Implementation, comparison and experimental verification of nearest vector control and nearest level control techniques for 27-level asymmetrical CHB multilevel inverter

In this paper, implementation and comparisons of Nearest Vector Control and Nearest Level Control modulation techniques for 27-Level with 3-Cell Asymmetrical Cascaded H-Bridge Multilevel Inverter is presented to analyse the performance and application oriented complexity. Asymmetrical type of multilevel inverters is familiar in the view of attaining more number of levels with lesser number of cells. Hybrid Asymmetrical Multilevel Inverter gives higher levels than other asymmetrical inverters with no redundant switching states for the entire operation. Modulation Strategy takes foremost involvement in the conversion process, but the selection of strategy is based on the type of application and topology of inverter. This paper reviews the comparative performance parameter analysis to choose a suitable modulation technique for different applications. The adoptive nature of Nearest Vector Control and Nearest Level Control strategies are analysed through Simulation and Experimental results.