Solid-State Single-Port Series Damping Device for Power Converters in DC Microgrid Systems

Ke-Wei Wang; Xin Zhang; Henry Shu-Hung Chung

doi:10.1109/TPEL.2018.2811941

Solid-State Single-Port Series Damping Device for Power Converters in DC Microgrid Systems

Ke-Wei Wang
, Xin Zhang
, Henry Shu-Hung Chung^*

^*Corresponding author for this work

Centre for Smart Energy Conversion and Utilization Research

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

18 Citations (Scopus)

Abstract

IIn DC microgrid systems, power converters with input filters sometimes encounter unwanted input voltage and current oscillations, due to interactions among the bus impedance, filters, and converters. This paper presents a solid-state single-port series damper (“S³ damper”) that can deal with such oscillations. The damper, which is connected in series between the input filter and the converter, is realized by operating a transistor as an AC resistor. It lowers the quality factor of the filter and thus increases the damping effect on the interaction between the filter and converter. It also increases the input impedance of the filter to avoid voltage and current oscillation between the filter and the bus. In addition, the transistor is regulated at a low dropout voltage to reduce power dissipation. The control mechanism is autonomous. Furthermore, the proposed damper does not require any power capacitor or inductor, favoring high compactness and reliability. Modeling, design, and comprehensive analysis of the S³ damper will be provided. A prototype damper for a commercially available 100W DC-DC converter operated on a 48V bus has been built and evaluated.

Original language	English
Pages (from-to)	192-203
Journal	IEEE Transactions on Power Electronics
Volume	34
Issue number	1
Online published	8 Mar 2018
DOIs	https://doi.org/10.1109/TPEL.2018.2811941
Publication status	Published - Jan 2019

Funding

Manuscript received October 14, 2017; revised January 10, 2018; accepted February 15, 2018. Date of publication March 8, 2018; date of current version November 19, 2018. This work was supported by the City University of Hong Kong under Project #7004621. This paper was presented in part at the IEEE 3rd International Future Energy Electronics Conference and ECCE Asia, June 3–7, 2017. Recommended for publication by Associate Editor G. Konstantinou. (Corresponding author: Henry Shu-Hung Chung.) K.-W. Wang and H. S.-H. Chung are with the Centre for Smart Energy Conversion and Utilization Research, City University of Hong Kong, Kowloon Tong, Hong Kong (e-mail:,[email protected]; [email protected]).

Research Keywords

damping device
DC microgrids
stability

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title = "Solid-State Single-Port Series Damping Device for Power Converters in DC Microgrid Systems",

abstract = "IIn DC microgrid systems, power converters with input filters sometimes encounter unwanted input voltage and current oscillations, due to interactions among the bus impedance, filters, and converters. This paper presents a solid-state single-port series damper (“S3 damper”) that can deal with such oscillations. The damper, which is connected in series between the input filter and the converter, is realized by operating a transistor as an AC resistor. It lowers the quality factor of the filter and thus increases the damping effect on the interaction between the filter and converter. It also increases the input impedance of the filter to avoid voltage and current oscillation between the filter and the bus. In addition, the transistor is regulated at a low dropout voltage to reduce power dissipation. The control mechanism is autonomous. Furthermore, the proposed damper does not require any power capacitor or inductor, favoring high compactness and reliability. Modeling, design, and comprehensive analysis of the S3 damper will be provided. A prototype damper for a commercially available 100W DC-DC converter operated on a 48V bus has been built and evaluated.",

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Y1 - 2019/1

N2 - IIn DC microgrid systems, power converters with input filters sometimes encounter unwanted input voltage and current oscillations, due to interactions among the bus impedance, filters, and converters. This paper presents a solid-state single-port series damper (“S3 damper”) that can deal with such oscillations. The damper, which is connected in series between the input filter and the converter, is realized by operating a transistor as an AC resistor. It lowers the quality factor of the filter and thus increases the damping effect on the interaction between the filter and converter. It also increases the input impedance of the filter to avoid voltage and current oscillation between the filter and the bus. In addition, the transistor is regulated at a low dropout voltage to reduce power dissipation. The control mechanism is autonomous. Furthermore, the proposed damper does not require any power capacitor or inductor, favoring high compactness and reliability. Modeling, design, and comprehensive analysis of the S3 damper will be provided. A prototype damper for a commercially available 100W DC-DC converter operated on a 48V bus has been built and evaluated.

AB - IIn DC microgrid systems, power converters with input filters sometimes encounter unwanted input voltage and current oscillations, due to interactions among the bus impedance, filters, and converters. This paper presents a solid-state single-port series damper (“S3 damper”) that can deal with such oscillations. The damper, which is connected in series between the input filter and the converter, is realized by operating a transistor as an AC resistor. It lowers the quality factor of the filter and thus increases the damping effect on the interaction between the filter and converter. It also increases the input impedance of the filter to avoid voltage and current oscillation between the filter and the bus. In addition, the transistor is regulated at a low dropout voltage to reduce power dissipation. The control mechanism is autonomous. Furthermore, the proposed damper does not require any power capacitor or inductor, favoring high compactness and reliability. Modeling, design, and comprehensive analysis of the S3 damper will be provided. A prototype damper for a commercially available 100W DC-DC converter operated on a 48V bus has been built and evaluated.

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KW - DC microgrids

KW - stability

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Solid-State Single-Port Series Damping Device for Power Converters in DC Microgrid Systems

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