Abstract
Wind farms (WFs) can be considered as reliable high power generators. Integration of these resources into highvoltage networks can cause different transmission line (TL) protection issues. These issues have resulted from fluctuations in the wind turbines' input, bringing extreme changes in the inherent operational and structural parameters of WFs. Due to the speed variation of wind, the fluctuations of power in wind farms are unpredictable. Moreover, the number of turbines in these farms may be changed occasionally. In these cases, the protective relays, especially distance relays, should deal with these harsh conditions. This paper tries to identify and assess the parameters that affected the distance relays of TLs connected to WFs. To do so, different challenging scenarios of the network in faulty conditions and WF itself have been considered. The investigations of different conditions are performed in the DigSilent PowerFactory software, and the results are presented as different comprehensive scenarios. The results demonstrate that the performance of distance relays in such conditions is not reliable, and an auxiliary approach is needed to improve the operation of the distance relays in TLs connected to WFs.
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