01921nas a2200241   4500000000100000000000100001008004100002260001200043653001600055653002200071653003300093653002700126100001400153700001600167700002100183700001600204245011900220856009900339300001000438490000600448520121100454022001401665       2020                            d  c03/202010aFuzzy Logic10aVoltage Stability10aWhale Optimization Algorithm10aDistribution Generator1 aAli Selim1 aSalah Kamel1 aFrancisco Jurado1 aLoai Nasrat00aVoltage Stability Assessment of Radial Distribution Systems Including Optimal Allocation of Distributed Generators  uhttps://www.ijimai.org/journal/sites/default/files/files/2020/02/ijimai20206_1_4_pdf_13565.pdf  a32-400 v63 aAssessment of power systems voltage stability is considered an important assignment for the operation and planning of power system. In this paper, a voltage stability study using Continuous Power Flow (CPF) is introduced to evaluate the impact of Distribution Generator (DG) on radial distribution systems. On the way to allocate the DG, a hybrid between the Voltage Stability Index (VSI) and Whale Optimization Algorithm (WOA) is developed. The main purpose of using VSI is to find the most sensitive buses for allocating the DG in the system. Hence, Fuzzy logic control with the Normalized VSI (NVSI) and the voltage magnitude at each bus are used to determine the candidate buses. However, the best DG size is calculated using WOA. Four standard radial distribution systems are used in this paper; 12, 33, 69, and 85-bus. The developed hybrid optimization method is compared with other existing analytical and metaheuristic optimization techniques to prove its efficiency. The results prove the ability of the developed method in the allocation of DG. In addition, the influence of the DG integration on enhancing the voltage stability through injecting the proper active and reactive powers is studied.  a1989-1660