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Abstract
This paper addresses the harmonic stability resulting from the current-control interactions of the multi-paralleled, LCLfiltered voltage-source converters. First, an alternative impedance model is proposed for the single-loop current control. The control output admittance of the converter is decomposed into a passive filter output admittance in series with an active admittance which is dependent on the current controller and the time delay. The frequency-domain passivity theory is then applied to the active admittance for system stability analysis. It reveals that the stability region of the single-loop grid current control is not only dependent on the time delay, but affected also by the resonance frequency of the converter-side filter inductor and filter capacitor. Further on, the damping injection based on the discrete derivative controller is proposed to enhance the passivity of individual converters and thereby stabilizing the paralleled converters. Lastly, simulation studies and laboratory tests validate the effectiveness of theoretical analysis and controller design.
Original language | English |
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Journal | I E E E Transactions on Power Electronics |
Volume | 32 |
Issue number | 11 |
Pages (from-to) | 8922 - 8935 |
Number of pages | 14 |
ISSN | 0885-8993 |
DOIs | |
Publication status | Published - Nov 2017 |
Keywords
- Stability
- Current Control
- Passivity
- Damping
- Admittance
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Dive into the research topics of 'Passivity-Based Stability Analysis and Damping Injection for Multiparalleled VSCs with LCL Filters'. 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