Abstract
This paper presents the design and implementation of a single-phase multifunctional electric-vehicle (EV) on-board charger with an advanced vehicle-to-vehicle (V2V) functionality for emergency roadside charging assistance situations. Using this function, an EV is able to charge from another EV in case of an emergency when the battery is flat and there is no access to a charging station. The designed EV charger can support the proposed V2V function with rated power and without the need for an additional portable charger. It can also provide conventional functions of vehicle-to-grid (V2G), grid-to-vehicle (G2V), the static synchronous compensators (STATCOM) and active power filter (APF) (i.e. reactive power support, and harmonics reduction). All the functions are addressed in the control part through the sharing of existing converters in an all-in-one system. The proposed EV charger is designed and simulated in MATLAB/Simulink, and a laboratory prototype is also implemented to validate its key functions.
Highlights
The number of plug-in electric vehicles (EVs) is growing rapidly in developed countries and, they have drawn widespread attention due to their various potential functions on the grid [1]
The proposed V2V function is addressed in the control part, no additional converter needs to be added to the EV charger
We evaluate the performance of the proposed EV charger (EVa), while the front-end converter of the charger operates as a voltage source converter to provide the grid-connected functions of V2G/G2V, STATCOM and active power filter (APF) as Functions II, III and IV of the proposed EV charger
Summary
The number of plug-in electric vehicles (EVs) is growing rapidly in developed countries and, they have drawn widespread attention due to their various potential functions on the grid [1]. A single-phase EV charger is utilized to address the main functions as well as three ancillary functions (reactive power support, harmonics reduction and voltage regulation) simultaneously [17]. The EV operates as an uninterruptible power supply (UPS) that is off-line during the grid-connection mode and on-line during the gridisolated mode In another approach, the EV charger can perform a traction-to-auxiliary (T2A) battery function. The V2V operation can be accomplished with the maximum power ratio of the EV charger since the same charging infrastructure is used for transmitting the power between the EVs. The proposed V2V function is addressed in the control part, no additional converter needs to be added to the EV charger. To present a complete design, the proposed EV charger is utilized to cover the conventional grid-connected functions such as G2V, V2G, reactive power support, harmonics reduction and voltage regulation for a household network. This converter can be utilized to operate as either a dc-ac converter in V2V operation [Function I] or as a dcac converter during the grid-connected mode to provide G2V and V2G operation [Function II] as well as ancillary functions of STATCOM and/or APF [Functions III and IV]
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