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Published on March 9, 2014

Author: ShivaKumar304

Source: slideshare.net

UNDER THE GUIDENCE OF PRESENTED BY P.RAJENDAR B.SATHYANARAYANA(10QK1A0227) (Asst.prof.) P.SHIVA KUMAR (10QK1A0229) N.SHRAVAN KUMAR (10QK1A0231)

Introduction :  In this project, initially a new topology for submultilevel inverter is presented and then series connection of the submultilevel inverters is proposed as a generalized multilevel inverter.  The proposed multilevel inverter uses reduced number of switching devices and has been analyzed in both symmetric and asymmetric conditions.  Simulation is implemented using MATLAB-SIMULINK and the results are presented. The Asymmetrical 31-level inverter using 12 switches has distortion of only 0.2% and 13-level symmetrical inverter using 16 switches shows 0.8%.

In one simple inverter circuit, DC power is connected to a transformer through the center tap of the primary winding.  A switch is rapidly switched back and forth to allow current to flow back to the DC source following two alternate paths through one end of the primary winding and then the other.  The alternation of the direction of current in the primary winding of the transformer produces alternating current (AC) in the secondary circuit. 

EXISTING SYSTEM TECHNIQUE There are three well-known types of multilevel inverters  the neutral point clamped (NPC) multilevel inverter,  the flying capacitor (FC) multilevel inverter, and  the cascaded H-bridge (CHB) multilevel inverter.

PROPOSED SYSTEM TECHNIQUE  In the symmetric topology, the values of all of the dc voltage sources are equal. This characteristic gives the topology good modularity. However, the number of the switching devices rapidly increases by increasing the number of output voltage level.  In order to increase the number of output voltage level, the values of the dc voltage sources are selected to be different, these topologies are called asymmetric.

Block diagram: DC supply MLI CONTROL SIGNAL TO LOAD

ADVANTAGES • Less switching devices are used. • Switching losses are low. • Efficiency is high. • Control scheme is simple.

APPLICATIONS  Pump, fans, compressors.  Photovoltaic power-conversion system.  Wind power conversion.

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