Multilevel Inverter for Hybrid Energy Generation System V Karthikeyan 1, a * , V Jamuna 2,b and Abisha James 3,c 1,3 Dhanalskshmi Srinivasan College of Engineering & Technology, Chennai, India 2 Jerusalem College of Engineering, Chennai, India a vasu.karthi@gmail.com, b jamunamam@gmail.com, c abishajames@gmail.com Keywords: Multilevel Inverter, Reduced Number of Switches, Total Harmonic Distortion (THD), Simulation. Abstract. Applications of multilevel inverters have been widely accepted for high-power and high-voltage industry purposes. Their performance is very much superior to that of traditional two-level inverters due to reduced harmonic distortion and lower electromagnetic interference. In this paper a multilevel inverter circuit with reduced number of switches and symmetric voltage sources has been designed for hybrid generation system. The switching angles for various levels of the output are obtained by using the simple sine property. Finally, the 11-level inverter model is built using Matlab/ Simulink to validate this topology. The simulation results are presented. Introduction The concept of utilizing multiple voltage steps was introduced about 30 years ago entailing high power conversion[1].Multilevel inverters (MLI) are a very interesting alternative for medium and high power drive applications due to their modularity. In recent years the power electronic industries have been demanding higher power equipments[2-4]. A hybrid system is an integrated system having various input sources which together generates output according to the type of application. Multilevel inverters help to achieve the high power requirement through larger voltage steps and exhibits improved power quality and lower switching losses. There are several advantages to this approach when compared with the conventional power conversion approach[5]. The smaller voltage steps leads to the production of higher power quality waveforms and thereby reduce voltage stress on the load and the electromagnetic compatibility concerns[3]. The important feature of multilevel inverters is that several inverters are connected in series, which allows operation at higher voltages. However, the series connections are made by clamping diodes, which eliminates over voltage concerns [6]. Furthermore, since the individual switches are not truly series connected, their switching operation can be staggered, which reduces the switching frequency and switching losses [7]. The MLI using cascaded H-bridges with separated DC sources, hereafter called a cascade multilevel inverter (CMLI), appears to be superior to other MLIs in term of its structure that is not only simple and modular but also requires the less number of components. Due to this modular structure, it is easily extendable for higher number of output levels without undue increase in power circuit complexity. In addition, extra voltage balancing capacitors or clamping diodes are not required [2-4]. One aspect which sets the cascaded H-bridge apart from other multilevel inverters is the capability of utilizing different DC voltages on the individual H-bridge cells which results in splitting the power conversion and asymmetrical multilevel inverters can be obtained. In this