• Chaitra.N.Sherikar
• Dr.Eranna

In the present work, a single-phase grid-connected photo voltaic inverter is supplied by series-connected power optimizer (POs); a straightforward and real-time open-circuit fault (OCF) detection technique is suggested. PO controllers periodically track differences in output voltage of power optimizer and calculate remaining mistakes in output voltage to implement the suggested technique. Then, on the PO side, the inverters OCF identification rule is developed based on the voltage variation amount and the improved judgment criterion derived from residual voltage error and power. The proposed method for detecting open circuit fault (OCF) is low cost and real time, requiring no additional hardware and no communication between the inverter and power optimizers (PO).Generally speaking, in series-connected distributed DC power or energy storage systems, the technique offers a reliable and quick solution to detect OCFs. Experimental results verify its efficiency and reliability. The circuit simulation is carried out in MATLAB/SIMULINK it is seen that the total harmonic distortion (THD) is reduced and is less than 6% which agrees with IEEE Standards. The experimental results are in good agreement with the simulation results and thus the model is validated.

Inverter, Open-circuit fault (OCF), Grid-connected photo voltaic (PV) system, Power optimizer (PO), Maximum power point (MPP) & Total harmonic distortion (THD).

"A SIMPLE OPEN CIRCUIT DETECTION STRATEGY FOR A SINGLE PHASE 7 LEVEL GRID CONNECTED CASCADED H-BRIDGE MULTI-LEVEL INVERTER FED FROM POWER OPTIMIZERS.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.505-510, June 2019, Available :http://www.jetir.org/papers/JETIR1907958.pdf

"A SIMPLE OPEN CIRCUIT DETECTION STRATEGY FOR A SINGLE PHASE 7 LEVEL GRID CONNECTED CASCADED H-BRIDGE MULTI-LEVEL INVERTER FED FROM POWER OPTIMIZERS.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp505-510, June 2019, Available at : http://www.jetir.org/papers/JETIR1907958.pdf