Virtual synchronous machine (VSM) technology is an attractive control method for an inverter-based distributed generation (DG) due to having the voltage, and frequency support functionality. Embedding an anti-islanding protection (AIP) scheme with a high accuracy is a requirement for DG inverters due to the safety concern of the personnel, and hazardous operation. This paper presents a novel hybrid AIP scheme for VSM inverters for integration of DG sources into the grid. The main advantage of this AIP scheme is that the proposed scheme can be embedded into the control of the DG inverters without a need of additional part in the hardware of the inverter, and any change in the controller. A detailed modeling of its implementation with the inverter control is presented, and the performance of the AIP scheme is verified by simulations, and experiments. It is shown that the AIP scheme detects the islanding condition successfully, and isolates the inverter from the grid after it experiences an islanding condition.

中文翻译：

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分布式发电中VSM逆变器的防孤岛保护

由于具有电压和频率支持功能，虚拟同步机（VSM）技术是基于逆变器的分布式发电（DG）的一种有吸引力的控制方法。DG逆变器由于需要人员安全和危险操作，因此需要嵌入高精度的防孤岛（AIP）方案。本文提出了一种用于VSM逆变器的新型混合AIP方案，用于将DG源集成到电网中。此AIP方案的主要优点是，可以将拟议的方案嵌入到DG逆变器的控制中，而无需在逆变器的硬件中增加任何部分，也无需更改控制器。给出了其在逆变器控制下实现的详细模型，并通过仿真和实验验证了AIP方案的性能。