This paper reports the results of an extensive series of computer simulations of electric vehicle battery chargers. It clearly illustrates that both the power factor and the harmonic pollution that is injected into the distribution system are dependent upon the method of current control. In certain cases, an inductor in series with the battery is the most economical method of current control, but leads to a poor lagging power factor. Conduction angle control by firing angle control with natural extinction results in a poor lagging power factor. However, natural firing with forced extinction results in a leading power factor. Harmonic components appear in conjugate phase relationship with these two schemes. This suggests the possibility of controlling both the power factor and harmonics by a suitable mix of chargers. Conducting angle control by symmetric switching about voltage peaks yields unity power factor, but may yield high harmonics. A special case with a conduction angle of 120 degrees eliminates third and ninth harmonics with near minimum total harmonic injection.
Current control in EV battery chargers and its effect on distribution system harmonics and power factor
Stromregelung in Batterieladegeraeten fuer elektrisch angetriebene Fahrzeuge und sein Einfluss auf die Harmonischen der Verteilungssysteme und auf den Leistungsfaktor
IEEE Electronicom '85 ; 1 ; 252-255
1986
4 Seiten, 3 Bilder, 1 Tabelle, 5 Quellen
Conference paper
English
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