The number of DGs located at distribution site, which uses renewable energy sources, forms a Micro-grid system. The problem of using DG with the utility is unplanned islanding. This paper has focused on passive islanding detection method (IDM) which is easy for implementation, cheaper and proficient. The suggested method tried to eradicate the disadvantage of passive conventional IDM. Low impedance grid always immersed small deviation of inverter output in the grid-connected mode, but whenever the grid is disconnected (i.e. in islanding condition) this stability effect of the grid is absent, which is picked up for islanding detection in the proposed method. In this paper, voltage ripple-based passive IDM is evaluated and tested under various operating conditions. The proposed method is easily working on condition like generated power and load power are the same and it was found that technique is robust, without NDZ and can detect islanding within 0.3 sec. Also the proposed method is able to differentiate islanding and non-islanding scenarios, which is helpful to stop unnecessary malfunctioning of DGs.

位于配电点的 DG 数量，使用可再生能源，形成一个微电网系统。将 DG 与公用事业一起使用的问题是计划外孤岛。本文重点研究了易于实施、成本低廉且熟练的被动孤岛检测方法（IDM）。建议的方法试图消除被动传统 IDM 的缺点。低阻抗电网在并网模式下始终沉浸在逆变器输出的小偏差中，但每当电网断开（即在孤岛条件下）不存在网格的这种稳定性影响，在所提出的方法中将其拾取用于孤岛检测。在本文中，基于电压纹波的无源 IDM 在各种操作条件下进行了评估和测试。所提出的方法很容易在发电功率和负载功率相同的情况下工作，并且发现该技术是稳健的，没有 NDZ 并且可以在 0.3 秒内检测到孤岛。此外，所提出的方法能够区分孤岛和非孤岛场景，这有助于阻止 DG 不必要的故障。