Abstract
In this study, the power spectrum of the random PWM technique using the Linear Congruential Generator (LCG) and the PWM technique with chaotic logistic, tent and double tent map characteristics were compared with the fixed frequency switching PWM technique. The random technique generates random numbers using LCG, and the chaos number is generated using each chaos map, and a bifurcation tree with a=4.0 and λ=0.99 conditions in which a complete chaos state exists in the ranges of 0 and 1 is used. In order to prove the validity of this study, a DSP-based power electronics converter for driving a three-phase induction motor was manufactured. As a result, the chaos logistic map and tent map were limited in the spread of broadband in the spectrum of power electronics converters. However, the advanced chaos double tent map was similar to the excellent spectrum spread performance of the Random PWM technique by LCG. Harmonic Spread Factor(HSF) of the output voltages of each technique were measured according to the increase in the modulation index, and the chaos double tent map and random technique were very advantageous from the viewpoint of HSF.
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