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IJSTR >> Volume 8 - Issue 10, October 2019 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Harmonics Analysis Of A SPV Based Stand-Alone And Grid Connected Multilevel Inverter With Improved Power Quality At Different Load

[Full Text]



Mohmmad Ahmad, Sheeraz Kirmani



Grid connected Solar PV, stand-alone solar PV system, multilevel inverter, Power Quality, Point of common coupling (PCC), Total Harmonic Distortion (THD), Linear and non linear load.



This paper analyzes the performance of Solar PV based stand-alone and grid connected multilevel inverter topology. For standalone system having different load power factor with and without filter, this is found that when the filter is connected, the THD is reduced from 12.2% to below 5% (IEEE standard). Moreover, it is also explained that the minimum THD and maximum circuit efficiency is achieved at a particular load power factor. Further the performance is analyzed for a grid connected system having linear and nonlinear load connected at PCC with and without filter. For a linear load, if the filter is connected then the THD in PCC voltage is reduced from 13% to below 5% and the THD in grid current falls from 14.8% to below 5 %. The efficiency of the complete configuration is calculated as more than 80%, however due to additional losses in filter a small decrement in efficiency is examined. Similarly for a nonlinear load of Diode Bridge, the harmonics in PCC voltage, grid current can be reduced to the IEEE standard by connecting filter. Simulation results from SIMULINK/MATLAB Software are tabulated for both standalone and grid tied PV system and the results are explained graphically.



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