Search for dissertations about: "active filter"

Showing result 1 - 5 of 107 swedish dissertations containing the words active filter.

2. 1. Modeling and Control of Voltage Source Converters Connected to the Grid

   Author : Michael Lindgren; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; voltage source converter; switching frequency; pulse width modulation; IGBT valve; power electronics; small-signal; L-filter; LCL-filter; transfer function; line filter; active filtering; frequency response; sampling frequency;

   Abstract : This thesis deals with the modeling and control of pulse width modulated (PWM) voltage source converters connected to the grid. When voltage source converters are connected to the grid, the power quality and the dynamic performance are affected by the line filter connected between the converter and the grid, and by nonlinearities caused by the switching converter. READ MORE

4. 2. Active Stabilization of Thermoacoustic Oscillation

   Author : Martin Ansbjerg Kjaer; Institutionen för reglerteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; subspace–based identification; fuel actuation; thermoacoustic instability; LQR; Active control;

   Abstract : Combustion processes serve as important sources of energy for both power generation and for transport, ranging from large scale power stations to micro turbines and aeroplane engines. Lean premixed combustion offers a potential to reduce the emission levels, but suffers from instability problems which can be overcome by the use of active control. READ MORE

5. 3. Estimation of Nonlinear Dynamic Systems : Theory and Applications

   Author : Thomas B. Schön; Fredrik Gustafsson; Simon Godsill; Linköpings universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nonlinear estimation; system identification; Kalman filter; particle filter; marginalized particle filter; expectation maximization; automotive applications; Automatic control; Reglerteknik;

   Abstract : This thesis deals with estimation of states and parameters in nonlinear and non-Gaussian dynamic systems. Sequential Monte Carlo methods are mainly used to this end. These methods rely on models of the underlying system, motivating some developments of the model concept. READ MORE

6. 4. Electrochromic Polymer Devices: Active-Matrix Displays and Switchable Polarizers

   Author : Peter Andersson; Magnus Berggren; Nathaniel Robinson; Per Bröms; Linköpings universitet; []
   Keywords : conjugated polymer; PEDOT:PSS; active-matrix; displays; polarizer; polyaniline; TECHNOLOGY; TEKNIKVETENSKAP;

   Abstract : Major efforts have been spent during recent years in worldwide attempts to achieve an electronic paper technology; the common name for novel flexible displays utilizing substrates such as paper, plastics or thin metal sheets. Various kinds of technology are available that potentially will be used for an electronic paper, which differs from each other mainly with respect to the choice of active materials, substrates and manufacturing techniques. READ MORE

7. 5. Reconfigurable Receiver Front-Ends for Advanced Telecommunication Technologies

   Author : Iman Ghotbi; Integrerade elektroniksystem; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; 5G; Receiver; Filter; Low-noise amplifier; FD-SOI; Calibration;

   Abstract : The exponential growth of converging technologies, including augmented reality, autonomous vehicles, machine-to-machine and machine-to-human interactions, biomedical and environmental sensory systems, and artificial intelligence, is driving the need for robust infrastructural systems capable of handling vast data volumes between end users and service providers. This demand has prompted a significant evolution in wireless communication, with 5G and subsequent generations requiring exponentially improved spectral and energy efficiency compared to their predecessors. READ MORE