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그리드포밍 컨버터의 전력 디커플링 제어 방법: 검토

Power Decoupling Control Method of Grid-Forming Converter: Review

최영준|이형석
한국컴퓨터정보학회 (The Korean Society Of Computer And Information)|2023.12|한국컴퓨터정보학회논문지 (Journal of The Korea Society of Computer and Information)|제28권 제12호|pp. 221-229|DOI https://doi.org/10.9708/jksci.2023.28.12.221

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키워드

Power sharing그리드포밍전력 디커플링저전압 마이크로그리드전력 공유분산 발전원Grid-formingPower decouplingLow-voltage microgridDistributed generators
주제분류컴퓨터학

초록

최근 전력 계통에 인공 관성, 감쇠, 블랙스타트 기능, 독립 운전 기능 등을 제공할 수 있어 많은 주목을 받고 있는 Grid-forming(GFM) 컨버터는 저전압 Microgrids(MG)에서 낮은 라인 임피던스의 X/R 비율과 작지 않은 전력각으로 인한 유효전력과 무효전력 간의 커플링 현상이 발생한다. 이러한 전력 커플링 현상은 GFM 컨버터의 안정성 및 성능 저하 문제, 부정확한 전력 공유 문제, 제어 파라미터 설계 문제를 유발하고 있다. 따라서 본 논문은 GFM 컨버터와 관련된 제어 방법뿐만 아니라 전력 디커플링 방법에 대한 검토 연구로서, 유망 제어 방법을 소개하고 전력 디커플링방법에 대한 비판적 검토를 통하여 향후 연구 활동의 접근성을 높이고자 하였다. 이에 따라 전력디커플링 방법 연구를 위해 향후 연구자들이 쉽게 접근할 수 있어 분산 발전원 확대에 기여할 수있을 것이다.

Abstract

Recently, Grid-forming(GFM) converter, which offers features such as virtual inertia, damping, black start capability, and islanded mode operation in power systems, has gained significant attention. However, in low-voltage microgrids(MG), it faces challenges due to the coupling phenomenon between active and reactive power caused by the low line impedance X/R ratio and a non-negligible power angle. This power coupling issue leads to stability and performance degradation, inaccurate power sharing, and control parameter design problems for GFM converters. Therefore, this paper serves as a review study on not only control methods associated with GFM converters but also power decoupling techniques. The aim is to introduce promising control methods and enhance accessibility to future research activities by providing a critical review of power decoupling methods. Consequently, by facilitating easy access for future researchers to the study of power decoupling methods, this work is expected to contribute to the expansion of distributed power generation.

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