Analysis of Transients in Active Distribution Network

Transients are one of major incident in power network which occurs due to the momentary change in voltage and currents for lightning strokes, switching operations, short circuits, resonance conditions and load variations. Now, in the active distribution network (ADN), the probability of transient occurrence is much higher due to uncertain penetration of distributed generation (DG) power to the grid. This causes different faults in the DG connected generator or load buses in the ADN. These faults can be classified as overloading/underloading faults and false tripping of lines i.e, branch faults. Now, active energy sources are one of the most vital components of an ADN which are affected mostly by the transients. Hence the impact of transients on synchronous generators in terms of different fault parameters like generator’s rotor angles, field voltages, currents and terminal voltages are necessary to analyze in this network. Here, the transient analysis is considered by developing an ADN in Power World Simulator where these two transients such as load fault and branch faults at the different buses are tested in presence of DG. The above generator’s fault parameters are determined and comparatively analyzed for both the faults considering the sub-transient, transient and steady state period.