Abstract
Based on the assumption that vehicles served by petrol stations will be replaced by Electric Vehicles (EV) in the future, EV public charging station facilities, with off-board fast chargers, will be progressively built. The power demand of these installations is expected to cause great impact on the grid, not only in terms of peak power demanded but also in terms of power quality, because most battery chargers behave as non-linear loads. This paper presents the proposal of a novel comprehensive global control strategy for the power electronic converters associated with bidirectional three-phase EV off-board fast chargers. The Charging Station facility Energy Management System (CS-EMS) sends to each individual fast charger the active and reactive power setpoints. Besides, in case the charger has available capacity, it is assigned to compensate a fraction of the harmonic current demanded by other loads at the charging facility. The proposed approach works well under distorted and unbalanced grid voltages. Its implementation results in improvement in the power quality of each fast charger, which contributes to improvement in the power quality at the charging station facility level, which can even provide ancillary services to the distribution network. Simulation tests are conducted, using a 100 kW power electronic converter model, under different load and grid conditions, to validate the effectiveness and the applicability of the proposed control strategy.
Highlights
Electric vehicles (EV) represent the most likely successor to conventional internal combustion engine vehicles
The control strategy generates the reference currents, i∗ch, which must be provided by fast chargers (FC), in such a way that (i) active and reactive power setpoints sent by the Charging Station facility Energy Management System (CS-EMS) are satisfied, and (ii) harmonic and unbalanced currents demanded by the other loads connected at the Point of Common Coupling (PCC) are compensated
Soon there is no reactive power setpoint provided from the CS-EMS and only the P control is activated
Summary
Electric vehicles (EV) represent the most likely successor to conventional internal combustion engine vehicles. ItEV cannot work charger can operate both as a static synchronous compensator and as an active power well under unbalanced and distorted grid voltages and cannot perform the phase balancing function. It compensates the validated, which allows a single-phase charger to operate simultaneously with an active (P mode) load current harmonics (H mode), in all the cases, under normal and abnormal grid conditions. The and reactive (Q mode)[27] It compensates theto load current harmonics (H mode), in all authors in Reference apply a synchronverter strategy a charging station, which can provide the cases,services under normal and abnormal grid. Power reserves, well asinsupply or absorb reactive synchronverter strategy to a charging station, which can provide ancillary services such as frequency power It cannot provide H control and does not work properly under a disturbed grid.
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