روشي ساده براي شناسيايي پديده جزيره با منطقه غير قابل تشخيص كوچك

كارشناسي ارشد

emergence of Distributed Generation (DG) systems, have brought a wide range of advantages. Green-house gas reduction, pick shaving, power quality enhancements, and power system reliability improvement are some examples of these benefits. However, this technology is facing some challenges. The most important one is the islanding phenomenon. Anti-islanding protection remains the highest challenge distributed generation should overcome. Articles have introduced a number of islanding detection methods which have some advantages, and disadvantages like every protection algorithm. In this dissertation we introduced an adaptive detection method, which reduce the other method disadvantages, like a big non-detection zone, or power quality degradation. This method is applicable to inverter based islanding detection methods. With a slight variation in output power function of inverter, a positive feedback emerges. In normal behavior of DG, the method remains stand-by. With a slight clue of islanding the method becomes activate and destabilize terminal voltage out of the acceptable region of voltage relays. This method has a negligible non-detection zone, for any kind of inverter control system. It is also secure, and the security doesn’t depend on the grid, load, or inverter factors. Keywords: Distributed Generation, Anti-islanding Protection, Inverter Based Distributed Generations, Non-detection zone, Security, Dependability

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