Comparative Analysis of Triangle and Trapezoidal Carrier Signal for 3-Level ANPC Inverter

Abstract

Introduction: Multilevel topologies are becoming more and more popular, and new topologies have been created. High voltage is used to create staircase output in order to lower the THD. For the carrier signal triangle and trapezoidal signal has been arranged in Phase opposition pulse width modulation (PODPWM), phase disposition pulse width modulation (PDPWM), alternative phase opposition disposition pulse width modulation (APODPWM), phase shifted PWM (PSPWM), to analyze the total harmonic distortion for ANPC topology. In this paper the RMS value of phase voltage and THD value of output voltage is comparing and  the most effective PWM technique for a 1500V DC bus, three phases, 3 level ANPC inverter is identified for use with 1200V switching devices. SIN wave is used as a reference signal to simulate and compare two different carrier signals for three-level inverter in PSIM software.

Objectives: Several innovative modulation techniques for ANPC are incorporated into the control algorithm. The optimization targets can be divided into the following three categories.

• The main objective is to Reducing the voltage THD.


• The second objective is to increase the output voltage by recommending suitable modulation techniques.