Abstract
This paper presents the design and control methods of a single-phase bidirectional on-board charger (OBC) using a hybrid starter generator (HSG) and an inverter in a hybrid electric vehicle (HEV). In an HEV, there are a number of components, including the combustion engine, transmission, traction motor, motor controller, OBC, and HSG system. The proposed design reconfigures the HSG system to provide battery-charging capability instead of a conventional OBC based on the use of additional power relays. As a result, the number of power converters is effectively reduced through the replacement of the conventional OBC, and, thus, the power density is increased. This paper also proposes a control method for enabling not only battery charging but also a reactive power support depending on the grid command. Compared with a conventional reactive power compensation method, the proposed method has an advantage because it is located near the principal reactive power source. The simulation and experimental results verify the validity and feasibility of the proposed bidirectional OBC design and its control methods.
Highlights
With growing concerns regarding environmental contamination and global warming, a principal conversion of innovative technology has occurred, moving from conventional internal combustion engine (ICE) powered vehicles to more energy-efficient vehicles, including electric vehicles (EVs) and hybrid EVs (HEVs)
Because a battery acts as a load in the simulations conducted, the load side resistance was set at 20 Ω based on the rating of the on-board charger (OBC)
This paper proposed the design and control method of a single-phase bidirectional OBC using
Summary
With growing concerns regarding environmental contamination and global warming, a principal conversion of innovative technology has occurred, moving from conventional internal combustion engine (ICE) powered vehicles to more energy-efficient vehicles, including electric vehicles (EVs) and hybrid EVs (HEVs). There are still technical limitations to the active use of pure EVs, including a lack of charging infrastructure and a limited driving range owing to low battery performance. HEVs can be a compromise compensating the limitations of conventional ICE-powered vehicles and EVs [1,2,3,4,5]. Owing to the use of dual power sources, HEVs are composed of various mechanical and electrical components, such as a combustion engine, electrical traction motor, transmission, battery, power converters, and battery charger (OBC).
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