Protective relaying of inverter-dominated microgrids

微电网是提高输电系统短路时电网恢复能力的巨大资产。然而，如果微电网在其自身边界内发生短路时没有得到适当的保护，微电网提供的弹性将处于危险之中。因此，微电网需要一个可靠的保护系统，以提供预期的功能和服务。然而，尽管对微电网控制和运行进行了广泛的研究**，迄今为止还没有制造出微电网专用继电器。本研究**将调查不同类型的商用微电网保护元件的运行情况。**将揭示可能导致继电器故障的DER单元故障行为的具体特征，并确定**潜在的脆弱保护元件和微电网条件/拓扑结构。这项研究的结果将向加拿大太阳能公司揭示哪种保护方法适合其微电网测试设施，以及应该如何设置各自的设备。这些结果还将揭示在故障条件下如何控制DER单元以防止保护系统故障。

A microgrid is a tremendous asset to improve the grid resilience during short-circuits in the transmission**system. However, the resilience offered by a microgrid will be in jeopardy if the microgrid is not properly**protected during the short-circuits that occur within its own boundaries. Thus, a microgrid requires a reliable**protection system in order to offer the expected features and services. Nevertheless, despite extensive research**into microgrid control and operation, no microgrid-specific relay has been manufactured to date. This study**will investigate the operation of different types of commercially available protective elements for microgrids.**Specific features of DER units' fault behaviour that can lead to relay malfunction will be unveiled, and**potentially vulnerable protective elements and microgrid conditions/topologies will be identified. The results of**this study will reveal to Canadian Solar which protection methods are appropriate for its microgrid testing**facility and how the respective devices should be set up. These results will also reveal how DER units should**be controlled during fault conditions to prevent malfunction of the protection system.