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Harmonic emissions have been changed in distribution networks, with respect to frequency range and magnitude, due to the penetration of modern power electronics systems. Two new frequency ranges 2–9 and 9–150 kHz have been identified as new disturbing frequency ranges affecting distribution networks. This paper presents the effects of grid-connected three-phase systems with different front-end topologies:...
This paper presents effects of DC link capacitor sizes in a three phase diode rectifier on input current harmonics at a system level. A small DC link capacitor generates a resonant frequency with a line inductor which can affect and increase the input current harmonics. According to IEC 61000-3-2 and IEC 61000-3-12 standards, low order current harmonics of a power electronic system should be controlled...
This paper presents theoretical, simulation, and experimental investigations of input current interharmonics in modern variable-speed drives based on voltage source inverters and diode input rectifiers that are caused by motor current imbalance. It investigates how a disturbance in the inverter dc side current created by unbalanced motor currents propagates from the inverter to the rectifier stage...
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