Call For Paper Volume:4 Issue:10 Oct'2017 |

ISLANDING DETECTION USING DEMODULATION BASED FFT

Publication Date : 14/04/2016



Author(s) :

Kumaravel.K , Vetrivelan. P.L.


Volume/Issue :
Volume 3
,
Issue 4
(04 - 2016)



Abstract :

When the load mismatch occurs, it clearly reveals that there exists an impedance mismatch in power distribution systems. This is a serious problem in power delivery. Hence in this method based on multiple frequency harmonic current injection is injecting two non-characteristic symmetric harmonic currents, and then according to the different harmonic voltages caused by different frequency harmonic currents, all three-phase impedances can be calculated accurately. This project proposes a novel method of Demodulation based FFT for three-phase grid impedance detection method based on dual-frequency harmonic current injection for islanding detection. This method differs from the conventional transform by the way of changing spectrum detection method. The estimation of harmonic content and based on the amount of harmonics islanding is decided. Using fourier transforms always results in perfect harmonic estimation and hence the islanding also can be detected with our proposed method. Grid impedance detection based on single harmonic current injection is reliable in three-phase impedance balanced grid. Simulation and experiments are carried out under grid impedance balanced and unbalanced conditions.


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ISLANDING DETECTION USING DEMODULATION BASED FFT

April 9, 2016