Abstract
Currently, pulse-width modulation (PWM) methods based on fixed carrier signals are widely used for voltage source inverters (VSI). These methods include the well-known sinusoidal PWM (SPWM) and space vector PWM (SVPWM). However, there is an alternative PWM method, in which individual pulses are not limited by the sample period of the reference carrier signal, but it can vary in width and position over the full period of the VSI output voltage signal within the symmetry. This method in international literature is referred to as Programmed Pulse Pattern PWM (PPWM). In this article, an analysis of the PPWM with selective harmonic elimination (SHE) for two-level (2L) forms of the VSI output voltage will be carried out. SHE is one of the earliest and most common ways to implement PPWM, which is aimed at removing lower order harmonics in accordance with a given number of switching. As a result of the research, six PPWM SHE were calculated for 2L quarter-wave symmetry VSI voltage forms (from the 5th and 7th harmonics to the 35th and 37th harmonics). The PPWM patterns were graphically presented by the dependences of the angles and a modulation index. The spectra and the total harmonic distortion coefficients up to the 50th harmonic of the VSI output voltage were obtained in the modulation index range from 0 to 1.15 with a step of 0.01. The most significant results of the conducted research are the obtained dependences of individual harmonic components on the modulation index. The research results have perspectives to develop PPWM with SHE methods for power converters to limit switching frequency of semiconductor modules, solve the electromagnetic compatibility problems, increase energy efficiency and optimize power losses.
Keywords
power converters, pulse-width modulation, programmed pulse pattern, selective harmonic elimination, voltage source inverter
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