Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/8902
Title: Rapid islanding detection using multi-level inverter for grid-interactive PV system
Authors: Tsang, KM 
Chan, WL 
Keywords: Islanding detection
Photovoltaic system
Reference signal generator
Issue Date: 2014
Publisher: Pergamon Press
Source: Energy conversion and management, 2014, v. 77, p. 278-286 How to cite?
Journal: Energy conversion and management 
Abstract: A novel reference signal generator is combined with a multi-level inverter to form a rapid islanding detection scheme for grid-interactive PV system. The reference signal generator can easily be synchronized with the utility grid signal and produced a fixed magnitude and very low total harmonic distortion (THD) sinusoidal signal which is in phase with the utility grid signal. Unlike conventional phase-locked loop (PLL) circuitry, the reference signal generator can also provide a fixed magnitude sinusoidal signal even if the utility grid is disconnected and automatically re-synchronous with the grid rapidly. Consequently, seamless transfer between grid-connected and stand-alone modes could easily be achieved if anti-islanding protection is not required. If a saturation element is applied to the raw reference signal followed by the synthesis of the truncated signal using a multi-level inverter, the distinct flat-top feature of the synthesized signal can quickly and easily be identified if the network is in islanding mode at the point of common coupling. Experimental results are included to demonstrate the effectiveness of the proposed detection scheme.
URI: http://hdl.handle.net/10397/8902
ISSN: 0196-8904
EISSN: 1879-2227
DOI: 10.1016/j.enconman.2013.09.039
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