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DC-Link Current Sensor-Less Average Current Mode Control for Series Stacked Buffer
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DOI：10.1109/ECCE50734.2022.9947883.png)
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Abstract
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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.
Keywords:
single-phase converters
second-harmonic ripple
series stacked buffer
dc-link current sensor-less
fixed-frequency switching
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