| Title |
A Study on the Estimation of the Resonance Frequency for an Active Damping Technique of Grid Connected Converters |
| Authors |
Il-Woo Park ; Woo-Cheol Lee |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2013.27.1.076 |
| Keywords |
Grid Connected ; Active Damping ; Resonance Frequency |
| Abstract |
The renewable energy sources is raising for use of grid connected systems, for which higher power quality requirements are being issued. A grid connected converter requires a LC-filter stage, this one is lightly damped for efficiency constraints. Hence, it is subject to resonance if excited by the converter current harmonics or pre-exciting grid voltage harmonics. In this paper, an active damping technique employing notch filter for damping of the resonance frequency is introduced. This technique doesn"t need to additional sensors. In addition, it is simple to apply for various systems. Monitoring of the resonance frequency ensures the stable operation of the proper connection and disconnection of the grid. This paper proposes the estimating method of a resonant frequency to determine the cut-off frequency of the notch filter. This method is validated by both simulation and experimental results. |