Photovoltaic system, control circuit for a photovoltaic system and method for controlling a photovoltaic system

摘要

Photovoltaic system (10), comprising at least one photovoltaic string (12), each photovoltaic string (12) having a plurality of series-connected photovoltaic modules (18), wherein at least one photovoltaic module (18) via a step-down converter (20) in the photovoltaic string (12) wherein the step-down converter (20) provides an output voltage (Vx ') to the photovoltaic string (12), wherein a controllable bypass switch (34A, 34B) is connected in parallel with the step-down converter (20), the controllable bypass switch (34A, 34B) is open, as long as a voltage (Vx) that drops across the photovoltaic module (18) is less than or equal to a predetermined first voltage limit (V), and wherein the controllable bypass switch (34A, 34B) is closed, as long as a voltage (Vx) that drops above the photovoltaic module (18) is greater than the predetermined first voltage limit (V).