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Adaptive protection scheme for medium voltage systems with distributed generation and islanding detection

机译：具有分布式发电和孤岛检测的中压系统自适应保护方案

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Penetration of DGs into an existing power network have many impacts on the system, with the power system protection being one of the major issues. In this context, this paper proposes a novel adaptive protection scheme able to overcome all protection problems such as loss of coordination, bi-directionality, and islanding detection regardless of the type, number, location, and size of the connected DGs. The proposed method uses adaptive and communication relays located at both sides of each line to achieve complete isolation of the faulted line. The communication media used between relays is fiber optics. The main processor receives signals from all relays to determine the connection status of the system and sends flags refer to the Current-Time Characteristics (CCT) to each relay. Offline load-flow analysis and short circuit calculation are required to determine both value and direction of the current in each relay for each connection case, the results of load flow are used to determine the settings of each relay. ETAP program is used to simulate the tested system, and to perform the required analysis.
机译：DG渗透到现有的电力网络中会对系统产生许多影响，其中电力系统保护是主要问题之一。在这种情况下，本文提出了一种新颖的自适应保护方案，无论连接的DG的类型，数量，位置和大小如何，它都能克服所有保护问题，例如失去协调性，双向性和孤岛检测。所提出的方法使用位于每条线路两侧的自适应和通信继电器来实现故障线路的完全隔离。继电器之间使用的通信介质是光纤。主处理器从所有继电器接收信号以确定系统的连接状态，并向每个继电器发送参考“当前时间特性”（CCT）的标志。需要脱机潮流分析和短路计算来确定每种情况下每个继电器的电流值和方向，潮流结果用于确定每个继电器的设置。 ETAP程序用于模拟被测系统，并执行所需的分析。

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