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Abstract
This paper investigates active damping of LCL-filter resonance in a grid-connected voltage-source converter with only grid-current feedback control. Basic analysis in the s-domain shows that the proposed damping technique with a negative high-pass filter along its damping path is equivalent to adding a virtual impedance across the grid-side inductance. This added impedance is more precisely represented by a series RL branch in parallel with a negative inductance. The negative inductance helps to mitigate
phase lag caused by time delays found in a digitally controlled system. The mitigation of phase-lag, in turn, helps to shrink the region of nonminimum-phase behavior caused by negative virtual resistance inserted unintentionally by most digitally implemented active damping techniques. The presented high-pass-filtered active damping technique with a single grid-current feedback loop is thus a more effective technique, whose systematic design in the z-domain has been developed in this paper. For verification, experimental
testing has been performed with results obtained matching the theoretical expectations closely.
phase lag caused by time delays found in a digitally controlled system. The mitigation of phase-lag, in turn, helps to shrink the region of nonminimum-phase behavior caused by negative virtual resistance inserted unintentionally by most digitally implemented active damping techniques. The presented high-pass-filtered active damping technique with a single grid-current feedback loop is thus a more effective technique, whose systematic design in the z-domain has been developed in this paper. For verification, experimental
testing has been performed with results obtained matching the theoretical expectations closely.
Original language | English |
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Journal | I E E E Transactions on Power Electronics |
Volume | 31 |
Issue number | 1 |
Pages (from-to) | 213-223 |
Number of pages | 11 |
ISSN | 0885-8993 |
DOIs | |
Publication status | Published - Jan 2016 |
Keywords
- LCL filter
- Nonminimum phase system
- Resonance damping
- Virtual impedance
- Voltage-source converter
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Dive into the research topics of 'Grid-Current-Feedback Active Damping for LCL Resonance in Grid-Connected Voltage-Source Converters'. Together they form a unique fingerprint.Projects
- 1 Finished
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HARMONY: HARMONY - Harmonic identification, mitigation and control in power electronics based power systems
Blaabjerg, F., Bak, C. L., Wang, X., Beres, R. N., Kwon, J., Gui, Y., Yoon, C. & Ebrahimzadeh, E.
01/02/2013 → 28/02/2018
Project: Research