voltage droop control method, called adaptive droop control is proposed, which adaptively changes the …