An Integrated Passive Islanding Detection Method for Distributed Generators
نویسندگان
چکیده
This study proposes a new islanding detection method for use of grid-interconnected distributed generators (DG). The method is based on two indices: the rate of change of frequency (ROCOF) and the rate of change of voltage (ROCOV). When a DG is grid-interconnected, the ROCOF and ROCOV are lower than the threshold value. In contrast, as an islanding occurs, the ROCOF or ROCOV become much higher than the threshold values. Detection systems monitor terminal voltage at the grid-interconnected point to calculate ROCOF and ROCOV, and issue an operating signal when the value and duration of ROCOF or ROCOV exceed a given threshold. In this study, experiments are conducted to illustrate the principles of the proposed technique for both synchronous generators and induction generators. The test results show that the newly proposed method is reliable, economical, and easy to implement for islanding detection of distributed generators. Key-Words: Islanding detection, Distributed generator, Rate of change of frequency, Rate of change of voltage
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