DocumentCode :
581176
Title :
On the stability of discrete-time active damping methods for VSI converters with a LCL input filter
Author :
Orellana, Marcos ; Griñó, Robert
fYear :
2012
fDate :
25-28 Oct. 2012
Firstpage :
2378
Lastpage :
2383
Abstract :
The use of LCL filters with VSI converters is interesting since they present good attenuation of current ripple at high frequencies. Nevertheless, they also present a high resonance peak which can cause undesired oscillations, and even instability problems. Passive and Active Damping are methods which try to reduce those resonance effects. In this paper, Passive Damping is briefly reviewed and Active Damping is formally analyzed in continuous-time and, specially, in discrete-time. It will be shown that the one period delay included in sampled-data control systems and the grid impedance play a very important role in stability conditions. The presented results are useful to design discrete-time Active Damping controllers. Moreover, important implications for higher level controls can be deduced since the Active Damping is the first control loop in the power converter´s controller.
Keywords :
discrete time filters; power convertors; power filters; power grids; resonant invertors; stability; LCL input filter; VSI converters; continuous-time; current ripple attenuation; discrete-time active damping controllers; grid impedance; one period delay; passive damping; power converter controller; resonance effects; sampled-data control systems; stability; voltage source inverter; Control systems; Damping; Hafnium compounds; Mathematical model; Power system stability; Stability analysis; Transfer functions;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society
Conference_Location :
Montreal, QC
ISSN :
1553-572X
Print_ISBN :
978-1-4673-2419-9
Electronic_ISBN :
1553-572X
Type :
conf
DOI :
10.1109/IECON.2012.6388871
Filename :
6388871
Link To Document :
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