1,721,104 research outputs found
Some notes on wavelet analysis of time-variant electrical networks
No full textAfter presenting a new approach for the analysis and the resolution of linear time-variant circuits, based on wavelet functions, the authors introduce some specific considerations related to matrix properties associated with such methodology. The simple recursive algorithm for the construction of the integral and convolution matrices and the topological matrix are evaluated in depth in order to bring out the most interesting features. Proposals for numerical optimizations are also given. An example including a three-phase inverter studied using such a technique is presente
Direct Haar-space control for DC Motors
No full textAfter considering the analysis of a three-phase inverter driving induction motors for railway applications, the authors take into consideration the system formed by a DC motor fed by a chopper. The mathematical analysis has been conducted through Haar functions, a tool based on the general framework of wavelets. The spec advantage consists in being able to solve differential equations by approaching the problem in the Haar domain, instead of adopting a time domain solution. A limited number of Haar coefficients are necessary to perform this task. Especially transient conditions during the starting process can usefully be examined in such a way, putting into evidence specific characteristics of the chopper motor system. An example describing the application of such technique is presented and critically describe
Haar state equations for power electronics sysetm modelling
No full textThe authors extend to this work some considerations on the Haar analysis of switching circuits introduced in previous papers. Specific properties related to matrices associated with the analysis and the resolution of linear time-variant circuits, have been used to perform such study and define transient behavior for the line current of a power electronic device. The simple recursive algorithm for the construction of the integral and convolution matrices and the topological matrix has been applied to evaluated more in depth the most interesting features of the system. The example describing the application of such technique to a three-phase inverter provides also significant starting points for future researc
Wavelets analysis for the fast integration and derivation of a class of signals related to control systems
No full text- …
