DC-Link Current Sensor-Less Average Current Mode Control for Series Stacked Buffer

Mukhopadhyay, A and John, V (2022) DC-Link Current Sensor-Less Average Current Mode Control for Series Stacked Buffer. In: 2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022, 9 - 13 October 2022, Detroit.

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Abstract

Series-Stacked-Buffer has emerged as one of the most popular topologies for the second-harmonic power decoupling in single-phase converters. The use of low voltage devices in the buffer converter makes it a preferable choice in high power density applications. Conventionally, the buffer converter is operated in current control mode, realised with a hysteresis controller. However, it requires dc-link current sensing, which introduces parasitic inductance in the power loop. Moreover, hysteresis control poses several implementation and operational challenges due to the switching frequency variation. This work (i) eliminates the dc-link current sensor and (ii) implements an average current-mode control scheme that assures fixed switching frequency. An active damping loop is proposed in this work that reduces resonance oscillations and improves closed-loop stability. The paper elaborates on the current reference synthesis and controller design procedure which are validated through simulation and experimental results at 500 W power level. © 2022 IEEE.

Item Type:	Conference Paper
Publication:	2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to the Institute of Electrical and Electronics Engineers Inc.
Keywords:	Electric current control; Hysteresis; Phase control; Power converters; Power electronics, Current sensors; Dc link currents; Dc-link current sensor-less; Fixed frequency; Fixed-frequency switching; Frequency switching; Second harmonics; Second-harmonic ripple; Sensorless; Series stacked buffer; Single phase converter, Controllers
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	25 Jan 2023 09:37
Last Modified:	25 Jan 2023 09:37
URI:	https://eprints.iisc.ac.in/id/eprint/79509

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