What is it about?

In medium and large PV power plants several PV modules are required to be connected in series to increase the voltage level. This leads to considerable reduction in amount of power being extracted from the PV plant when the serially connected PV modules experience different operating condition, eg, shading. This scheme proposes a simple strategy to extract maximum power from each of the serially connected modules irrespective of their operating condition.

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Why is it important?

Solar PV panels/modules are still expensive and hence it is very important to extract every watt of power from solar modules. This is a challenge when several modules are connected in series and they are subjected to mismatched operating conditions, viz shading. Under this scenario, the proposed scheme is very useful and important in the sense that it can extract maximum power from each of the serially connected modules irrespective of their operating condicitons

Perspectives

This particular schemes are advantageous as compared to existing DMPPT schemes in following aspects: 1. It requires to execute only one conventional MPPT alrorithm to extract maximum power from each of the serially connected PV modules irrespective of their operating conditions  Reduction in current sensor requirement: only 1 current sensor and (N+1) voltage sensor wherein N= number of PV modules connected in series  Less burden on processor: needs to execute only 1 conventional MPPT algorithm  No communication requirement between local converters  True/exact MPPT at steady state  Simple implementation  Generalized scheme/strategy: independent of power circuit configuration

Dr Dipankar Debnath

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This page is a summary of: Simple scheme to extract maximum power from series connected photovoltaic modules experiencing mismatched operating conditions, IET Power Electronics, March 2016, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/iet-pel.2015.0068.
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