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Title: Power Supply, Protection, and Harmonic Analysis for an Electric Vehicle Charging System in a Large Parking Deck
Authors: Hutchinson, Shane Robert
Advisors: Mesut Baran, Committee Chair
Srdjan Lukic, Committee Member
Wenye Wang, Committee Member
Keywords: ev
power supply
parking deck
Issue Date: 17-Feb-2010
Degree: MS
Discipline: Electrical Engineering
Abstract: This thesis presents a power delivery architecture for an Electric Vehicle (EV) and Plug-in Hybrid Electric Vehicle (PHEV) charging system to be implemented in a parking deck for consumer use. The main design issues for this topic are covered, including the characterization of the PHEV and EV load using simulations, the layout of the power supply circuit, the sizing of cables and transformers, and electrical protection. The National Electrical code is used to size the equipment, following the guidelines of the IEEE Recommended Practice for Electric Power Systems in Commercial Buildings. The transformer is sized by a statistical analysis with the Monte Carlo method of the expected power by looking at the arrival times and initial states of charge of the vehicle batteries connected to the system. Included in this design is a current harmonic analysis of the HEV Toyota Prius with a Hymotion plug-in aftermarket kit and the Progress Energy Ford Escape PHEV. The NC State ATEC charger is also analyzed in software to get a comparison of the charger topologies. The harmonic current analysis and its effects on the transformer rating are discussed. The harmonic phase cancellation phenomenon is studied for the charging system, where current harmonics for multiple chargers connected to the same system are phase shifted from one another, resulting in a lesser value for the total distortion than the strict arithmetic sum of the harmonic current magnitudes. Final results are obtained by using the Monte Carlo method to apply a derating factor for the transformer in accordance with the IEEE C57.110 Standard.
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