Method for operating a photovoltaic system with energy storage and bidirectional converter for connecting an energy storage device

摘要

For operating a photovoltaic system (1) with an inverter (2), with a photovoltaic generator (3) connected to an input (7) of the inverter (2), wherein the inverter (2) supplies an operating voltage of the photovoltaic generator (3) at the input ( 7) and for tracking an operating voltage of maximum power of the photovoltaic generator (3) is arranged, with an energy store (4) for electrical energy and with a bidirectional converter (5) via which the energy store (4) parallel to the photovoltaic generator (3 ) is connected to the input (7) of the inverter (2) is detected by the converter (5) a time course of the output from the photovoltaic generator (3) power. In a compensation mode, the converter (5) is operated in such a way that it compensates for variations in the power of the photovoltaic generator (3) relative to a nominal power flowing via the input (7) into the inverter (2). In a tracking mode, the converter (5) is operated to enable the maximum power supply voltage to be tracked by the inverter (2). During operation of the photovoltaic system (1), in which power from the photovoltaic generator (3) is available, is repeatedly changed between the compensation mode and the tracking mode.