Multi Level Inverter with Dc Link Switches

Abstract

This paper presents a single phase 5 level inverter with dc link Switches using POD technique .The proposed multi level inverter is capable of generating 5 level output with less component count .This technique uses single carrier wave and two sine waves for pulse generation .The entire system is designed and implemented using MATLAB/Simulink .The inverter is connected to a R-load and performance are analysed. I. INTRODUCTION Now a days Multi level inverter are extensively used due to their increased power rating, reduced EMI , improving harmonic performance. Multi level inverters are switched at low switching frequency when compared to two level inverters, hence the switching losses are almost negligible .The multi level converter topology has drawn tremendous interest in the power industry since it can provide the high power required for high power applications.. To cope up with the problems associated with the two-level inverter, multi-level inverters (MLIs) are introduced Multi level inverters are classified into 3 types  Diode clamped multi level inverter  Cascaded H bridge multi level inverter  Flying capacitor type multi level inverter The applications of multilevel inverter are reactive power compensation, variable speed drives etc. The topological structure of Multi level inverters should be capable of withstanding high input voltage for high power applications. A new multi level inverter is proposed which is capable of reducing problems faced by usage of conventional multi level inverters. The advantages of proposed multi level inverter when compared with conventional Multi level inverter are : 1. Number of devices of the proposed multi-level inverter is fewer than that of the conventional multi-level inverters. Therefore, the proposed system is more reliable and cost competitive than the conventional two-level and multilevel inverters.2. Only one carrier signal is required to generate switching pulses to 8 switches used in proposed Multi level inverter (1).