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A reference current perturbation method for islanding detection of a multi-inverter system

机译：用于多逆变器系统孤岛检测的参考电流扰动方法

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An active islanding detection method without destabilizing the system gives the advantage of accurate decision and the capability to keep the micro-grid energized while islanding occurs. Harmonic and perturbation current injection are such active methods, but none in the literature has discussed about islanding detection in multi-inverter systems. This paper proposes an active islanding detection method for multi inverter systems which works based on perturbation of direct (d-) and quadrature (q-) axis reference currents of inverters. The perturbations are synchronized according to voltage phase at point of common coupling (PCC) to avoid interaction. The q-axis voltage at PCC is considered as the output of system and the frequency response (FR) of system is obtained analytically for normal and island modes. The results show that the FR of system especially its phase has a noticeable difference in normal and island modes, which islanding can be detected by comparing the phase of system FR with a proper threshold. At the end, the analytical results are confirmed by some simulations using the software PSCAD/EMTDC. (C) 2015 Elsevier B.V. All rights reserved.
机译：一种主动的孤岛检测方法，不会破坏系统的稳定性，它具有准确决策的优势，并且能够在发生孤岛时保持微电网的通电。谐波注入和微扰电流注入是这样的有效方法，但是文献中没有讨论多逆变器系统中的孤岛检测。本文提出了一种用于多逆变器系统的主动孤岛检测方法，该方法基于对逆变器的直流（d-）和正交（q-）轴参考电流的扰动来工作。扰动根据公共耦合点（PCC）的电压相位进行同步，以避免相互作用。 PCC处的q轴电压被认为是系统的输出，并且对于正常模式和孤岛模式，可以通过分析获得系统的频率响应（FR）。结果表明，系统的FR尤其是其相位在正常模式和孤岛模式下都有明显的差异，可以通过将系统FR的相位与适当的阈值进行比较来检测出孤岛。最后，通过使用软件PSCAD / EMTDC进行的一些模拟确认了分析结果。 （C）2015 Elsevier B.V.保留所有权利。

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