This paper proposes fuzzy logic controller based a single-phase seven-level inverter for grid-connected photovoltaic systems, with a novel pulse width-modulation (PWM) control scheme. Three reference signals produces from fuzzy logic controller which are identical to each other are going to compare with the amplitude of the triangular carrier signal. The inverter is capable of producing seven levels( Vab = Vdc Vab = 2Vdc/3 Vab = Vdc/3 Vab = 0 Vab =−V dc/3 Vab= − 2Vdc/3 Vab = −V dc )of output-voltage levels from the dc supply voltage. The total harmonic distortion is reduces by this control strategy. The proposed system was verified through simulation.

SATHISH KUMAR,G. RAVI KUMAR."A Seven-Level Grid Connected Inverter for Photovoltaic system". International Journal of Computer Engineering In Research Trends (IJCERT) ,ISSN:2349-7084 ,Vol.1, Issue 06,pp.586-591, DECEMBER - 2014, URL :https://ijcert.org/ems/ijcert_papers/V1I638.pdf,

[1] Nabae.A., Takahashi.I., and Akagi. H., “A new
neutral-point clamped PWM inverter”, IEEE
transactions on Industrial Applications, Vol.IA-17,
pp. 518-523, September/October 1981.
[2] Siriroj Sirisukprasert, Jih-Sheng Lai and TianHua Liu, “Optimum harmonic reduction with a sied
range of modulation indexes for multilevel
converters”, IEEE Transactions on Industrial on
Electronics, Vol.49,Issue 4, pp.875-881,August-2002.
[3] Brendan Peter McGrath and Donald Grahame
Holmes, “Multicarrier PWM strategies for
multilevel inverters”, IEEE Transactions on
Industrial Electronics, Vol.49, Issue4, pp.858-867,
August 2002.
[4] Lai.J.S., and Peng, F.Z., “Multilevel converter- a
new breed of power converters, “IEEE Transactions
on Industrial Applications, vol.32,Issue3. Pp.509-
517, May/Jun 1996.
[5] Villanueva. F, Correa, P, Rodriguez. J, Paca. M,
“Single-phase Cascaded H-bridge Multilevel
inverter for Grid connected hotovoltaic systems:,
IEEE Transactions on Industrial Electronics, Vol.56,
Issue 11,2009,pp 4399-4406.
*6+ Lee, S.J.; Bae, H.S.; Cho, B.H., “Modeling and
control of the single phase photovoltaic gridconnected cascaded H-bridge multilevel inverter”,
IEEE on Energy Conversion Congress and
Exposition (ECCE), 2009, pp. 43-47.
[7] José Rodríguez, Jih-Sheng Lai and Fang Zheng
Peng, "Multilevel inverters: a survey of topologies,
controls, and applications",IEEETransactions on
Industrial Electronics, Vol. 49, Issue 4, pp. 724-738,
August 2002.
[8] Sung-Jun, Park,Feel-Soon Kang, Man Hyung
Lee, and Cheul-U Kim,"A New Single-Phase FiveLevel PWM Inverter Employing a Deadbeat Control
Scheme", IEEE Transactions on power
electronics,Vol. 18, No. 3, May 2003, pp: 831-843
[9] Agelidis, V. G., Baker, D. M., Lawrance, W. B.,
andNayar, C.V.,“A multilevel PWM inverter
topology for photovoltaic applications,”Proceedings
of the IEEE International symposium on Industrial
Electronics, Vol. 2, pp. 589-594, July 1997, Portugal,
Guimaraes.
[10] Gui-Jia Su, “Multilevel DC-Link Inverter”, IEEE
Transactions on Industry Applications, Vol. 41, No.
3, May/June 2005, pp. 848-854.
[11] U. Indoo Niehaarika, P. Alekya Rani, K.
Lakshmi Ganesh “A NewHybrid Multilevel Inverter
with Reduced Number of Switches” in the journal
of IJIRD, Vol 2 Issue 3, March, 2013.
[12] K.Lakshmi Ganesh, U.Chandra Rao,
“Performance of Symmetrical andAsymmetrical
Multilevel inverters”, IJMER, vol.2,issue.2,MarApril 2012, pp-1819-1827.