| 摘要 |
The invention relates to a method which can be used to switch photovoltaic modules (PV modules) in a PV installation to a safe state in the case of a hazard. Control units (3), which are each associated with a PV module, are used to measure the voltage profile and/or the current for each PV module (1). As soon as the voltage of a PV module (1) increases from the operating voltage to the idle voltage or the voltage drops from the idle voltage to the operating voltage or the current in the phase (2) falls below a reference value, the control unit (3) associated with the PV module (1) is activated. When the control unit (3) is activated, either the PV module (1) is isolated from the phase (2) on at least one connection side (1.1, 1.2), with the result of at least one isolation location having a capacitor (22) remaining connected in parallel with it, or the PV module (1) has a low-impedance load (17) connected in parallel with it in clocked fashion. |
