Development of Anti-Islanding Hybrid Detection Technique in Grid-Connected Distributed Generation

Abstract

This thesis is development of anti-islanding hybrid detection technique in grid-connected distributed generation. The approach in research and development are as follows. All islanding detection techniques and relevant content are compiled & summarized. The weaknesses of over/under-voltage islanding detection technique by Powerworld Simulator Program is suggested. The phenomenon of voltage at point of common coupling, after the islanding condition happened is demonstrated on experiments with inverter 1 phase 1 kW. The new hybrid technique that is an over/under-voltage and under voltage shift technique is proposed. The new hybrid technique has demonstrated on Matlab/Simulink. The simulation results lead to conclusions that the over/under-voltage and under voltage shift of hybrid islanding detection method is very effective because it can determine anti-islanding condition very fast. ∆P/P > 38.41% could determine anti-islanding condition within 0.04 s; ∆P/P < -24.39% could determine anti-islanding condition within 0.04 s; -24.39% ≤ ∆P/P ≤ 38.41% could determine anti-islanding condition within 0.08 s. This method perturbed the system, only in the case of -24.39% ≤ ∆P/P ≤ 38.41% which the control system of inverter injected a signal of under voltage shift as necessary to check if the occurrence condition was an islanding condition.