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The stability of a grid-tied, power conditioning system (PCS)—equipped with frequency drift anti-islanding—is analyzed in this paper. To reduce the nondetection zone (NDZ), the positive feedback gain (PFG) of the frequency drift method should be increased. However, it was reported that PFG is restricted due to stability issues of the system under a weak grid. Careful analysis revealed that such a...
In this paper, the methodology to analyze Non-Detection Zone (NDZ) of islanding detection algorithm for multiple Power Conditioning Systems (PCSs) connected to grid is proposed. The PCSs with renewable energy source or battery energy storage system are equipped with anti-islanding functionality and the method using frequency positive-feedback is one of the most popular methods to detect islanding...
In this paper, the Non Detection Zones (NDZs) of frequency drift anti-islanding were compared according to the structure of positive feedback loop for closed-loop power controlled Distributed Generators (DGs). It was reported that the NDZ of frequency drift anti-islanding is enlarged with closed-loop based constant power controller. On the other hand, some research gives the functionality of the frequency...
In this paper, a method to detect islanding operation of distributed generator (DG) is proposed, which exploits frequency drift accelerated by grid unbalance component, namely negative sequence component of grid voltage. The negative sequence component could be added to the gain of frequency feedback loop in the conventional anti-islanding scheme. To keep the power factor regulation, the displacement...
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