期刊
ELECTRIC POWER SYSTEMS RESEARCH
卷 177, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.epsr.2019.105983
关键词
Microgrids; islanding detection; variational mode decomposition; Shannon entropy; distributed energy resources
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2018R1A2A1A05078680]
- National Research Foundation of Korea [2018R1A2A1A05078680] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The high penetration of renewable energy resources, along with their inherently intermittent nature, makes unintentional islanding a critical issue in distributed generation systems. This study proposes an islanding detection scheme for integrated microgrids by using variational mode decomposition-based mode singular entropy (VMDMSE). The proposed scheme retrieves a three-phase voltage signal at the targeted distribution energy resource (DER), and employs variational mode decomposition (VMD) to obtain the principal modes. First, singular value decomposition (SVD) generates the characteristic singular matrix. Then, the probability array associated with the singular values is calculated. Finally, the mode singular entropy (MSE) is computed and utilized as an islanding detection index. The proposed scheme is evaluated through several simulations in various islanded and normal operating conditions. Moreover, cases involve varying power mismatches, and the quality factor are simulated on a widely used UL-1741 standard test system in MATLAB/SIMULINK environment. The obtained results confirm that the proposed scheme is capable of detecting islanding operation within half a cycle, even for a zero mismatch power between load and generation in the islanded region.
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