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首页> 外文会议>2013 48th International Universities' Power Engineering Conference >Risk of unintentional islanding in LV distribution networks with inverter-based DGs
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Risk of unintentional islanding in LV distribution networks with inverter-based DGs

机译：具有基于逆变器的DG的LV配电网络中无意孤岛的风险

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The number of small power Distributed Generation (DG) units connected to the distribution networks has increased particularly for photovoltaic (PV) applications. According to recently issued Italian standards, each DG unit is allowed to participate in the active and reactive power regulation, using specifically defined P-f and Q-V droop characteristics. Furthermore, these standards have introduced wider frequency and voltage thresholds allowed during normal operation of DG units. Therefore the risk of unintentional islanding operations is expected to increase, due to the possibility of the DG units to supply the loads with a wider voltage and frequency range without the protections interventions. In this paper, the impact of the loads' voltage and frequency dependence on the isolated grid's frequency and voltage deviation, during unintentional islanding operations, has been considered. The system has been modeled and analyzed through detailed dynamics simulations. The results show that, using a classical grid-connected inverter control system, the loads' voltage and frequency dependence may play a crucial role in determining the unintentional islanding operation and possible failure of the protections intervention.
机译：连接到配电网络的小功率分布式发电（DG）单元的数量已经增加，特别是对于光伏（PV）应用而言。根据最近发布的意大利标准，每个DG单元都可以使用专门定义的P-f和Q-V下垂特性参与有功和无功功率调节。此外，这些标准引入了在DG单元正常运行期间允许的更宽的频率和电压阈值。因此，由于DG单元无需保护干预就可以为负载提供更宽的电压和频率范围的可能性，无意孤岛操作的风险预计会增加。在本文中，考虑了在无意孤岛操作期间负载的电压和频率依赖性对隔离电网的频率和电压偏差的影响。该系统已通过详细的动力学仿真进行了建模和分析。结果表明，使用经典的并网逆变器控制系统，负载的电压和频率依赖性可能在确定意外的孤岛运行以及保护干预的可能失效方面起着至关重要的作用。

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