A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions
Power system rotor-angle unstable conditions may cause undesired operation of distance relays, resulting in the unnecessary switching of lines. To prevent the possible undesired operation of distance relays, a protection type known as out-of-step blocking is used. This protection type is complemente...
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University of Cape Town
2016
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Online Access: | http://hdl.handle.net/11427/22487 |
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ndltd-netd.ac.za-oai-union.ndltd.org-uct-oai-localhost-11427-224872020-12-10T05:11:02Z A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions Van Eyssen, Juanita Petroianu, Alexander Electrical Engineering Power system rotor-angle unstable conditions may cause undesired operation of distance relays, resulting in the unnecessary switching of lines. To prevent the possible undesired operation of distance relays, a protection type known as out-of-step blocking is used. This protection type is complemented by another type of protection, known as out-of-step tripping protection. The tripping protection's main functions are to detect total loss of synchronism and send tripping signals to selected locations in the system to initiate islanding. In this research the application of out-of-step blocking and tripping protection was investigated. The motivation for the research was provided by system unstable incidents that occurred in Eskom, the electricity utility of South Africa. Detailed out-of-step protection investigations indicated that the out-of-step blocking and tripping protection applied according to a method which is based on an existing approach failed to detect the unstable conditions. In summary, the detailed investigations showed that the existing approach of applying out-of-step blocking and tripping protection is not adequate as it does not allow the necessary observability1 and correct detection of rotor-angle unstable conditions. 2016-11-10T14:11:48Z 2016-11-10T14:11:48Z 1999 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/22487 eng application/pdf University of Cape Town Faculty of Engineering and the Built Environment Department of Electrical Engineering |
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English |
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Doctoral Thesis |
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Electrical Engineering |
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Electrical Engineering Van Eyssen, Juanita A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions |
description |
Power system rotor-angle unstable conditions may cause undesired operation of distance relays, resulting in the unnecessary switching of lines. To prevent the possible undesired operation of distance relays, a protection type known as out-of-step blocking is used. This protection type is complemented by another type of protection, known as out-of-step tripping protection. The tripping protection's main functions are to detect total loss of synchronism and send tripping signals to selected locations in the system to initiate islanding. In this research the application of out-of-step blocking and tripping protection was investigated. The motivation for the research was provided by system unstable incidents that occurred in Eskom, the electricity utility of South Africa. Detailed out-of-step protection investigations indicated that the out-of-step blocking and tripping protection applied according to a method which is based on an existing approach failed to detect the unstable conditions. In summary, the detailed investigations showed that the existing approach of applying out-of-step blocking and tripping protection is not adequate as it does not allow the necessary observability1 and correct detection of rotor-angle unstable conditions. |
author2 |
Petroianu, Alexander |
author_facet |
Petroianu, Alexander Van Eyssen, Juanita |
author |
Van Eyssen, Juanita |
author_sort |
Van Eyssen, Juanita |
title |
A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions |
title_short |
A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions |
title_full |
A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions |
title_fullStr |
A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions |
title_full_unstemmed |
A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions |
title_sort |
new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions |
publisher |
University of Cape Town |
publishDate |
2016 |
url |
http://hdl.handle.net/11427/22487 |
work_keys_str_mv |
AT vaneyssenjuanita anewmethodofutilisingstabilitystudyresultsinapplyingoutofstepprotectiontoallowobservabilityofrotorangleunstableconditions AT vaneyssenjuanita newmethodofutilisingstabilitystudyresultsinapplyingoutofstepprotectiontoallowobservabilityofrotorangleunstableconditions |
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1719369069519437824 |