Islanding detection and load shedding scheme for radial distribution systems integrated with dispersed generations


This study presents a unique islanding detection and optimal load shedding scheme for radial distribution systems integrated with dispersed generation (DG). A straightforward and effective passive islanding detection method is developed based on the phase-area technique and employing a probabilistic neural network-based classifier. Once the system detects unintentional islanding state, it utilises an optimal load shedding scheme to prevent system collapse thanks to load-generation mismatch and voltage instability encountered in the islanded part of the system. The optimal load shedding theme is developed primarily based on the backtracking search algorithm. Extensive tests conducted with the DigSilent Power Factory® software and MATLAB® software on the IEEE 33-bus system with four DG units considering many eventualities of islanding condition were utilised to evaluate the effectiveness of the proposed islanding detection methodology and also the optimal load shedding scheme. The results showed that the proposed method can effectively detect the islanding events and stabilise the islanded part of the system with minimum load curtailment.

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