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Active Power Decoupling Design of a Single-Phase AC–DC Converter

School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
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Author to whom correspondence should be addressed.
Electronics 2019, 8(8), 841; https://doi.org/10.3390/electronics8080841
Received: 12 June 2019 / Revised: 19 July 2019 / Accepted: 22 July 2019 / Published: 27 July 2019
(This article belongs to the Special Issue Advanced Power Conversion Technologies)
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PDF [8378 KB, uploaded 27 July 2019]
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Abstract

The second-order ripple power of single-phase converter causes second-order ripple voltages on the DC bus. For eliminating second-order ripple components, passive power decoupling methods including DC bus electrolytic capacitors have some shortcomings, such as low power density and poor stability of converters. Thus, an active power decoupling method based on a single-phase converter is proposed in this paper. The control method, taking single-phase voltage source pulse width modulation (PWM) rectifier (single-phase VSR) as the basic converter and adopting a buck-boost power decoupling circuit, introduces second-order ripple of DC bus voltage into a power decoupling circuit. The ripple acts as compensation of the phase deviation between the command value and the actual value of the second-order ripple current. Therefore, estimation of the second-order ripple current is more accurate, the power decoupling circuit absorbs the second-order ripple power behind the H-bridge more completely, and the DC bus voltage ripple is effectively suppressed accordingly. Finally, experimental results of the single-phase VSR are given to verify the validity of the proposed method. View Full-Text
Keywords: single-phase converter; active power decoupling; second-order ripple reduction; DC bus voltage single-phase converter; active power decoupling; second-order ripple reduction; DC bus voltage
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Qiu, M.; Wang, P.; Bi, H.; Wang, Z. Active Power Decoupling Design of a Single-Phase AC–DC Converter. Electronics 2019, 8, 841.

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