Distribution System Feeder Re-Phasing Considering the Voltage Dependency of Loads
Abstract: Phase balancing creates voltage changes in the network that call for incorporating the voltage dependency of loads in the process. Hence, the inclusion of voltage-dependency in current-injection-based three-phase load flow is investigated, and the results are compared with the constant-power load model in terms of phase balancing.
The problem being combinatorial, the application of particle swarm optimization is investigated for the phase-balancing problem of a radial distribution network. The effects of phase unbalance and load representation are studied in terms of various parameters. It is observed that
- There are situations that lead to increase in losses despite improvement in phase-balancing.
- Re-phasing is sensitive to the voltage dependency of loads.
- Voltage improvement due to re-phasing increases the load demand.
- The system after re-phasing may suggest more MVA margins at the main substation if an appropriate load model is not considered.
- The system can be balanced substantially in terms of phase currents, phase voltages, and losses per phase by using PSO.
Bio: Rakesh Kumar Misra is a professor in the Department of Electrical Engineering, IIT (BHU) Varanasi. He received his B.Sc. (Engg.) degree in electrical engineering and M. Tech. degree in engineering systems from Dayalbagh Educational Institute, Agra, India, in 1995 and 1997, respectively, and his Ph.D. degree in electrical engineering from the Institute of Technology, Banaras Hindu University. His current research interest in the area of power distribution systems includes topics such as the effect of voltage dependency of load models on feeder reconfiguration, re-phasing, and distributed generation planning, and applications of computational intelligence in power systems.