정궤환을 이용한 무효전력 변동기반의 단독운전 방지 성능 검증 = Performance Verification of Anti-Islanding of Reactive Power Variation Method using Positive Feedback

다국어 초록 (Multilingual Abstract)

This study proposed a reactive power variation (RPV) method equipped with positive feedback (PF) for detecting the islanding operation of distributed generation systems. The proposed RPV consists of the constant reactive power component and a certain reactive power term and uses the frequency deviation between the rated and the measured frequencies. The constant reactive power is injected from distributed generation system and power factor is to 0.9975 in grid-connected operation. PF is activated from generation of the frequency deviation and the injected reactive power is continuously increased due to PF when islanding occurs. Consequently, the increasing reactive power causes the point of common coupling frequency to deviate from the maximum/minimum threshold level. Performance of the proposed RPV is verified in a 1.7 kW T-type inverter, and the detection times are 53 and 150 ms.

참고문헌 (Reference)

1 강성욱, "향상된 고조파 검출 능력을 갖는 계통연계 인버터의 하이브리드 단독운전 방지기법" 전력전자학회 19 (19): 312-319, 2014

2 김병헌, "역상분 전압 주입을 이용한 태양광 인버터의 단독 운전 검출" 전력전자학회 17 (17): 546-552, 2012

3 조영민, "불검출영역이 없는 새로운 단독운전 검출기법" 전력전자학회 20 (20): 540-549, 2015

4 "Test Procedure of Islanding Prevention Measures for Utility-Interconnected Photovoltaic Inverters, KS C IEC 62116"

5 "IEEE Standard for Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces, IEEE standard 1547-2018(Revision of IEEE standard 1547-2003)"

6 Z. Ye, "Evaluation of anti-islanding schemes based on nondetection zone concept" 19 (19): 1171-1176, 2004

7 J. Zhang, "An improved islanding detection method for a grid-connected inverter with intermittent bilateral reactive power variation" 28 (28): 268-278, 2013

8 Y. Zhu, "A novel RPV (Reactive-Power- Variation) anti-islanding method based on adapted reactive power perturbation" 28 (28): 4998-2012, 2013