Islanding detection and anti-islanding protection is an important concern in grid connected solar photovoltaic (PV) system due to utility service personnel and equipment safety. The aim of this paper is to analyse, design, implement and evaluate an active anti-islanding method in solar photovoltaic power plants. Active methods introduce a deliberate disturbance into the system, and monitor the disturbance effect for islanding detection. An active islanding detection method using voltage harmonic injection into the reference modulating signal is proposed in this study. The proposed method is based on injecting small voltage harmonics into the PWM modulator in order to detect the islanding event. The performance of the proposed method has been studied using simulations in POWERSIM platform and the results are presented to highlight the effectiveness of the method.
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