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Load angle based loss of excitation protection scheme for parallel connected synchronous generators


Rostami, A and Rezaei, N and Jalilian, A and Naderi, B and Negnevitsky, M, Load angle based loss of excitation protection scheme for parallel connected synchronous generators, IEEE Transactions on Industry Applications, 58, (6) pp. 6960 - 6969. ISSN 1939-9367 (2022) [Refereed Article]

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DOI: doi:10.1109/TIA.2022.3193987


The main weaknesses of impedance-based loss-of-excitation (LOE) relay are its maloperation during the power system disturbances (PSDs) and its long detection time during LOE events. In this article, to tackle the mentioned problems, a new LOE protection scheme is proposed based on load angle (δ) variation of parallel synchronous generators (SGs) connected to a point of connection (POC). It will be shown that during a PSD, the variation of δ for all parallel SGs is similar such that their δ increases or decreases simultaneously. However, it will be shown that when the LOE occurs for one of the parallel SGs, the δ of faulty SG increases while other SGs will experience reduction in their δ. Hence, when more than one SG is connected to a POC, the LOE event can be discriminated from PSDs. In the proposed scheme, when one SG is connected to the grid, the impedance-based relay is employed to enable the developed method to detect LOE/PSD. Since in a real-world application, the outage rate of the parallel SGs in a power plant during the emergency situations, periodic services, etc., is very low on a yearly basis, the contribution of the impedance relay in the proposed scheme is quite limited to some special circumstances. Comprehensive simulation studies have been conducted in MATLAB/Simulink environment (R2017b); the results prove high efficiency of the proposed scheme.

Item Details

Item Type:Refereed Article
Keywords:Impedance-based relay, load angle, loss of excitation (LOE), synchronous generators (SGs) protection
Research Division:Engineering
Research Group:Electrical engineering
Research Field:Electrical energy generation (incl. renewables, excl. photovoltaics)
Objective Division:Energy
Objective Group:Renewable energy
Objective Field:Renewable energy not elsewhere classified
UTAS Author:Naderi, B (Dr Seyedbehzad Naderi)
UTAS Author:Negnevitsky, M (Professor Michael Negnevitsky)
ID Code:155396
Year Published:2022
Deposited By:Engineering
Deposited On:2023-02-17
Last Modified:2023-02-28

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