Modelování a simulace výkonových poměrů pohonu s asynchronním motorem napájeným z nepřímého měniče kmitočtu

Abstract

The objective of this thesis is to present the status of the issue of power relations of a drive with asynchronous engine supplied from an indirect frequency converter with voltage semi-circuit on the basis of the processing and creation of mathematical models and the respective simulations. Individual models were designed within the mentioned drive in two parts. First of all, without consideration of losses, and then after the implementation of the respective mathematical apparatus and simulation blocks with the completion of the respective losses both for the asynchronous engine with short-circuit armature, as well as for the indirect frequency converter. However, other simplifying preconditions were not respected and applied. For the resolution of models and simulations, selected type of asynchronous engines with short-circuit armature and the respective indirect frequency converter with voltage semi-circuit were used. Simulation models were constructed in the adds part of Matlab-Simulink software, version 7.8.0, by means of blocks available in the integrated Simulink library with the support of m-file created in the Matlab module. On the created simulation models, the necessary functions of dependence for individual components of the drive were gradually simulated and completed with the created simulation blocks of losses. This verifies the correct creation and the processing of individual mathematical and simulation methods of the asynchronous engine, indirect frequency converter and blocks representing the respective losses. At the same time, results were verified concerning the power relations of the stated constructed drive with the possibility of their comparison with drives with asynchronous engine supplied by indirect frequency converter which are implemented in the practice.