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Energies 2017, 10(3), 308;

Angle Control-Based Multi-Terminal Out-of-Step Protection System

Institute of Power Engineering, Riga Technical University, Azenes 12 k-1, Riga, LV-1048, Latvia
IEEE Member, Brown Bovery Str.7, Baden 5401, Switzerland
Author to whom correspondence should be addressed.
Academic Editor: Akhtar Kalam
Received: 18 January 2017 / Revised: 20 February 2017 / Accepted: 24 February 2017 / Published: 4 March 2017
(This article belongs to the Section Electrical Power and Energy System)
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From time to time a sequence of unexpected and overlapping contingencies may lead to power system angular instability and even blackouts if not addressed adequately by means of an out-of-step (OOS) protection system. The motivation of the paper is an attempt to develop a workable prototype of the OOS protection system. The deficiencies of the protection currently used in the Latvian Power System network are highlighted and a new protection structure is proposed. The protection system comprises of several strategically located terminals, exchanging information in real time by means of a communication network. The OOS condition detection method is based on system-wide generation sources, electromotive forces, vectors, and angle control. The network splitting decision is based on generator coherence evaluation. Protection terminals determine online the groups of coherent generators and choose the splitting boundary from a predefined transmission lines (TLs) cut sets list. The protection system structure, algorithm of operation, and possible IEC 61850 communication standard-based implementation are described. View Full-Text
Keywords: power system; out-of-step (OOS) protection; synchronized measurements; generators coherence; IEC 61850 standard power system; out-of-step (OOS) protection; synchronized measurements; generators coherence; IEC 61850 standard

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Sauhats, A.; Utans, A.; Antonovs, D.; Svalovs, A. Angle Control-Based Multi-Terminal Out-of-Step Protection System. Energies 2017, 10, 308.

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