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The unbalanced condition of typical loads in industrial networks could affect the current harmonics across the dc-link in Adjustable Speed Drives (ASDs). These current harmonics could pass through the dc-link and create new current harmonics at the grid side. Thus, the effect of unbalanced-load condition on the current harmonics across the dc-link needs to be considered in the design process. Moreover, new compatibility levels and emission limits will be developed for the 2&#x2013;9 kHz current harmonics, so drives need to meet these new requirements in future. These current harmonics could also be significantly affected by the load power factor at the unbalanced-load condition. Due to these reasons, analysing the effect of unbalanced-load and load power factor on the current harmonics between 0 to 9 kHz across the dc-link is vital. Thus, this paper presents an analytical approach for estimating the current harmonics of the inverter at the dc side considering unbalanced-load currents. The proposed mathematical equations are then validated with experimental results. These analyses reveal that the negative-sequence current generates new harmonics across the dc-link. Additionally, the relationship between unbalanced currents at the load side and dc-link are found as a function of positive- and negative-sequence currents.

Analysis of 0–9 kHz Current Harmonics in a Three-Phase Power Converter Under Unbalanced-Load Conditions