Detection of Partial Shading in a PV string and GMPPT using P&O

What is it about?

This paper proposes a simple scheme for detecting the occurrence of non-uniform irradiance on series-connected photovoltaic modules. For this scheme, only one pair of voltage and current sensors is required per string. The proposed algorithm is very suitable for the popular string inverter topology.

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Why is it important?

Existing literature uses complicated techniques such as thermal imaging for detection of partial shading in a PV string. This paper, however, does not use any extra sensors except one voltage and current sensor each, which are, by default, available in any MPPT tracking system.