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

In 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 (" S 3 damper") that can deal...

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Published inIEEE transactions on power electronics Vol. 34; no. 1; pp. 192 - 203
Main Authors Wang, Ke-Wei, Zhang, Xin, Chung, Henry Shu-Hung
Format Journal Article
LanguageEnglish
Published New York IEEE 01.01.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Damping
damping device
Data buses
DC microgrids
Distributed generation
Electric potential
Impedance
Input impedance
Microgrids
MOSFET
Oscillations
Power converters
Q factors
Reliability analysis
Resistance
Resistors
Shock absorbers
Solid state
stability
Transistors
Online AccessGet full text
ISSN0885-8993
1941-0107
DOI10.1109/TPEL.2018.2811941

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Abstract In 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 (" S 3 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 the 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 S 3 damper will be provided. A prototype damper for a commercially available 100 W dc-dc converter operated on a 48 V bus has been built and evaluated.
AbstractList In 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 (" S 3 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 the 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 S 3 damper will be provided. A prototype damper for a commercially available 100 W dc-dc converter operated on a 48 V bus has been built and evaluated.
In 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 (“ S 3 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 the 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 100 W dc–dc converter operated on a 48 V bus has been built and evaluated.
Author Zhang, Xin
Chung, Henry Shu-Hung
Wang, Ke-Wei
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SubjectTerms Damping
damping device
Data buses
DC microgrids
Distributed generation
Electric potential
Impedance
Input impedance
Microgrids
MOSFET
Oscillations
Power converters
Q factors
Reliability analysis
Resistance
Resistors
Shock absorbers
Solid state
stability
Transistors
Title Solid-State Single-Port Series Damping Device for Power Converters in DC Microgrid Systems
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