In this paper, a new three-phase unbalanced distribution load flow (DLF) technique is proposed to study the impact of distributed generations (DGs) installed in the distribution networks in mitigating the voltage sag. Distributed generations are modeled as variable reactive power and constant power factor source with both wind- and solar-powered DG in the case study. The proposed DLF technique is based on the application of set theory. Effect of DGs in mitigating voltage sag is mathematically explained with the help of phasor diagram. The proposed technique is tested over standard IEEE 13 and IEEE 123 bus distribution networks with programming in MATLAB platform. To justify the claims, different cases have been studied like load increment and increasing maximum power limit of DGs. Also, a comparison is drawn between proposed DLF technique and traditional backward–forward sweep method where the efficacy of proposed technique is proved over the traditional method.
Cite this article as: U. Sur. Impact study of distributed generations in voltage sag mitigation using an improved three-phase unbalanced load flow for active distribution network. Turk J Electr Power Energy Syst, 2022; 2(2), 124-133.