Comparative Analysis of Third Harmonic Injection PWM and SPWM Control Techniques for UPS Inverter

T. Wanjekeche, D.V. Nicolae, and A.A. Jimoh (South Africa)


Uninterruptible Power Supply (UPS), Pulse Width Modulation (PWM), Sinusoidal Pulse Width Modulation (SPWM), Harmonic Injection.


Pulse Width Modulation (PWM) techniques has been researched for three decades but there are no explicit guidelines on how one can choose the desired technique for particular application especially in power processing devices. Thus choosing a particular PWM technique for UPS application remains a challenging task since UPS operate under varying load conditions. All the techniques appear to give superior performance as well as short comings when it comes to control of UPS inverter. This paper presents analytical and simulated results that demonstrate the equivalence between the two types of PWM control techniques and the superior performance when considering high conversion factor (C.F.) and Total Harmonic Distortion (THD) for UPS application.

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