Comparison between SVPWM two level in internal and external circle of hexagon

Abstract

Abstract. This study presents a space vector pulse width modulation (SVPWM) method. Switching time for SVPWM two level is used to generate a sinusoidal waveform from the inverter. This waveform using as input for the induction motor. Usually, we use the internal circle to generate sinusoidal method. However, from the calculation, we can get two different equations, for the internal circle in hexagon and external circle for the hexagon. Comparison between voltage vector in the internal and external circle of hexagon using THD (Total Harmonic Distortion) value for each circle.

Novel approach for SVPWM of two-level inverter fed induction motor drive

“…The three-phase VSI has six power switches S1 to S6 with eight possible switch combinations. So eight possible vectors are obtained, two vectors are null vector (zero states (8 -7)), and the others are voltage vector (active states (1-6)) [14].…”

“…can not be active together because there will be a short circuit on the power source. So switching function for motor phases can be defined as follow [14];…”

“… ISSN: 2088-8694 Depenbrok [16] strategy or six-step approach is aimed at minimizing the inverter switching in each supply period to the detriment of the control of the stator flux amplitude. The maximum value of the voltage due to the opening of the switch is V DC with using the work area on the outer circle respectively of the hexagon [14]. So the modulation index M can be calculated as follow [1],…”