Unintentional Islanding RLC Tank Test Method Comparison
报告
Global safety science and certification organization UL Solutions conducted an independent evaluation comparing traditional IEEE 1547.1-2020 unintentional-islanding testing with an automated power hardware-in-the-loop (PHIL) approach using the same photovoltaic inverter under identical test conditions.
Five representative IEEE 1547.1-2020 Category B test cases were executed to assess anti-islanding performance and result comparability between the two methodologies. The study found that the automated PHIL-based approach produced results comparable to the traditional manually tuned RLC load-bank method while satisfying applicable IEEE 1547 clearing-time requirements in the selected cases.
In addition, the automated methodology significantly reduced manual tuning, measurement, and documentation activities, enabling project test execution in less than one day compared with one to two weeks for a traditional test program. While not explicitly validated in the testing, UL Solutions noted that the automated PHIL-based approach may also provide more precise and repeatable tuning of test conditions than manual methods using physical components.