V2G Electrical Vehicle Quick Charger

2021 ELE Engineering Design Project (DX05)

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Faculty Lab Coordinator

David Xu

Topic Category

Power

Preamble

The battery chargers for EV is usually energy unidirectional from grid to vehicles. The EV can be considered as a larger energy storage device, which can be used to support the grid operation whenever additional energy sources are needed. To enable this technology, bi-directional battery charger are required. The charger convert the grid energy into DC and charge the battery. It can also be controlled to discharge the battery and support the grid when the grid is in peak demand.

Objective

The objective of this project is to design a bidirectional battery charger via simulation model.

Partial Specifications

The specifications of the battery charger are:
1) full power at 60kW (simulation model).
2) Three phase 420VAC input, 60Hz.
3) Nominal 340V DC output with charging capability up to 150A. The voltage range of charger is 200V to 420V
4) Energy bidirectional.
5) The grid side current THD<5%
6) Galvanic isolation between grid and battery

Suggested Approach

It is suggested to use three phase AC/DC converter plus bi-directional DC/DC converter with high frequency transformer for galvanic isolation. The group should study the dual active bridge with bi-directional AC-DC converter.

Group Responsibilities

The group should be responsible for project management, project demo and project reports.

Student A Responsibilities

Student A design the AC-DC converter circuit and test the PWM scheme.

Student B Responsibilities

Student B design the AC-DC converter controller based on the circuit by student A.

Student C Responsibilities

Student C design the dual-active bridge and test the control scheme.

Student D Responsibilities

Student D design the controller for dual active bridge (DAB) per the battery charging and discharging requirements.

Course Co-requisites

ELE754

To ALL EDP Students

Due to COVID-19 pandemic, in the event University is not open for in-class/in-lab activities during the Winter term, your EDP topic specifications, requirements, implementations, and assessment methods will be adjusted by your FLCs at their discretion.