Probabilistic Modeling of PHEV Load and Its Impacts in Unbalanced Distribution System with D-STATCOM

To minimize global warming effect and carbon emission impacts, plug-in hybrid electric vehicles (PHEVs) are becoming popular now-a-days as an alternative to conventional vehicles. As PHEVs are charged from existing grid, so planning and analysis should be done properly for integration. In this paper, the impact of assimilating PHEV in the distribution network in terms of all the technical factors such as voltage profile, line loss, voltage unbalance is analysed. Taking into account the uncertainty of PHEV load, the 24 hour power demand curve of PHEVs is developed which is probabilistic in nature. Then PHEVs are incorporated with residential load in the IEEE-13 bus system. Here the hourly load flow for unbalanced distribution system is performed in OpenDSS (version 9.4.0.1) software interfaced with MATLAB (version 2018a) software. It was observed that increase in penetration level of PHEVs leads to violation of security constraints in terms of voltage profile and voltage unbalance. The performance parameters are studied for different penetration levels of PHEVs. In order to increase the penetration level of PHEV in the distribution system, FACTS devices such as DSTATCOMs are incorporated in the existing system and the results were compared and analyzed.