Impact of V2G on substation capacity and SVR devices for Radial Distribution network

The unpredictable nature of load demands at load centers will become more salient as V2G penetration increases. In this paper, the impact of V2G parking lots on substation power capacity and step voltage regulators (SVR) operations are investigated. A plethora of various operational scenarios are investigated with the aim to make credible and factual research-based finding. IEEE 13 and IEEE 123 Node test feeder networks were modeled in Radial Distribution Analysis Package (RDAP). The load flow results provided information on V2G impacts on substation power capacity, and on SVR operations. Results show that for a given V2G penetration level, the impact of 3-phase V2G integration on the measurable indices (substation power capacity and SVR operations) results in an improved system impact than 1-phase V2G integration. It was also observed that system-wide penetration of the V2G facilities will lead to acceptable system performance, provided that near-balanced operation is maintained and system capacity is not exceeded. Results also show that high penetration of V2G in the distribution network may mean upgrading of the existing substation capacity, although careful planning and operational strategies may relieve the system facilities, and hence delay the time for sub-station upgrade. The results will be useful in distribution system planning.