Control Strategy for Electric Vehicle Charging Station Power Converters with Active Functions

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.

A Hierarchical V2G/G2V Energy Management System for Electric-Drive-Reconstructed Onboard Converter

“…To meet the control objectives, the given of the observed variable is set to zero vector. The PEV under the aggregator gets the weight function used to allocate power as shown in equation (18) and the active power reference for each PEV is shown in equation (19). where, ( ) is the power weight function allocated by the PEV n at time slot k which is regulated by the deviation of PEV and the power balance parameter; η is the power balance parameter which adjusts the range of the active power reference.…”

“…For the vehicle-level control strategy, the P-Q theory is used to control the active power and reactive power, respectively. In G2V mode, the PEV converter extracts active power from the grid to charge the battery; In V2G mode, the PEV battery provides active power to the grid through the converter [19]. For the V2G/G2V system works with the microgrid, the adaptive droop control based on the state of charge (SOC) is proposed in [20] and [21].…”

Honey badger optimized energy management in grid connected solar PV battery for enhancing the stability and power quality

“…In most literature, fuzzy logic (FL) based controllers are adopted to improve the charging and discharging of batteries. In such methods, the FL is applied to take control measures under the SOC of a battery 12 . Additionally, the proportional‐integral (PI) is used along with FL for the converters to improve the system stability 13 .…”

“…In such methods, the FL is applied to take control measures under the SOC of a battery. 12 Additionally, the proportional-integral (PI) is used along with FL for the converters to improve the system stability. 13 From the view of PQ, EV should minimize the harmonics to improve the PQ.…”

Research on Reactive Power Compensation Control of V2G Vehicle-Mounted Converter Suitable for Sharing Scenarios

“…Electrically driven reconfigurable on-board converter (EDROC) operates at LEVEL 1 and LEVEL 2 power levels [12,13]. EDROC achieves size reduction and power density increase by using drive motor of drive system in V2G mode instead of charging inductor.…”