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A New Anti-Islanding Method for Utility Interconnection of Distributed Power Generation System  

Hwang In-Ho (충북과학대학 전기에너지시스템과)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.9, no.6, 2004 , pp. 568-576 More about this Journal
Abstract
This paper presents a new anti-islanding method for distributed power generation system (DPGS) using renewable energy. Based on the concept of real and reactive power mismatch, three different islanding conditions are analyzed. It is shown via analysis that islanding voltage is a function of real power alone, where as its frequency is a function of both real and reactive power. Using this analysis, a new anti-islanding method is developed. The proposed protection algorithm continuously perturbs ($\pm$5%) the reactive power supplied by DPGS while simultaneously monitoring the utility voltage and frequency. If a measurable frequency deviation took place by islanding, the real power of DPGS is further reduced to 80%. This detection method is shown to be fast acting under resonant loads. Possible islanding conditions are simulated and verified with analysis. Experimental results on a 0.5kW utility-interactive fuel cell system are suggested.
Keywords
Anti-islanding; Distributed power generation system; Utility interconnection;
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