Abstract
This paper presents the control and simulation of an electric vehicle (EV) charging station using a three-level converter on the grid-side as well as on the EV-side. The charging station control schemes with three-level AC/DC power conversion and a bidirectional DC/DC charging regulator are described. The integration of EVs to the power grid provides an improvement of the grid reliability and stability. EVs are considered an asset to the smart grid to optimize effective performance economically and environmentally under various operation conditions, and more significantly to sustain the resiliency of the grid in the case of emergency conditions and disturbance events. The three-level grid side converter (GSC) can participate in the reactive power support or grid voltage control at the grid interfacing point or the common coupling point (PCC). A fuzzy logic proportional integral (FL-PI) controller is proposed to control the GSC converter. The controllers used are verified and tested by simulation to evaluate their performance using MATLAB/SIMULINK. The comparison of a PI-controller and a PI-Fuzzy controller for the EV charging station shows the effectiveness of the proposed FL-PI controller over conventional PI controller for same circuit operating conditions. A good performance for PI-Fuzzy in terms of settling time and peak overshoot can observed from the simulation results.
Highlights
Electric vehicles (EV) became popular, and building EV charging stations is important in order to fulfill the electrical energy demand of the vast number of electric vehicles.Nowadays, due to the widespread accessibility of electrical grids, parking lots, fast EV charger stations, and residential areas can offer the electrical energy required to charge EVs
AC/DC inverter/converter is controlled by keeping a constant voltage voltage and regulating reactivereactive power power supplied to/ delivered from the grid bygrid the by three-phase threeDC-bus and regulating supplied to/ delivered from the the three-phase level (TPTL)
Case 2: If the current reference Iref > 0 and the EV battery state of charge (SOC) is below 70%, the switch is in the bottom position, and the EV-side converter operates in the condition of constant current charging
Summary
Electric vehicles (EV) became popular, and building EV charging stations is important in order to fulfill the electrical energy demand of the vast number of electric vehicles. Three-phase bidirectional multilevel converters are recommended for high-power charger systems in spite of the added complexity of control circuitry and additional components, which can increase the total cost [12] These converters are characterized by a high level of power quality at AC input mains with reduced total harmonic distortion (THD), higher power factor, reduced electromagnetic interference (EMI) noise, and provide a ripple-free, regulated DC output voltage insensitive to both supply and load disturbances [13,14,15,16,17,18].
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