Wavelet-Based Islanding Detection in Grid-Connected PV Systems
Pigazo, A.
Liserre, M.
Mastromauro, R.A.
Moreno, V.M.
Dell'Aquila, A.
Dept. of Electron. & Comput., Univ. of Cantabria, Santander, Spain;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Nov. 2009
Volume: 56,
Issue: 11
On page(s): 4445-4455
ISSN: 0278-0046
INSPEC Accession Number: 10916324
Digital Object Identifier: 10.1109/TIE.2008.928097
First Published: 2008-07-09
Current Version Published: 2009-10-09
Abstract
Distributed power generation systems (DPGSs) based on inverters require reliable islanding detection algorithms (passive or active) in order to determine the electrical grid status and operate the grid-connected inverter properly. These methods are based on the analysis of the DPGS voltage, current, and power in time or frequency domain. This paper proposes a time-frequency detection algorithm based on monitoring the DPGS output power considering the influence of the pulsewidth modulation, the output LCL filter, and the employed current controller. Wavelet analysis is applied to obtain time localization of the islanding condition. Simulation and experimental results show the performance of the proposed detection algorithm in comparison with existing methods.
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