Impact of voltage phase angle changes on low-voltage ride-through performance of DG-units

Based on computer simulations of a simplified radial 132, 66 and 22 kV system including a 5 MVA hydro power unit, it is concluded that the assessment of the unit´s fault-ridethrough (FRT) capability should be based not only on a voltage magnitude profile, but also on the change in the voltage phase angle. It is assumed that erroneous conclusions might be the result when FRT-capability studies are performed for distributed generation without taking into account the influence of the phase-angle change in this context. Further work will be conducted in order to quantify the effect of phase angle influence on the FRT capability of distributed generation units.