Abstract This paper presents a protection strategy based on active power flow direction, current magnitude and voltage sags to determine the existence of low impedance faults in inverter-dominated low voltage AC microgrids. Different fault situations are considered, concerning each element of the microgrid (line section, load, node and energy sources). Simulation is done in MATLAB/Simulink software. Microgrid was modelled based on CIGRE benchmark for network integration of renewable and distributed energy resources, considering the low voltage european distribution network characteristics. Inverter-based distributed generation units were modelled considering a control scheme composed by natural reference frame control and RMS current limiter. The results obtained from simulations indicate that the proposed strategy is able to protect the microgrid in any topology configuration or mode of operation, for all type of low impedance faults.

中文翻译：

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逆变器主导的低压交流微电网故障检测保护策略

摘要 本文提出了一种基于有功潮流方向、电流幅值和电压骤降的保护策略，以确定逆变器主导的低压交流微电网中是否存在低阻抗故障。考虑了不同的故障情况，涉及微电网的每个元素（线路段、负载、节点和能源）。仿真是在 MATLAB/Simulink 软件中完成的。考虑到欧洲低压配电网的特点，微电网基于可再生能源和分布式能源网络集成的 CIGRE 基准进行建模。考虑到由自然参考系控制和 RMS 电流限制器组成的控制方案，对基于逆变器的分布式发电机组进行建模。