US 12,438,378 B2
Controlling a solar power plant
Richard Grasböck, Wels-Thalheim (AT); Johannes Graf, Wels-Thalheim (AT); Stefan Wieser, Wels-Thalheim (AT); and Christian Fasthuber, Wels-Thalheim (AT)
Assigned to Fronius International GmbH, Pettenbach (AT)
Appl. No. 18/730,520
Filed by Fronius International GmbH, Pettenbach (AT)
PCT Filed Jan. 26, 2023, PCT No. PCT/EP2023/051858
§ 371(c)(1), (2) Date Jul. 19, 2024,
PCT Pub. No. WO2023/144239, PCT Pub. Date Aug. 3, 2023.
Claims priority of application No. 22153880 (EP), filed on Jan. 28, 2022.
Prior Publication US 2025/0141233 A1, May 1, 2025
Int. Cl. H02J 3/38 (2006.01); G05F 1/67 (2006.01)
CPC H02J 3/381 (2013.01) [G05F 1/67 (2013.01); H02J 2300/26 (2020.01)] 14 Claims
OG exemplary drawing
 
1. A method for optimizing a maximum power point of a solar cell stack comprising a plurality of modules and an inverter, each module of the plurality of modules comprising an MLSD unit, which shuts down the connected module as soon as a module voltage of the respective module falls below a first module voltage threshold value, and which switches the connected module on, when a predefined second module voltage threshold value is exceeded, the method comprising:
defining an electrical control parameter;
changing the electrical control parameter to a predefined first wait value with the inverter, the first wait value being determined such that the second module voltage threshold value of the plurality of modules is exceeded;
keeping the electrical control parameter at the first wait value for a predefined first time period, such that the plurality of modules is switched on by the MLSD units
changing the electrical control parameter to a parameter threshold value in a variation range with the help pf the inverter and determining current-voltage curves for the plurality of modules in the variation range;
determining a maximum stack power of the solar cell stack from the current-voltage curves of the plurality of modules determined in the variation range;
predefining the determined maximum stack power in the solar cell stack as the maximum power point.