Islanding detection is one of the most important issues for the distributed generation (DG) systems connected to an electric power grid. The conventional passive islanding detection methods inherently have a nondetection zone (NDZ), and active islanding detection methods might cause problems with safety, reliability, stability, and power quality on a power system. This paper proposes a passive islanding detection method with the zero NDZ property by considering the switching frequency from an inverter of the DG system. Moreover, the proposed method does not cause any negative effects in the aforementioned problems because it avoids applying the intended changes such as variations of reactive power and/or harmonics, which are required in the active islanding detection methods. Several case studies are carried out to verify that the proposed method can detect the islanding operation within 20 ms, which is less than 150 ms required in a recloser as the shortest mechanical reclosing (delay) time. Moreover, this value satisfies the requirement of 2 s given in IEEE Std. 1547.
Bibliographical noteFunding Information:
Manuscript received May 14, 2009; revised May 14, 2009 and November 3, 2009; accepted November 23, 2009. Date of publication May 10, 2010; date of current version September 17, 2010. Paper 2009-PSEC-114.R2, presented at the 2009 Industry Applications Society Annual Meeting, Houston, TX, October 4–8, and approved for publication in the IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS by the Power Systems Engineering Committee of the IEEE Industry Applications Society. This work was supported by the Human Resources Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Knowledge Economy (Grant 2007-P-EP-HM-E-08-0000).
All Science Journal Classification (ASJC) codes
- Control and Systems Engineering
- Industrial and Manufacturing Engineering
- Electrical and Electronic Engineering