Abstract
Analysis of 0–9 kHz Current Harmonics in a Three-Phase Power Converter Under Unbalanced-Load Conditions
Highlights
I NVERTERS have been applied in many applications with the significant advances in the power electronic technologies
This article investigates the impact of an unbalanced-load condition on 0-9 kHz current harmonics across dc-link in an Adjustable Speed Drive (ASD)
The impact of unbalanced currents on the current harmonics of inverter at the dc side is analysed by employing the proposed equation. These analyses reveal that new current harmonic orders are generated between 0-2 kHz when load is unbalanced
Summary
I NVERTERS have been applied in many applications with the significant advances in the power electronic technologies. It is worth mentioning that only a three-phase inverter was considered in [26] rather than an ASD They have not considered the impact of load power factor variations and positive- and negative-sequence currents on the 2-9 kHz current harmonics of iinv. After validating the accuracy of this analytical approach with simulation and practical results, the effect of different parameters on the current harmonics of iinv is investigated These analyses reveal that a new current harmonic at double the fundamental frequency is generated between 0-2 kHz when the load is unbalanced. The contribution of the proposed equation is that the current harmonics across dc link can be estimated up to 9 kHz at an unbalanced-load condition This helps to estimate the current harmonics at the input of an ASD with different filter configurations and grid conditions when the load is unbalanced.
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