Analysis of the NDZ formulation theory of active frequency shift islanding detection method for grid-connected PV system

Abstract

Active frequency drift islanding detection method is the most widely used in the distributed generator islanding detection. Now the domestic researches of islanding detection in China are base on algorithm Improvement but without very effective, because the fundamental reasons about the NDZ have not been researched and explained deeply. Therefore, the paper analyses the performances of the frequency drift islanding method from different aspects and deeply explains the reasons conducting the NDZ of the islanding detection from the aspects of load frequency characteristic and SFS method phasefrequency characteristic, which are the major factors affecting the phase-frequency characteristic of the islanding system.

On active anti-islanding techniques: survey

“…However, this technique can easily be implemented using a microprocessor. It affects the power quality [42]- [53]. In this Technique, SMS is based on a positive feedback destabilization for the output of the inverter in order to detect islanding state which changes relative to the grid voltage.…”

Comparative Study of Passive and Active Islanding Detection Methods for PV Grid-Connected Systems

“…This method can easily be implemented with the help of a microprocessor-based controller. However, this method degrades the power quality because of the disturbance signals, which causes a variation in the frequency or magnitude of the output current [26][27][28][29][30][31][32][33][34][35][36][37][38][39]. …”