A series active damper with closed-loop control for stabilizing single-phase power-electronics-based power system

Lu, Dapeng; Wang, Xiongfei; Bai, Haofeng; Blaabjerg, Frede

doi:10.1109/ecce.2016.7854774

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…Then the obtained parameters can be used to calculate the damping ratio at the resonance frequency and quantitatively describe the damping of the REPS. For series resonance, its damping ratio can be calculated according to formula (15), and for parallel resonance, it can be calculated according to formula (16).…”

Section: Equivalent Rlc Circuits Methods and Hdcementioning

confidence: 99%

“…A series of literatures have been devoted to designing reasonable virtual resistance. References [15,16] draw the Nyquist diagram of the system under different virtual resistance values, and selects the virtual resistance value that makes the system stability margin as large as possible according to the Nyquist stability criterion. However, it is necessary to establish a detailed impedance model of the system.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative damping reshaping method based on equivalent RLC circuits using an active damper

Feng

Wang

et al. 2022

IET Power Electronics

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Large scale power electronic converters in renewable energy power system (REPS) constitute a complex multi‐scale high‐order non‐linear network. Harmonic amplitude amplification of specific frequency (e.g. harmonic resonance) often occurs in stable REPS, threatening the normal operation of the system. The impedance reshaping methods based on the stability margin cannot quantitatively assess the risk of harmonic resonance, so that the reshaped system damping may be in a state of under‐ or over‐damped. This paper proposes a harmonic damping concise estimation (HDCE) method based on the one port equivalent RLC impedance model, which quantitatively describes the magnitude of harmonic damping of the system. Aiming at the harmonic damping of the system in an ideal power network, a method of quantitative reshaping of system damping based on HDCE using active damper is proposed, which ensures that the reshaped system is neither under‐damped nor over‐damped. The harmonic resonance is suppressed effectively while the current stress of the active damper is kept as small as possible. Simulation and experimental results verify the correctness of these analytical and quantitative damping reshaping methods.

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Section: Equivalent Rlc Circuits Methods and Hdcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantitative damping reshaping method based on equivalent RLC circuits using an active damper

Feng

Wang

et al. 2022

IET Power Electronics

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“…In Bai et al (2017), Wang et al (2015), and Bai et al (2016), active dampers are equipped with the series LC filter, reducing their power ratings significantly. In Zhao et al (2019) and Lu et al (2016), instead of paralleling at the PCC, the adaptive stabilizer is connected in series to reshape the grid impedance. In Ni et al (2021), a unified active damper combining a parallel and serial converter is proposed to reshape the equivalent impedance and enhance the stability of the GCI system.…”

Section: Introductionmentioning

confidence: 99%

Passivity Enhancement Strategy of Grid-Connected Inverter System Based on the Adaptive Active Damper

Chen

Zhao

2022

Front. Energy Res.

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The grid-connected inverter system may be unstable when connected to a weak grid, and installing an active damper as a virtual resistor at the PCC is convenient for stabilizing the system. This article proposes a passivity enhancement strategy for the grid-connected inverter system via the adaptive active damper. Furthermore, the admittances of the grid-connected inverter system with the active damper are derived, and the real parts of the admittances of the whole system have been calculated. And the admittance measurement results obtained by the frequency scanning method approximately match the theoretical results. Additionally, the virtual resistor’s stability region is discussed, the bandwidth of the phase-locked loop is recommended, ensuring the stabilizing effect of the active damper under the weak grid. And the online resonance frequency detection algorithm guarantees the passivity enhancement of the active damper when grid impedance changes. Finally, controller hardware-in-the-loop tests validate the theoretical analysis of passivity enhancement based on the active damper.

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An Adaptive Series Active Damper for Stabilizing Grid-Connected System Under Weak Grid

Cheng

et al. 2021

2021 4th International Conference on Energy, Electrical and Power Engineering (CEEPE)

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A series active damper with closed-loop control for stabilizing single-phase power-electronics-based power system

Cited by 6 publications

References 15 publications

Quantitative damping reshaping method based on equivalent RLC circuits using an active damper

Quantitative damping reshaping method based on equivalent RLC circuits using an active damper

Passivity Enhancement Strategy of Grid-Connected Inverter System Based on the Adaptive Active Damper

An Adaptive Series Active Damper for Stabilizing Grid-Connected System Under Weak Grid

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