• THULASI BALARAMAKRISHNA
• B.THEJESVI

Photovoltaic energy conversion becomes main focus of the many researches because of its promising potential as source for future electricity and has many benefits than the other energy sources like wind, solar, ocean, biomass, geothermal etc. In this paper a cascaded H-Bridge (CHB) multilevel converter primarily based photovoltaic (PV) system with no voltage or current sensors at the dc-side is planned using incremental conductance base maximum power point tracking scheme. Eliminating the dc-side sensors simplifies the hardware, resulting in lower price and better reliable-ness of the PV system. A novel scheme estimating the capacitors’ voltages from the output ac voltage of the inverter is developed. The scheme permits replacement all dc-side voltage sensors by one voltage sensor at the ac-side of the converter. Moreover, the dc current sensors, conventionally needed for the maximum power tracking (MPPT), also are eliminated. Instead, the outputs from the capacitors’ voltage control systems are used for the MPPT. The effectiveness of the projected dc-side sensor-less system is simulated on a 2 KW single-phase 7-level CHB converter based PV system. The simulation was done by using MATLAB/Simulink software.

Capacitor-voltage estimation, cascaded H-bridge (CHB) converter, photovoltaic (PV) system, Fuzzy logic controller, MATLAB.

"LOW COST CASCADED H-BRIDGE MULTILEVEL CONVERTER WITH DC SIDE SENSOR LESS PHOTOVOLTAIC SYSTEM", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.4, Issue 11, page no.671-676, November-2017, Available :http://www.jetir.org/papers/JETIR1711114.pdf

"LOW COST CASCADED H-BRIDGE MULTILEVEL CONVERTER WITH DC SIDE SENSOR LESS PHOTOVOLTAIC SYSTEM", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.4, Issue 11, page no. pp671-676, November-2017, Available at : http://www.jetir.org/papers/JETIR1711114.pdf