Method for minimizing network feedback of solar power plant, inverter and solar power plant

摘要

The present invention relates to a method for minimizing network feedback of a photovoltaic plant (10) for an energy supply network connected to a network connection point, wherein the photovoltaic plant (10) is grouped into groups (12, 13). The present invention relates to a method comprising a plurality of divided inverters (1 to 8). In the method, for at least one first inverter (2, 3, 7) in each group (12, 13), a first coupling impedance (ZT2, ZT3, ZT7) is determined and a second coupling impedance (ZN2, ZN3) between the group (12, 13) including the first inverter (2, 3, 7) and the network connection point is determined. , ZN7) is determined and stored in the operation control unit of the first inverter. In the daytime operation of the photovoltaic power generation facility (10), reactive power is supplied in accordance with the first parameter via the first inverter (2, 3, 7), and the reactive power is the first basis on which each is based. This corresponds to the magnitude of reactive power received by the coupling impedance (ZT2, ZT3, ZT7). In night operation, except for the first inverter (2, 3, 7), all inverters in the group (12, 13) are stopped and the reactive power is reduced according to the second parameter to the first inverter (2, 3, 7). 7), and the supplied reactive power corresponds to the magnitude of the reactive power received by the respective second coupling impedance (ZN2, ZN3, ZN7). The invention also relates to a correspondingly configured inverter (2, 3, 7) and a corresponding solar power installation (10). [Selection] Figure 1