Staircase Modulation for Thirteen level cascaded H Bridge Inverter with Different Staircase Wave Generation Techniques

Abstract

This paper proposed a staircase modulation with different staircase generation for a thirteen level cascaded H bridge inverters. staircase modulation scheme is developed to achieve the control of MLI. This paper discusses various staircase wave generation methods such as half height (HH) method, Half Equal Phase (HEP) method and Feed Forward (FF) method to find step size of staircase wave. The analysis of different staircase waves in control of MLI is carried out with an thirteen level cascaded H Bridge Multilevel inverter using phase shift carrier modulation. The proposed methods results in staircase reference wave generation with lesser THD compare to other conventional MLI. The performance of 13 level CHB with different staircase reference signal is analyzed in terms of THD through extensive simulations and By comparing the three staircase reference signal generating methods HH method shows lesser THD.