Sökning: "harmonics analysis"
Visar resultat 1 - 5 av 62 avhandlingar innehållade orden harmonics analysis.
1. Dynamic Analysis of Harmonics in Electrical Systems
Sammanfattning : Frequency domain analysis and design of power systems is complicated in the presence of harmonics, switching dynamics, nonlinearities, unbalances, and for systems with mixed ac/dc dynamics. The reason is that linearization of the system does not lead to a time invariant system, but a system with periodically time varying dynamics, which implies that there is coupling between different frequencies. LÄS MER
2. A precision wattmeter for non-sinusoidal conditions : based on an analysis of common measuring problems due to harmonics
Sammanfattning : .... LÄS MER
3. Towards Intelligent Power-System Monitoring: Segmentation, Feature Extraction, and Identification of Underlying Causes
Sammanfattning : The increase in size of modern power systems together with the concept smart grid requires advanced monitoring to ensure system availability, reliability, and power quality. The huge amount of available data no longer permits analysis to be implemented manually and centrally. LÄS MER
4. Modeling and Analysis of the Interaction of Batteries and Power Electronic Converters
Sammanfattning : This thesis deals with the interaction of batteries and power electronic converters in automotive applications. Even if the additional heating caused by (unwanted) alternating currents is disregarded, there has been a concern that alternating currents can be harmful for batteries. LÄS MER
5. Theoretical and computational advances in small-angle x-ray scattering tensor tomography
Sammanfattning : The relationships between microscopic and macroscopic structures is a central topic of materials physics. Small-angle x-ray scattering (SAXS) is a powerful experimental technique for probing and mapping variations in electron density, given by the reciprocal space map, down to the nanometer scale in two dimensions. LÄS MER