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Method for adaptive overcurrent protection of distribution systems with Distributed synchronous Generators

机译：具有分布式同步发电机的配电系统自适应过电流保护方法

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The increase of Distributed Generators (DG) has encouraged the operation of these generators in islanded mode or intentional islanding. Such operation mode can increase the system reliability, once in the event of network failure the supply of critical consumers will be maintained by the DGs. However, it is necessary to consider that the fault current is considerably reduced when the system is in intentional islanding, and the overcurrent protection setting must be adapted in order to take into account the new fault current level. This paper proposes the use of adaptive protection to change the overcurrent protection setting based on the identification of the system operating state. The system operating state is identified by the use of an active measurement technique, which identifies its operating condition by the impedance level of the grid. Simulation results show that the proposed scheme can be used to update the protection settings for the islanded operation condition.
机译：分布式发电机（DG）的增加鼓励了这些发电机以孤岛模式或有意孤岛运行。这种操作模式可以提高系统的可靠性，一旦发生网络故障，DG将维持关键用电设备的供应。但是，有必要考虑到，当系统处于故意孤岛状态时，故障电流会大大降低，并且必须调整过电流保护设置，以考虑新的故障电流水平。本文提出了基于系统运行状态识别的自适应保护来更改过流保护设置。通过使用主动测量技术来识别系统运行状态，该测量技术通过电网的阻抗水平来确定其运行状态。仿真结果表明，该方案可用于孤岛工况的保护设置更新。

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