High-Precision Active Suppression of DC Bias in AC Grids by Grid-Connected Power Converters | IEEE Journals & Magazine | IEEE Xplore

High-Precision Active Suppression of DC Bias in AC Grids by Grid-Connected Power Converters


Abstract:

Increased dc injection from grid-connected power converters and an increased dc-bias sensitivity of recent distribution transformers require unprecedented precision in de...Show More

Abstract:

Increased dc injection from grid-connected power converters and an increased dc-bias sensitivity of recent distribution transformers require unprecedented precision in detecting and suppressing the dc bias in 0.4-kV ac grids. In this paper, an optimum design of the dc-bias sensing reactor is devised, along with a robust, simple-touse sensing algorithm that does not require calibration or tuning. The sample sensors are used as feedback devices within an experimental setup comprising a three-phase grid-connected inverter and a novel dc-bias suppression algorithm. The steady-state dc bias is suppressed below 65 μV, the level acceptable even with the most sensitive distribution transformers.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 64, Issue: 1, January 2017)
Page(s): 857 - 865
Date of Publication: 15 March 2016

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