Ripple reduction of DC current sources in three-level CE-CSI circuits using single core inductors

Abstract

Abstract Current source inverter operates producing a predetermine ac current from dc current inputs. In practical, ac current waveform will have harmonic contents appeared in the frequency spectrum. Some factors may affect these harmonics contents such as voltage drops occurred in the power devices of controlled power switches, and voltage drops caused by the resistances of power inductor and conductor. The dc current sources usually generated by using power inductors connected to dc power source. Another factor that can escalate the harmonics is the current ripples of dc current sources. To regulate the dc current sources flowing in the inductor, controlled switches and current controller are required. This paper proposed a novel strategy to minimized current ripple of inductors by applying single core inductors. Some test results of computer simulation were presented in the paper.