A Multi-Constraint-Adhered Coordinated-Control Algorithm for Solar-Plant Integrated Futuristic Electric-Vehicle Ultra-Fast Charging-Station

Abstract

Though battery-less solar-plant integrated ultra-fast charging station (EV-UFCS) solutions are theoretically preferred, there is no existing control method that simultaneously ensures solar-plant’s MPPT and maximum charging energy delivery to plug-in EVs (PEVs), while adhering to instantaneous grid-side power-ramp-rate and each PEV’s charging current limits. A novel coordinated-control technique is proposed in this paper to meet these critical objectives, while being constrained by the instantaneous grid-side and PEV-side limits. The theoretical modelling and an implementable algorithm for the proposed control technique are elaborately explained. Experimental validation of the proposed technique is executed on a laboratory-scale 18 kVA solid-state-transformer (SST)-based solar-aided universal EV-UFCS testbed. The experimental results clearly demonstrate that (i) solar MPPT is achieved with >99% accuracy, (ii) ~100% of maximum charging energies are delivered to all categories of connected PEVs, and (iii) instantaneous grid power-ramp-rate and PEV-BMS constraints are strictly adhered to, which highlight the proposed coordinated-control technique’s advantages.