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Plug-in hybrid electric vehicles (PHEVs) involve the use of larger battery packs and larger electric drivetrain components than regular HEVs. The control and management of the vehicular power electronics and energy storage systems are therefore more complicated and more challenging than those in conventional HEVs. This tutorial will explore the different design and control requirements and challenges of PHEV drivetrain components. The tutorial will cover topics such as PHEV topology, control, design, performance optimization, battery management, battery cell balancing, battery life extension, and cold weather performance enhancement. Vehicle to grid (V2G) concepts will be discussed along with the system requirements and impact of PHEV on the power grid. Some OEM and aftermarket PHEVs, such as the Chrysler Aspen PHEV and Prius PHEV will be used as case studies.