Author Chivon Choeung
Seoul National University of Science and Technology -SOUTH KOREA
Abstract
A Study on Robust Tracking Control of a Three-phase
Bidirectional Charger for Electric Vehicle
Chivon Choeung
(Supervised by Professor Young-Il Lee)
Department of Electrical and Information Engineering
Graduate School
Seoul National University of Science and Technology
This thesis presents a robust control strategy of a three-phase off-board
bidirectional AC-DC battery charger for electric vehicle. The conventional
constant current (CC) and constant voltage (CV) charging mode is considered to
provide a fast charging performance for the batteries. The bidirectional charger
also allows to use the full electric vehicle as an energy storage system for the
electric grid, charging the in the peak-off times and delivering the energy back
to the grid in peak times of electrical consumption. In discharging mode, the
bidirectional charger maintains constant active power flow to grid with a given
reference. The proposed control consists of inner-loop robust control and
outer-loop conventional PI control. For the inner-loop robust control, a state
feedback controller with integral action is employed in dq-synchronous frame.
The set of stabilizing gains of this controller are determine by a Linear Matrix
Inequality (LMI)-based optimization so that the convergence time to steady stead
is minimized in the occurrence of the parametric uncertainties of the L-filter.
The efficacy of the proposed controller is verified through simulation and
experimental results on 102.4V Lithium iron phosphate (LiFePO4) batteries.
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