Analysis of Anti-Islanding Schemes using Frequency Drift in Distributed Generation System

Abstract

Unintentional islanding results in safety hazards, power quality degradation, and many other issues. Thus, islanding detection of grid-connected distributed generation system is a key function for standards compliance. Many anti-islanding schemes are currently being studied; however, existing anti-islanding schemes used in inverters have power quality degradation and non-detection zone issues. Therefore, this paper analyzes existing anti-islanding schemes by using frequency drift in accordance with both islanding detection performance and power quality. This paper also proposes a new anti-islanding scheme by using frequency drift. Both simulation and experimental results show that the proposed scheme has negligible power quality degradation and no non-detection zones compared with other existing schemes.

A modified active frequency islanding detection method based on load frequency and chopping fraction changes

“…The authors in refs. [4,5] presented a method to detect islanding by monitoring a change in harmonic components of voltage. Although islanding can be identified instantly by using such a manual technique, the problem of NDZ persists.…”