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A New Islanding Detection Scheme for Multiple Inverter-Based DG Systems

机译：基于多逆变器的DG系统的孤岛检测新方案

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摘要

A new islanding detection technique is proposed for the application in multiple inverter-based distributed generation (DG) systems. In the proposed method, a harmonic current disturbance is imposed to the grid at one of the harmonic frequencies associated with the grid voltage. This is done by changing the equivalent parallel impedance of the grid-connected inverters. The output current of the grid-connected inverters at this specific harmonic frequency is used as the islanding detection signal. The harmonic resonance is imposed over a short time interval, hence the overall power quality is not significantly affected. As opposed to most of the active islanding detection methods, in the proposed method, no interference among parallel DGs is observed, which makes it well suited for the application in systems involving a large number of parallel inverter-based DGs. Comprehensive analyses are performed to investigate various technical aspects of the proposed scheme. The performance of the proposed method is verified using time-domain simulations carried out in Matlab/Simulink environment.
机译：提出了一种新的孤岛检测技术，以用于基于多个逆变器的分布式发电（DG）系统中。在所提出的方法中，谐波电流扰动以与电网电压相关的谐波频率之一施加到电网。这可以通过更改并网逆变器的等效并联阻抗来实现。在此特定谐波频率下，并网逆变器的输出电流用作孤岛检测信号。谐波谐振是在很短的时间间隔内施加的，因此总体电能质量不会受到明显影响。与大多数主动孤岛检测方法相反，在所提出的方法中，没有观察到并行DG之间的干扰，这使其非常适合在包含大量基于并行逆变器的DG的系统中应用。进行了综合分析，以研究所提议方案的各个技术方面。使用Matlab / Simulink环境中进行的时域仿真，验证了该方法的性能。

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