Abstract:With the ongoing large-scale implementation of electric vehicles (EVs), the exploration of a more flexible approach to maintain fair interaction between EVs and the power grid is urgently required. This paper presents an aggregator-based interactive charging management scheme adopting interruptible load (IL) pricing, in which the EV aggregator will respond to the load control command of the grid in an EV interactive mode. Charging managements are carried out according to battery state-of-charge and the EV departure time in EV charging stations. A power-altering charging (PAC) control method is proposed to dispatch the EVs charging fairly in a station and guarantee EV owners' preferences. The method does not require classical iterative procedures or heavy computations; furthermore, it is beneficial for EVs to depart earlier than expected for reasons beyond keeping homeostatic charging. The proposed scheme, which is tested to charge individual EVs well according to its preference, was implemented as part of an "EV Beijing" project. The proposed management scheme provides new insight into EV charging strategy and provides another choice to EV users.
Power grids will benefit when electric vehicle (EV) charging stations provide more services in addition to charging. This paper presents a new configuration of the unified power quality conditioner (UPQC) that uses a microgrid in an EV charging station. A double‐layer direct current structure is used in the microgrid to connect EVs in parallel and restrain direct current voltage variations in the UPQC. Control of the UPQC is modified to address the charging of EVs by using power from the grid directly while compensating for power quality issues. Recommended control parameters for the UPQC are derived from small signal analysis. An equal time ratio discharging control for EVs is proposed when a charging station UPQC acts as an emergency power supply to compensate for power interruptions. The performance of the proposed system was analyzed through simulations. Results show that the proposed system can compensate for harmonics, voltage sag and swell, voltage unbalance, and voltage interruption while ensuring EV charging.
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