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Overcurrent Directional Protection with PV System Integration

机译：光伏系统集成的过流方向保护

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In modern electric networks with Distributed Generation (DG) units the power flow is bidirectional, which makes the DG units contribute to power systems faults. This scenario causes variable short circuit current. The short-circuit current is variable due to the different penetration level of DG sources. When the number and capacity of the DG units increases, the coordination of the protective relays becomes more complex and challenging. It is required to accurately coordinate overcurrent directional relays to be able to discriminate and operate sequentially for faults in the protected zone, to avoid unnecessary trips. When the DG units are Photovoltaic (PV) systems, the problem is more complex since both the generation and the loads are variable. This paper presents case studies of overcurrent directional protection with different PV system penetration levels, using IEEE-9 bus test system. Relay settings are selected to ensure that the directional overcurrent relay trips selectively. DigSilent Power Factory software is used for modelling and simulations of the suggested operational scenarios.
机译：在具有分布式发电（DG）单元的现代电网中，潮流是双向的，这使DG单元导致电力系统故障。这种情况导致可变的短路电流。短路电流是由于DG源的渗透水平不同而变化的。当DG装置的数量和容量增加时，保护继电器的协调变得更加复杂和具有挑战性。需要准确地协调过电流方向继电器，以便能够对保护区内的故障进行区分和顺序操作，以避免不必要的跳闸。当DG装置是光伏（PV）系统时，问题会更加复杂，因为发电量和负荷都是可变的。本文介绍了使用IEEE-9总线测试系统对具有不同光伏系统穿透水平的过电流方向保护的案例研究。选择继电器设置以确保方向性过电流继电器有选择地跳闸。 DigSilent Power Factory软件用于对建议的操作方案进行建模和仿真。

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