Islanding detection is imperative for the protection of distribution system supported by distributed generation. The accuracy of islanding detection technique mainly depends on the selection of suitable parameter. In this work, the 6 different power system parameters are classified based on sensitivity and performance ability. This is the basic step in the selection of suitable parameter for islanding detection technique. The behavior of different power system parameters is examined using mathematical morphology by considering all possible islanding and non-islanding situations. It has been found, from data interpretation, that dilated reactive power parameter using inclined line structuring element indicates the best competence, among the other parameters, to detect the minute disturbances in power supply. Further, the selection of dilated reactive power parameter is justified mathematically to validate its significance. Moreover, islanding detection technique is proposed consisting of dilated reactive power parameter to distinguish the islanding from other events of similar signatures.

孤岛检测对于保护分布式发电支持的配电系统至关重要。孤岛检测技术的准确性主要取决于合适参数的选择。在这项工作中，根据灵敏度和性能将6个不同的电力系统参数进行分类。这是为孤岛检测技术选择合适参数的基本步骤。通过考虑所有可能的孤岛和非孤岛情况，使用数学形态学检查了不同电力系统参数的行为。从数据解释中发现，使用斜线结构元素来扩大无功功率参数在检测其他微小的电源干扰方面表现出最好的能力。进一步，数学上证明了膨胀无功功率参数的选择是合理的，以验证其重要性。此外，提出了由扩张的无功功率参数组成的孤岛检测技术，以将孤岛与具有相似特征的其他事件区分开。