| 摘要 |
The invention relates to a photovoltaic system (1), comprising a plurality of photovoltaic subsystems (3), each of which is provided with a photovoltaic generator (5) that can be connected to the input of an inverter (9) dedicated to the photovoltaic generator. The inverter has a control element for setting the maximum power point (MPP) of the photovoltaic subsystem to which it is connected. Parallel to the photovoltaic generator, a battery (15) can be connected, wherein the outputs of all inverters can be connected to a mutual power supply network (11). The network is operated by a network operator. A control device (21) is provided, which initiates the following measures in the event that an emergency signal (N) was received indicating impending instability of the power supply network and was forwarded to the control device by the network operator: i) If the battery voltage (UBatt) is above the current voltage (UWR) as set by the MPP control element, an immediate connection of the battery to the input of the inverter while maintaining the connection of the photovoltaic generator to the inverter takes place; ii) if the battery voltage is below the current voltage as set by the MPP control element, connecting the battery to the input of the inverter is delayed until the MPP control element has adjusted the voltage prevailing at the input to the battery voltage. After connecting the battery, the voltage is further lowered in order to generate a discharge current from the battery. The measures serve to stabilize the power supply system while avoiding circuitry-based, short-term drops in performance. |
