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Impedance-Based Analysis of Active Frequency Drift Islanding Detection for Grid-Tied Inverter System.
- Source :
-
IEEE Transactions on Industry Applications . Jan2016, Vol. 52 Issue 1, p332-341. 10p. - Publication Year :
- 2016
-
Abstract
- Islanding detection is critical to the safety of grid-tied inverters. This paper presents an impedance-based analysis of the active frequency drift (AFD) islanding detection method. To study this method, the output impedance of a grid-tied inverter is modeled. The Zqq of the inverter impedance features a negative incremental resistor, whose magnitude is equal to the dc impedance magnitude of the local load defined by the test standard. With a large value of feedforward gain $N$ in the AFD method, the phase of Zqq is shown to drop below 180°. Under an islanding condition, due to a lack of phase margin, the inverter system becomes unstable with a frequency drift away from its steady state. The islanding condition is then identified by a frequency detection unit. Experimental results verify the analysis. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00939994
- Volume :
- 52
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Industry Applications
- Publication Type :
- Academic Journal
- Accession number :
- 112441571
- Full Text :
- https://doi.org/10.1109/TIA.2015.2480847