An undervoltage protection function for distributed generators complying with the low-voltage-ride-through requirements

This paper implements an undervoltage protection function for distributed generators connected to distribution systems, which complies with the recent low-voltage-ride-through requirements. This function takes account of the adopted low-voltage-ride-through curve, as well as the relevant requirements concerning consecutive low-voltage disturbances. In this regard, it can preserve low-voltage-ride through operation, concurrently preventing an excessive network energization by the generator. The designed function is described in detail, while, it is modelled using MATLAB/Simulink. Furthermore, it is tested by simulating different kinds of consecutive low-voltage disturbance events.