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AuthorMorsy, A. S.
AuthorAhmed, S.
AuthorEnjeti, P.
AuthorMassoud, Ahmed
Available date2022-03-23T07:01:12Z
Publication Date2010
Publication NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
ResourceScopus
Identifierhttp://dx.doi.org/10.1109/APEC.2010.5433694
IdentifierIEEE
URIhttp://hdl.handle.net/10576/28885
AbstractA grid connected CSI requires a CL filter stage. In this work, the isolation transformer leakage inductance constitutes this filter inductance. This CL filter is lightly damped for efficiency constraints. Hence, it is subject to resonance if excited by inverter current harmonics, pre-existing grid voltage harmonics, or due to step changes in power. Previous work on active damping employed a virtual resistance at high frequencies, including the resonance frequency. However, this method shows limited gain and phase stability margins. In this paper an active damping technique employing a virtual negative inductance for the CSI is proposed. The introduction of a virtual negative inductance around the resonance frequency causes active frequency shifting. The advantages of the proposed system are better time response and increased stability margins. Simulation results for a grid connected CSI have been presented to substantiate the proposed technique.
Languageen
SubjectActive damping
Current source inverter
Frequency-shifting
Grid voltage
Grid-connected
High frequency
Inverter current
Isolation transformers
Leakage inductance
Resonance frequencies
Simulation result
Stability margins
Step changes
Time response
Virtual resistance
Damping
Natural frequencies
Phase stability
Power electronics
System stability
Inductance
TitleAn active damping technique for a current source inverter employing a virtual negative inductance
TypeConference Paper
Pagination63-67
dc.accessType Abstract Only


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