Pulse width modulation technique parameter selection with harmonic injection and frequency- modulated triangular carrier

This study presents a very important feature of the technique of pulse width modulation (PWM) with injection of harmonic and triangular frequency carrier modulated in frequency. This technique is used to improve the quality of the output voltage signal of the power inverters controlled PWM. The purpose of this study is to show a new feature of controllability by the selection of different parameters. This allows multiple responses, from the point of view of the spectrum and the properties of the signal quality, with the same number of pulses per second, allowing the controllability of the modulated output signal. With this ability to control, it is possible to choose, for example, the total harmonic distortion of the signal output from the inverter, or the value of the fundamental term of voltage. It is also possible to select the low order harmonic, of interest for the selective reduction of harmonics. To show this feature, some examples have been developed with different number of pulses per period and with their corresponding parameter selection.

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