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首页> 外文期刊>Engineering Technology and Applied Science Research >Evaluation of Passive Islanding Detection Methods for Line to Ground Unsymmetrical Fault in Three Phase Microgrid Systems: Microgrid Islanding Detection Method
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Evaluation of Passive Islanding Detection Methods for Line to Ground Unsymmetrical Fault in Three Phase Microgrid Systems: Microgrid Islanding Detection Method

机译：三相微电网系统中无源岛检测方法的探测方法：微电网检测方法

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摘要

Distributed Generators (DGs) are incorporated in the power distribution systems to develop green energies in microgrids. Islanding is a challenging task in a microgrid. Different types of islanding methods, e.g. local and remote methods, have been developed for handling this task, with local methods being easier to implement, while remote methods are communication-based and costly. The local methods are classified as passive, active, and hybrid, out of which the passive methods are more simple and economical. In this paper, a passive islanding detection method is proposed to detect single line to ground fault. This fault is considered to represent the 60 to 70% of the total un-intentional faults of this category. The available passive methods cannot detect islanding at lower power mismatches as the variations in voltage and frequency fall within thresholding values. In this method, the voltage signals are first retrieved at the targeted DG output and then the phase angle is estimated. Finally, the phase angle is differentiated to get Rate Of Change Of Voltage Phase Angle (ROCOVPA) to detect islanding, and then it is compared with the Rate Of Change Of Frequency (ROCOF) at zero percent power mismatch. Simulation results depict that the ROCOVPA is more effective than ROCOF. The proposed method not only reduces detection time and NonDetection Zone (NDZ) but is also stable during non-islanding cases like load connection and disconnection to avoid nuisance tripping.
机译：分布式发电机（DGS）纳入配电系统中，以在微电网中开发绿色能量。岛屿在微电网中是一个具有挑战性的任务。不同类型的岛屿方法，例如已经开发了本地和远程方法，用于处理此任务，本地方法更容易实现，而远程方法是基于通信和昂贵的。本地方法被归类为被动，有效和混合动力，其中无源方法更简单且经济。本文提出了一种被动岛检测方法来检测地面故障的单线。该故障被认为是表示本类别的植物总故障的60％至70％。可用的被动方法无法在较低功率不匹配时检测孤岛，因为电压和频率的变化落在阈值的值内。在该方法中，首先在目标DG输出处检索电压信号，然后估计相位角。最后，相位角差异化以获得电压相位角（RoCovPA）的变化率以检测岛屿，然后将其与零百分比功率不匹配的频率变化率（Rocof）进行比较。仿真结果描述了rocovpa比rocof更有效。所提出的方法不仅减少了检测时间和非竞选区域（NDZ），而且在像负载连接和断开的非岛形情况下也是稳定的，以避免滋扰绊倒。

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