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SINGLE PHASE MULTI-STRING MULTILEVEL INVERTER FOR MICRO GRID APPLICATIONS

Dr. RAMA RAO P.V.V., S.VEERABABU, N.SARATH CHANDRA

This paper presents a single-phase multi-string multilevel inverter for micro grid applications. The multilevel topology consists of few H-bridges connected in series, each one connected to a string. The proposed multistring multilevel inverter needs only six switches whereas conventional cascaded H-bridge multilevel inverter need eight switches. The multi-string inverter topology offers advantages like quality output waveform, small LC filter size, lower total harmonics distortion (THD) and less electromagnetic interference (EMI). The results are compared between with and without pulse width modulation (PWM) technique for both the multi-string cascaded H-Bridge inverter and multi-string multilevel inverter in MATLAB/Simulink environment.