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Rapid islanding detection using multi-level inverter for grid-interactive PV system

机译：并网光伏系统中使用多级逆变器的快速孤岛检测

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摘要

A novel reference signal generator is combined with a multi-level inverter to form a rapid islanding detection scheme for grid-interactive PV system. The reference signal generator can easily be synchronized with the utility grid signal and produced a fixed magnitude and very low total harmonic distortion (THD) sinusoidal signal which is in phase with the utility grid signal. Unlike conventional phase-locked loop (PLL) circuitry, the reference signal generator can also provide a fixed magnitude sinusoidal signal even if the utility grid is disconnected and automatically re-synchronous with the grid rapidly. Consequently, seamless transfer between grid-connected and stand-alone modes could easily be achieved if anti-islanding protection is not required. If a saturation element is applied to the raw reference signal followed by the synthesis of the truncated signal using a multi-level inverter, the distinct flat-top feature of the synthesized signal can quickly and easily be identified if the network is in islanding mode at the point of common coupling. Experimental results are included to demonstrate the effectiveness of the proposed detection scheme.
机译：一种新颖的参考信号发生器与多电平逆变器相结合，形成了用于电网交互式光伏系统的快速孤岛检测方案。参考信号发生器可以轻松地与公用电网信号同步，并产生与公用电网信号同相的固定幅度和非常低的总谐波失真（THD）正弦信号。与常规锁相环（PLL）电路不同，即使公用电网断开连接并迅速与电网自动重新同步，参考信号发生器也可以提供固定幅度的正弦信号。因此，如果不需要防孤岛保护，则可以轻松实现并网和独立模式之间的无缝转换。如果将饱和元件应用于原始参考信号，然后使用多电平逆变器对截断的信号进行合成，则在网络处于孤岛模式时，可以快速轻松地识别出合成信号的明显平坦特征。共同耦合点。实验结果包括在内，以证明所提出的检测方案的有效性。

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