The effect of placement of distributed generation on mitigating voltage sag in distribution network

Power quality is one of the most discuss topics in power industry. There are numerous types of power quality issues but voltage sags and harmonics are a major concern to the customers. Generally, voltage sags are short duration reductions in rms voltage caused by faults in the electric supply system and starting of large loads. Many industrial customers using sensitive equipments suffer a huge loss because of sag. Therefore, this paper intends to investigate the effects of distributed generator´s (DG) installation for different fault location in distribution network. PSCAD 4.2.0 is chosen to simulate the distribution system in order to obtain the best placement of distributed generator in distribution network, together with determining the effects of DG on voltage sag. simulation covered for radial distribution network, only one balanced three phase fault will occur at one time, fixed capacity of synchronous generator are used for all placements of distributed generators and they are applied during fault conditions. Simulations covered on three major parts which are simulation on normal condition, simulation on fault condition, and simulation on fault condition with the application of distributed generator. 9 output voltages are observed and analyzed to determine the effects of distributed generator on voltage sag and best placement of distributed generator can be obtained based on the large improvement of voltage sag in the system.