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Effect of single-current-feedback active damping on the output impedance of grid-connected inverter
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| Author(s) |
Aapo AAPRO |
| Abstract |
LCL-_lter is commonly used as an output-side _lter in a grid-connected converter due to its good attenuation capability at the switching harmonic frequencies. LCL-_lter creates several resonances in theconverter dynamics which shall be damped for ensuring robust performance of the converter. The resonant behavior introduced by the LCL-_lter can be attenuated with active damping (AD) instead of passive damping to improve the conversion ef_ciency. The active damping affects the output impedance of theconverter, and the impedance should be accurately predicted in order to allow analyzing impedance-based stability of power electronics-based power systems. This paper presents the small-signal modelfor inverter-current feedback (ICF) converter using only the inverter-side inductor current feedback forboth control and active damping. Additionally, the output impedance properties are comprehensivelyanalyzed. Experimental measurements from 3-kW prototype are presented to verify the analysis. |
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| Filename: | 0164-epe2016-full-11231844.pdf |
| Filesize: | 704.6 KB |
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| Type |
Members Only |
| Date |
Last modified 2017-04-13 by System |
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