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Abstract
This paper investigates the active damping of LCL-filter resonance within single-loop grid current control of grid-connected voltage source converters. First, the basic analysis in the continuous s-domain reveals that the grid-current-feedback active damping forms a virtual impedance across the grid-side inductor, and the use of a high-pass filter with a negative sign shapes the virtual impedance by an RL damper paralleled by a negative inductance. It is further found that such a negative virtual inductance plays a critical role in mitigating the phase lag caused by the time delay in a digital control system. The instability induced by the negative virtual resistance, which is commonly experienced in the feedback-type active damping, can thus be avoided. A systematic design method of the highpass filter is also proposed by the help of root locus analysis in the discrete z-domain. Lastly, experimental tests are presented to validate the theoretical analysis.
Originalsprog | Engelsk |
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Titel | Proceedings of the 2014 IEEE Energy Conversion Congress and Exposition (ECCE) |
Antal sider | 8 |
Forlag | IEEE Press |
Publikationsdato | sep. 2014 |
Sider | 373-380 |
ISBN (Trykt) | 978-1-4799-5776-7 |
DOI | |
Status | Udgivet - sep. 2014 |
Begivenhed | 2014 IEEE Energy Conversion Congress and Exposition (ECCE) - Pittsburgh, Pittsburgh, USA Varighed: 14 sep. 2014 → 18 sep. 2014 |
Konference
Konference | 2014 IEEE Energy Conversion Congress and Exposition (ECCE) |
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Lokation | Pittsburgh |
Land/Område | USA |
By | Pittsburgh |
Periode | 14/09/2014 → 18/09/2014 |
Fingeraftryk
Dyk ned i forskningsemnerne om 'Analysis and design of grid-current-feedback active damping for LCL resonance in grid-connected voltage source converters'. Sammen danner de et unikt fingeraftryk.Projekter
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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
Projekter: Projekt › Forskning