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Abstract:   (294 Views)
This paper presents a novel impedance-based approach for out-of-step (OOS) protection of a synchronous generator. Most popular and commonly used approaches for detecting OOS conditions are based on the measurement of positive sequence impedance at relay location. However, FACTS devices change the measured impedance value and thus disrupt the performance of impedance-based relay function. In this paper, the performance of synchronous generator OOS protection function connected to the transmission line in the presence of a static synchronous compensator (STATCOM) is investigated. Moreover, an analytical adaptive approach is used to eliminate the effect of STATCOM. This approach requires only the remote bus voltage and current phasors to be sent to the relay location via a communication channel. Simulation results show that, STATCOM changes impedance trajectory and causes the incorrect operation of OOS relay. Furthermore, the proposed approach corrects the relay mal-operation and improves the accuracy of OOS impedance-based function when the STATCOM is used in system.
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  • The STATCOM changes the impedance path and interferes with the OOS relay;
  • The operation modes of STATCOM have almost same effect on the measured impedance;
  • Proposed an analytical approach to correct the impedance deviation caused by the STATCOM;

Type of Study: Research Paper | Subject: Protection
Received: 2019/03/10 | Accepted: 2019/06/05 | Published: 2019/06/07

Creative Commons License
© 2019 by the authors. Licensee IUST, Tehran, Iran. This is an open access journal distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license.