Distributed Generation (DG) integration, especially based on renewable energy resources, has gained great attention by power utilities and frequently utilized in the electrical distribution systems. However, DG integration imposes some risks towards system stability which may lead to system blackouts. This mainly occurs when the grid is decoupled from a portion of the distribution system consisting DGs while the total load demand is greater than total DGs output power. In order to overcome this problem, load shedding technique can be adopted to stabilize the system frequency. However, existing load shedding techniques were unable to accurately estimate the power imbalance due the variation in system loading. This results in excessive/inadequate load shedding to stabilize the system frequency. Moreover, random selection of the loads without load prioritization might cause vital loads to be shed. Therefore, in this paper, a new load shedding strategy for islanded distribution system is proposed. Polynomial regression analysis estimates the power mismatch while MILP optimization estimates optimal load combination for shedding. Furthermore, load priority (i.e., vital, non-vital, and semi-vital) is also considered to avoid disconnecting vital loads. Efficiency of the proposed scheme is evaluated on three different test systems. Validation is performed by modelling the proposed load shedding on PSCAD/EMTDC software for dynamic analysis. From the results, it can be analyzed that the proposed technique is superior compared to other techniques proposed in the literature.

分布式发电（DG）集成，尤其是基于可再生能源的分布式发电，受到电力公司的高度重视，并经常用于配电系统。然而，分布式电源集成对系统稳定性带来了一些风险，可能导致系统停电。这主要发生在电网与由 DG 组成的配电系统的一部分分离而总负载需求大于总 DG 输出功率时。为了克服这个问题，可以采用减载技术来稳定系统频率。然而，由于系统负载的变化，现有的减载技术无法准确估计功率不平衡。这会导致过度/不足的减载以稳定系统频率。而且，在没有负载优先级的情况下随机选择负载可能会导致重要负载脱落。因此，本文提出了一种新的孤岛配电系统减载策略。多项式回归分析估计功率失配，而 MILP 优化估计卸载的最佳负载组合。此外，负载优先级（即，重要的、非重要的和半重要的）也被考虑以避免断开重要负载。在三个不同的测试系统上评估了所提出方案的效率。验证是通过在 PSCAD/EMTDC 软件上对提议的减载建模进行动态分析来执行的。从结果中可以分析出，与文献中提出的其他技术相比，所提出的技术更优越。