Available at: http://digitalcommons.calpoly.edu/theses/893
Date of Award
MS in Electrical Engineering
This thesis proposes of an integrated two-stage V2G bidirectional power converter for the 2011 Chevy Volt’s EREV drivetrain. The power converter consists of a four switch bidirectional buck-boost DC-DC converter, 2-legged HB bidirectional DC-AC converter, and LCL grid filter. Designs in literature have integrated DC-AC converter via traction inverter, but this design also integrates DC-DC converter via modified secondary traction inverter. The proposed structure allows battery charging and V2G functionality to be integrated into existing electronics of the 2011 Chevy Volt; only the following additional components are needed: GFI, a few passive components, diodes, and relays. The converter structure is advantageous as cost, volume, and weight are minimized. Those factors are automakers main concerns. The proposed structure shows the feasibility of bringing V2G functionality to the mass market. Matlab Simulink was used to verify the design. Simulations were performed for high and low battery SOC to show voltage versatility, stiff and weak grid conditions to show filter robustness, and generator powering V2G to show topology DG capabilities. Results of simulations prove the topology to be promising as grid current has low distortion, almost meeting all IEEE 1547 current harmonic limit requirements.