METHOD FOR MINIMISING A NETWORK FEEDBACK OF A PV PARK INVERTER AND PV PARK

摘要

The invention relates to a method for minimising a network feedback of a PV park (10) on an energy supply network connected to a network connection point, wherein the PV park (10) comprises a plurality of inverters (1-8) divided into groups (12, 13). In the method, for at least one first inverter (2, 3, 7) of each group (12, 13), a first parameter is determined which is representative of a first coupling impedance (ZT 2, ZT 3, ZT 7) between the first inverter and the network connection point, and a second parameter is determined which is representative of a second coupling impedance (ZN 2, ZN 3, ZN 7) between the group (12, 13) containing the first inverter (2, 3, 7) and the network connection point, and stored in an operation control unit of the first inverter. During a daytime operation of the PV park (10), reactive power supplied via the first inverter (2, 3, 7) in accordance with the first parameter, which corresponds to the magnitude of a reactive power received by the respective underlying first coupling impedance (ZT 2, ZT 3, ZT 7). During a night-time operation, all inverters of a group (12, 13), except the first inverter (2, 3, 7), are deactivated and reactive power is supplied via the first inverter (2, 3, 7) in accordance with the second parameter, wherein the supplied reactive power corresponds to the magnitude of a reactive power received by the respective underlying second coupling impedance (ZN 2, ZN 3, ZN 7). The invention also relates to a correspondingly configured inverter (2, 3, 7), as well as a corresponding PV park (10).