Active damping method to reduce the output impedance of the DC–DC converters

Li, Yan; Jia, Pengyu; Zheng, Trillion Q.

doi:10.1049/iet-pel.2013.0911

Cited by 12 publications

(9 citation statements)

References 20 publications

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“…1, the FS DAB converter behaves like a source with equivalent output impedance notated as Z F,o when power flows in the forward direction. Value of Z F,o varies with the frequency of output current [24], and will usually be non-zero. It will thus interact with input impedance Z F, in of the FR three-phase inverter, which behaves like a load [25].…”

Section: Overview Of Impedances and Their Interactionsmentioning

confidence: 99%

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Impedance interactions in bidirectional cascaded converter

Tian¹,

Loh²,

Chen³

et al. 2016

IET Power Electronics

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A cascaded converter is built by connecting one elementary converter to another. Output impedance of one converter will therefore interact with input impedance of the other converter. This interaction will change when power flow reverses. To compare this difference, an investigation is performed here for showing that forward and reverse interactions are prominently different in terms of dynamics and stability, even though the cascaded converter control remains unchanged. The concluded findings have been verified by simulation and experimental results, from which, important guidelines have been formulated for the cascaded converter when used in either unidirectional or bidirectional applications.

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Section: Overview Of Impedances and Their Interactionsmentioning

confidence: 99%

“…Forward and reverse impedances of the inverter are significantly different under power control. As discussed in [22–24, 39, 40], the negative impedance will introduce instability factor to the system, so it is appropriate for studying impedance interactions documented in the following section.…”

Section: Derivation Of Impedancesmentioning

confidence: 99%

Impedance interactions in bidirectional cascaded converter

Tian¹,

Loh²,

Chen³

et al. 2016

IET Power Electronics

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“…Finally, it can be observed that the numerator of the input control-to-input current (27) presents no terms regarding the output duty cycle. The same can be noted from the numerator of the output control-to-output current (31) which disregards the effects of the input duty ratio, being a consequence of the averaged model previously expressed.…”

Section: Control Transfer Functionsmentioning

confidence: 98%

Steady-State Analysis of the Modular Multilevel Converter

Spier¹,

Mestre²,

Prieto‐Araujo

et al. 2019

IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society

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This paper focuses on the modeling, dynamic analysis, and simulation of the bidirectional DC-DC boost-buck power converter. The switching sequence applies different duty cycles in the input and output stages, resulting in full regulation of the system variables. By using this strategy, the input stage can be regulated disregarding perturbations in the output leg, as well as the output stage can be controlled independently of the effects of disturbances in the input part; which gives significant robustness to the converter. Based on the switching actions, the state-space average equations are derived, accomplishing the base to obtain the small-signal equations and equivalent small-signal circuits. The open-loop transfer functions are developed, besides the input and output impedance, and the audio susceptibility. Simulation results indicate that the proposed model can predict the dynamic behavior of the system in a wide range of the frequency spectrum, and the results in the time domain are in perfect agreement with the model predictions under disturbances of the control variables, variations of the value of the supply voltage and load changes.

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“…Oscillations can be damped by inserting a virtual impedance at the output of voltage-regulating converters to offset the negative resistance of CPLs [11]. In [12][13][14], a converter introduces a virtual resistor by feeding the output current back to the voltage control loop, which simulates the passive damping control method. A virtual capacitance control system is introduced [15][16][17].…”

Section: Introductionmentioning

confidence: 99%