• J. Mahesh Yadav
• 2P. Balakishan
• 3K.Roopa

Two-level inverters are popularly used in PV systems to converter DC voltage into AC voltage. But the two-level inverters contains drawbacks like poor harmonic profile, high dv/dt and so on. To address these issues, many multi-level inverters are proposed in the literature. But harmonics are still present at first center and which is equal to switching frequency even with multi-level inverters. In order to shift harmonics to further higher levels, switching frequency has to be increased. If the switching frequency of inverter increases, switching losses increases. The percentage of losses increases further more in medium voltage and high voltage applications. To address this issue, a novel PWM technique for a five-level inverter is presented in this paper. The five-level inverter is developed by using one leg of three-level diode clamped inverter and one leg of two-level inverter. Two isolated DC voltage sources are connected to the entire inverter configuration. By using a novel PWM technique, all harmonics are shifted near to second center band which is equal to two times switching frequency. As availability of isolated dc sources are common in case of different PV system modules, two dc sources can be easily obtained. The proposed inverter is simulated in MATLAB/Simulink and results are presented. The analysis is carried to study the behavior of the inerter during the failure of some switching devices and Dc sources.

Fault tolerant inverters; Multi level- inverters; PV applications; Sine-Triangle PWM

"Five-level Inverter for PV Applications with Reduced Harmonics ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 10, page no.219-223, October-2018, Available :http://www.jetir.org/papers/JETIRJ006034.pdf

"Five-level Inverter for PV Applications with Reduced Harmonics ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 10, page no. pp219-223, October-2018, Available at : http://www.jetir.org/papers/JETIRJ006034.pdf