Remedial action schemes for power system performance enhancement using protective relaying

Hesaraki, Reza (2020) Remedial action schemes for power system performance enhancement using protective relaying. Masters thesis, Memorial University of Newfoundland.

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Nowadays, according to the improvement of industries, and the growth of the population, the need for high-quality energy is felt more and more. One of the significant challenges in designing distributed power networks is providing reliable protection with the target of decreasing blackouts. This goal can be achieved by detecting faults in the power system and action to correct or remove the faults. In most cases, taking correct and quick remedial action to protect the power system is done by tripping. Generally, the protective relaying equipment is responsible for tripping in a power system. In this thesis, various types of remedial action schemes for power system performance enhancement using protective relaying are studied in detail. The concept of power system protection consists of protection components, and their functionality is illustrated. Furthermore, several types of protective relays, and their general operating and design considerations are briefly investigated. Several protective relays such as analog overcurrent relay, digital overcurrent relay, and digital under-over frequency relay are investigated, modeled, and simulated in this thesis. To study the power system frequency response, the System Frequency Response (SFR) model is derived and simulated in MATLAB Simulink environment, and the effect of some parameters of a generator on the system’s frequency response is examined. Additionally, a new method to model power system frequency response is proposed based on the factorial design method using the Design of Expert. The actual system and the final model are simulated, compared, and validated. The result shows that the model based on the proposed method can be used to estimate the system frequency response. The concept of load curtailment (load shedding) and its different methods are discussed. A conventional underfrequency load shedding relay is simulated in MATLAB software to show how load shedding relays can enhance power system performance. The significant factors which affect power system stability are identified. To show the effect of significant factors on power system stability, a standard IEEE 9-Bus and the IEEE 10-Generator 39-Bus New England Test System are simulated in the PowerWorld. Finally, the concept of autoreclosing is studied in detail. An autorecloser relay is designed, simulated, and examined in MATLAB Simulink, and the proposed relay’s units are explained. Optimal autoreclosing methods are also presented in this thesis.

Item Type: Thesis (Masters)
Item ID: 14521
Additional Information: Includes bibliographical references (pages 123-127).
Keywords: Power system, Protective relaying, Power system performance enhancement
Department(s): Engineering and Applied Science, Faculty of
Date: October 2020
Date Type: Submission
Digital Object Identifier (DOI):
Library of Congress Subject Heading: Protective relays; Electric power systems.

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