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

Ni, Zhaohui; Cheng, Yujie; Xu, Jianhua; Cheng, Haifeng; Zhou, Jianjun; Bai, Song

doi:10.1109/ceepe51765.2021.9475704

Cited by 2 publications

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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. In Guo et al (2019) and Lin and Ruan (2019), instead of installing an extra converter at the PCC, the active damper is achieved by adding a damping branch on the control algorithm of the existing grid-connected inverter, requiring an upgrade in the control program's existing inverters.…”

Section: Introductionmentioning

confidence: 99%

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

Chen

Zhao

2022

Front. Energy Res.

View full text Add to dashboard Cite

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.

show abstract