In order to improve the Voltage Stability Index (VSI), real and reactive power loss compensation, there is a solution in terms of Distributed Generation (DG). By incorporating DGs at proper location with suitable size, the power losses will reduce and there is an improvement of voltage profile. For this a new approach was introduced which is a hybridization of Firefly Algorithm (FA) with Gravitational Search Algorithms (GSA). After finding the real power losses using conventional method like Backward/Forward (BW/FW) sweep approach, the new approach was implemented to prove that it was the better algorithm than the other approaches. All these approaches have been implemented on standard IEEE-33 radial test system. MATLAB software was used to simulate the results and to find optimal DG sizing and siting on IEEE-33 test system.
backward/forward sweep analysis, gravitational search algorithm approach, firefly algorithm, power losses
 Biswas S, Goswami SK, Chatterjee A. (2012). Optimum distributed generation placement with voltage sag effect minimization. An International Journal of Energy Conversion and Management 53: 163–174.
 Georgilakis PS, Hatziargyriou ND. (2013). Optimal distributed generation placement in power distribution networks: Models, methods, and future research. IEEE Transactions on Power Systems 28(3): 3420-3428.
 Soudi S. (2013). Distribution system planning with distributed generations considering benefits and costs. International Journal of Modern Education and Computer Science (IJMECS) 5(9): 45.
 Khairuddin Azhar SB, Aman MM, Mokhtar AS, Zareen N. (2016). A review of optimum DG placement based on minimization of power losses and voltage stability enhancement of distribution system. An International Journal of Renewable and Sustainable Energy Reviews 63: 363–378.
 Sekhar GC, Sahu RK, Baliarsingh AK, Panda S. (2016). Load frequency control of power system under deregulated environment using optimal firefly algorithm. International Journal of Electrical Power & Energy Systems 74: 195-21.
 Wang CS, Song GY, Li P, Ji HR, Zhao JL, Wu JZ. (2017). Optimal siting and sizing of soft open points in active electrical distribution networks. An International Journal of Applied Energy 189: 301–309.