Implementation of Multi level Inverter Topology with Reduced Switches for Grid Interconnection of PV Systems

Abstract

This paper presents a multilevel inverter that has been conceptualized to reduce component count, particularly for a large number of output levels. It comprises floating input dc sources alternately connected in opposite polarities with one another through power switches. Each input dc level appears in the stepped load voltage either individually or in additive combinations with other input levels. This approach results in reduced number of power switches as compared to classical topologies. Renewable energy sources plays a key role in recent times as they are free from pollution, unlimited and reduces the cost related with its control. Among them Solar energy is more beneficial as the impact of solar systems on environment are significantly lower than non-solar system. Generally, solar cell is the device which converts solar energy into DC electricity. Usually we need a suitable converter for the purpose of conversion from DC to AC and then it is injected to power Grid. In this paper, the inverter action is carried out by using cascaded H-Bridge inverter with reduced number of switches. The proposed inverter is been used to integrate the solar system to Grid, taking into consideration of Grid requirements. In the absence of solar supply, we use Grid to feed the load. In the present work, a multilevel line commutated  inverter  topology  has  been  proposed  and  analyzed  which  improves  t he  wave  shape  and  hence  reduces  the  total  harmonic  distortion  (THD) of the line current in a grid tie line commutated inverter. The proposed Cascaded H-Bridge Inverter will be simulated using MATLAB/SIMULINK.