Anti-Islanding Techniques for Distributed Power Generators. AIF FORUM Jun Yin. Outline . Introduction Review of Anti-Islanding Techniques Islanding Frequency Model & Hidden Gene Principle Proportional Power Spectral Density (PPSD) for Islanding Detection
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Distributed Generation Systems
Energy Value Information
& Control Links
Central Generating Station
Unintentional islanding is a situation in which local DG systems continue to supply power to the local loads at a sustained voltage and frequency while the main EPS is de-energized unknowingly.
Fig. 1 Interconnection of DG systems with the power system
α < 0
α > 0
Fig. 2 The phase characteristics of the islanding load
The relationship between the current period and the voltage period in islanding operation
Fig. 3 Islanding frequency model
Fig. 4 System model for response to disturbance and noise
Fig. 5 Bode plot of system transfer function
The signal energy is given by
The proportional Power Spectral Density
Fig. 7 Period variation in grid-connected operation.
Fig. 8 PPSD of voltage periods
in grid-connected operation
Fig. 9 Period variation in islanding operation
Fig. 10 PPSD of voltage periods in islanding operation
Fig. 11 A lab testing system for single phase islanding operation
Fig. 12 Proportional energy in frequency band from radian
Fig. 14 Covariance in islanding operation
Fig. 16 Covariance changes during islanding operation
Adaptive Logic Phase Shift (ALPS) or Adaptive Reactive Power Shift (ARPS) Algorithm
Fig. 17 SMS phase shift
The probability of
Is greater than 0.6
Fig. 18 Lab testing system for hybrid anti-islanding algorithm
(2) Probability of Cause and Effect after islanding operation
(3) Additional D-axis current after islanding operation
(4) Total D-axis current after islanding operation
Fig. 19 Lab tests for hybrid anti-islanding algorithm
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