This article proposes a graphical method to evaluate the feasibility of intentional islanding of distributed synchronous generators. The approach is based on the combination of the performance and restriction curves. These curves are based on the islanding detection capability of the frequency-based protection at the point of common coupling and on the generator protection at its terminals. When relating the islanding detection time, the restriction time and the active power imbalance, the intersection of such curves defines two operating zones: i) the favorable island formation zone, in which the operation of the energized island is stable, and ii) the non-favorable island formation zone, in which the islanding is infeasible. The results showed that the proposed method is a useful tool to adjust and assess frequency-based protection so that an unscheduled islanding event can result in a stable island. In addition, the validation of the results confirmed the coherency of the graphical method.

中文翻译：

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评估分布式同步发电机有意孤岛技术可行性的图解方法


本文提出了一种图解方法来评估分布式同步发电机有意孤岛的可行性。该方法基于性能曲线和限制曲线的组合。这些曲线基于公共耦合点频率保护的孤岛检测能力以及其端子处的发电机保护。当将孤岛检测时间、限制时间和有功功率不平衡联系起来时，这些曲线的交点定义了两个运行区域：i)有利的孤岛形成区域，其中带电岛的运行稳定，以及ii)非孤岛形成区域。 - 不适宜孤岛形成的有利岛屿形成区。结果表明，所提出的方法是调整和评估基于频率的保护的有用工具，以便意外孤岛事件能够导致稳定的孤岛。此外，结果的验证证实了图形方法的一致性。