Simulation of the impact of higher harmonics on the transient process of induction machine fed from PWM inverters

Abstract

Preliminary communicationIn this paper a fundamental mathematical model (algorithm) for determination of condition of induction machine as well as the simulation procedure for measurement of certain values in program MATLAB has been presented. A scheme of measuring system and results of simulation application are presented on output lists. Thus, measuring system gradually develops and improves as combination of information and results of previous steps in modeling with new elements essential for development of researches when induction machine is fed through PWM inverter. Keywords: algorithm; induction machine; inverter; measurement; simulation Simuliranje utjecaja viših harmonika na prijelazni proces indukcionog stroja napajanog iz PWM inverteraPrethodno priopćenje U radu je prikazan osnovni matematički model (algoritam) za određivanje stanja indukcionog stroja kao i postupak simulacije mjerenja pojedinih vrijednosti u programu MATLAB. Na izlaznim listama prikazana je shema mjernog sustava i rezultati primjene simulacije. Na taj način se mjerni sustav postupno razvija i usavršava kao kombinacija informacija i rezultata prethodnih koraka u modeliranju s novim elementima značajnim za razvoj dijagnostičkog sustava kada se indukcioni stroj napaja pomoću PWMinvertera.

A study of electrothermomechanical converter for technological purposes with nonlinear changes in the loading and cooling medium

“…The graphical representation of dependencies ( 10), (13), and ( 16) is shown in Figure 7. As can be seen from the relation ( 16) and Figure 7, a transient process is observed in the initial time, followed by a sinusoidal change in the rotor temperature, which, in turn, causes pulsations in the specific active resistance ρ and magnetic permeability μ of the rotor material.…”

“…The modifications of electromechanical converters for technological purposes proposed in this study provide regulation of heat and mass transfer due to the two-way supply of thermal energy to raw materials and the ability to directly influence the technological process through the parameters and characteristics of the electromagnetic system. At the same time, a mathematical model (algorithm) can be introduced to determine the state of the induction machine, as well as a modelling procedure for measuring certain values in MATLAB, which is presented in N. Marković et al (2017). The measurement process in the system is gradually developing and improving as a combination of information and results of previous modelling steps with new elements, for example, when the stator windings of the motor and braking modules of the electromechanical converter are powered by a frequency converter, respectively.…”

The Influence of Magnetic Hysteresis in Magnetic Circuit Sheets on Transient Processes in Electrical Machines

“…In the works of Match [12] and Chapman [13], normal stationary states with one frequency and classical transformer parameters are analyzed. In the available literature, in addition to the basic ones, higher harmonics are also taken into account in the analysis of normal and transient states [14][15].…”