Centralized Control Topology for PV Farms Shading Detection and GMPP Searching Restarting Condition

Cesar Negri, Saeed Daneshvardehnavi, Kork Schmitt Konrad Erich, Ali Esmaeel Nezhad, Pedro H. J. Nardelli, Stephen Bayne, Michael Giesselmann

Research output: Contribution to journalArticlepeer-review

Abstract

The power output of the solar panels follows a power-voltage (P-V) characteristic containing only one Global Maximum Point (GMP) in the normal conditions. However, under Partial Shading Conditions (PSC), the unbalanced irradiance in the panels creates Local Maximum Points (LMP) in the P-V curve. Standard control techniques for Maximum Power Point Tracking (MPPT) can not properly locate the GMP, stagnating in LMPs and generating losses in the energy harvesting. Specific techniques to locate the GMP are presented in the literature. However, the condition to restart the GMP is not widely discussed. The main challenges of global search algorithms are related to the restarting conditions. Avoiding unnecessary searching and providing an assertive GMP restarting condition is crucial for PV systems operation. In every GMP search, the solar inverters oscillate the power exchanged with the grid, causing frequency and voltage variations depending on the size of the PV plant. This paper
Original languageEnglish
JournalIEEE Access
StatePublished - Mar 10 2022

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