An Asymmetric Selective Harmonic Current and Voltage Modulation-PWM Technique for Electric Vehicle Charging Stations with Cascaded H-Bridge Converters to Meet Power Quality Standards

摘要

The requirements of the power quality harmonic standards (such as voltage and current harmonic requirements) should be met by electric vehicle charging stations. Reaching these goals is more difficult when the grid has a week impedance. Also, it is important to use a low-switching frequency modulation technique for high-power applications to reduce the switching losses of the grid-tied converters. In this paper, a low-frequency asymmetric selective harmonic current and voltage modulation-PWM (ASHCVM-PWM) is introduced to meet both voltage and current harmonic requirements of the grid-tied converters at the point of common coupling (PCC), when the grid has a weak impedance with or without nonlinear loads. To validate the advantages of the proposed ASHCVM-PWM technique than the conventional asymmetric selective harmonic current mitigation-PWM (ASHCM-PWM) technique, simulation, and experimental results are conducted on a 3-cell 7-level CHB converter.