Improvement in power efficiency of photovoltaic array under shading condition using bypass diode

Saptadip Saha, Samima Akter, Kailash Kumar Mahto, Priyanath Das, Ajoy Kumar Chakraborty, Gaurav Kumar Awasthi

Abstract


In this paper, we have studied and analyzed the shading effect on solar photo voltaic (SPV) modules connected in series using four 75 W SPV modules for three different shading conditions: (1) one module is fully shaded, (2) two modules are fully shaded and (3) three modules are fully shaded. The performance of the modules which decreased due to shading effect are improved in each case using bypass diodes connected in parallel with each of the modules. This analysis is done by using the simulation model in PSCAD and an outdoor experiment is also performed to validate the simulation results for the same configurations. An improvement in open circuit voltage (Voc), short circuit current (Isc), maximum power (Pmax) and power efficiency are observed when bypass diodes are used. During an outdoor experiment when one panel is shaded the power efficiencies are 17.96 % and 12.79 % with and without bypass diodes respectively. In case of two modules are shaded these values are 14.50 % and 9.63 % respectively. When three modules are shaded the power efficiency is 3.59 % in case of without bypass diode, which is increased to 6.87 % with bypass diodes.


Keywords


Solar photovoltaic; irridiation; bypass diode; simulation; efficiency; PSCAD

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DOI (PDF): https://doi.org/10.20508/ijrer.v6i2.3385.g6828

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