Integration of solar photovoltaics and electric vehicles in residential grids

In the last few years, there is an increased penetration of solar photovoltaic (SPV) units in low voltage (LV) distribution grids. Also electric vehicles (EVs) are introduced to these LV networks. This has caused the distribution networks to be more active and complex as these local generation and load units are characterised by unpredictable and diverse operating characteristics. This paper analyses the combined effect of SPVs and EVs in LV Danish residential grids. The EVs charging needs based on typical driving patterns of passenger cars and SPV power profiles during winter/summer days are used to determine any resultant grid congestions. Simple grid reinforcement measures like modifying feeder layouts are applied in this work to verify improvements in grid bottlenecks. The results of the analyses show that the SPV and EV combination can complement each other in improving the grid voltage profiles, especially during the high demand hours in summer.