As per the latest IEA-PVPS report, in partially shaded PV generators, string inverters (SINV) can surpass module-level power electronics (MLPE).
The technical report, “Performance of Partially Shaded PV Generators Operated by Optimized Power Electronics 2024,” highlights the recent obstacles of partial shading in PV systems and assess the most recent technological transformation for upgrading energy performance under such circumstances.
IEA-PVPS stated that heterogeneous shading on PV generators causes extremely high losses. It described that a combination of optimized module placement, the use of modules that are tolerant of shading, and optimized power electronics can assist in optimising the production of partially shaded installations.
It is announced that the utilisation of shade-tolerant PV modules, which typically highlights four or more bypass diodes rather than three. A greater number of bypass diodes per module makes it feasible to particularly bypass ineffectual areas of the modules, accelarating an increase in module production. Furthermore it is stated that the initial manufacturers are commencing to position such modules on the market.
As per the report, under weak to medium shading, SINV supply the highest yields such as light obstructions from a chimney or module. This is applicable when shade covers rarely one-tenth of a module in the string at once during the six hours throughout the midday.
In order for PV planners to provide consumers the exceptional PV design under partial shading conditions, PV software tools must upgrade their component efficiency data and calculations for each optimizer’s operating points based on each solar cell within a module, stated IEA-PVPS.
The report also focused on progressing research directed at bringing down the effects of PV shading, including progresing advanced power electronics for single solar cells and maximising single-axis mechanical tracking systems for large-scale PV plants on rough terrain.
