{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/20856"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/20856","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Analysis and control of voltage dynamics in electric power systems","abstract":"This research involves the study of the voltage dynamics of power systems subject to large disturbances. The thesis is divided into two parts: analysis and control of voltage dynamics. In the analysis section, the interaction of machines dynamics with the dynamics of decentralized load voltage controls, such as ULTC (under load tap changers), is investigated. A detailed reduced-order machine dynamical model is proposed for more reliable study of voltage-related problems. The main contribution of the analytical work is in recognizing voltage problems as unacceptable operating conditions. Mathematical and operational conditions are derived for distinguishing among steady-state insecure, oscillatory, and transiently unstable voltage operating conditions as particular categories of the general voltage problem operating conditions.","abstract_html":"This research involves the study of the voltage dynamics of power systems subject to large disturbances. The thesis is divided into two parts: analysis and control of voltage dynamics. In the analysis section, the interaction of machines dynamics with the dynamics of decentralized load voltage controls, such as ULTC (under load tap changers), is investigated. A detailed reduced-order machine dynamical model is proposed for more reliable study of voltage-related problems. The main contribution of the analytical work is in recognizing voltage problems as unacceptable operating conditions. Mathematical and operational conditions are derived for distinguishing among steady-state insecure, oscillatory, and transiently unstable voltage operating conditions as particular categories of the general voltage problem operating conditions.","abstract_has_math":false,"creators":["Mak, Fong Kiong"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Electrical Engineering","degree_department":null,"school":null,"contributors":["Sauer, Peter W."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:51:18Z","date_published":"2011-05-07T12:51:18Z","updated_at":"2026-07-22T22:25:16Z","subjects":["Engineering, Sanitary and Municipal","Engineering, System Science"],"languages":["eng"],"rights":["Copyright 1990 Mak, Fong Kiong"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9026260","(UMI)AAI9026260"],"render_values":[{"text":"AAI9026260","href":null,"code":true},{"text":"(UMI)AAI9026260","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/20856","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Sauer, Peter W."]},{"key":"dc:creator","label":"Author","values":["Mak, Fong Kiong"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:51:18Z","10000-01-01","1990"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering, Sanitary and Municipal","Engineering, System Science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1990 Mak, Fong Kiong"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9026260","(UMI)AAI9026260","http://hdl.handle.net/2142/20856"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This research involves the study of the voltage dynamics of power systems subject to large disturbances. The thesis is divided into two parts: analysis and control of voltage dynamics. In the analysis section, the interaction of machines dynamics with the dynamics of decentralized load voltage controls, such as ULTC (under load tap changers), is investigated. A detailed reduced-order machine dynamical model is proposed for more reliable study of voltage-related problems. The main contribution of the analytical work is in recognizing voltage problems as unacceptable operating conditions. Mathematical and operational conditions are derived for distinguishing among steady-state insecure, oscillatory, and transiently unstable voltage operating conditions as particular categories of the general voltage problem operating conditions.","In the control section, nonlinear excitation controllers are proposed so that the system reactive power reserve, which is believed to be the main cause of any voltage problems, is more efficiently used. The performance of the proposed controls, subject to small and large disturbances, respectively, is compared with the conventional IEEE excitation controls which include power system stabilizers and governor dynamics as well.","Made available in DSpace on 2011-05-07T12:51:18Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9026260.pdf: 6275448 bytes, checksum: 99f7a0231b9eb4a330eadcc2330a2ac1 (MD5) Previous issue date: 1990","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:46:46Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:21:01-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Analysis and control of voltage dynamics in electric power systems"]}]}],"canonical_facts":{"dc:contributor":["Sauer, Peter W."],"dc:creator":["Mak, Fong Kiong"],"dc:date":["2011-05-07T12:51:18Z","10000-01-01","1990"],"dc:description":["This research involves the study of the voltage dynamics of power systems subject to large disturbances. The thesis is divided into two parts: analysis and control of voltage dynamics. In the analysis section, the interaction of machines dynamics with the dynamics of decentralized load voltage controls, such as ULTC (under load tap changers), is investigated. A detailed reduced-order machine dynamical model is proposed for more reliable study of voltage-related problems. The main contribution of the analytical work is in recognizing voltage problems as unacceptable operating conditions. Mathematical and operational conditions are derived for distinguishing among steady-state insecure, oscillatory, and transiently unstable voltage operating conditions as particular categories of the general voltage problem operating conditions.","In the control section, nonlinear excitation controllers are proposed so that the system reactive power reserve, which is believed to be the main cause of any voltage problems, is more efficiently used. The performance of the proposed controls, subject to small and large disturbances, respectively, is compared with the conventional IEEE excitation controls which include power system stabilizers and governor dynamics as well.","Made available in DSpace on 2011-05-07T12:51:18Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9026260.pdf: 6275448 bytes, checksum: 99f7a0231b9eb4a330eadcc2330a2ac1 (MD5) Previous issue date: 1990","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:46:46Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:21:01-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9026260","(UMI)AAI9026260","http://hdl.handle.net/2142/20856"],"dc:language":["eng"],"dc:rights":["Copyright 1990 Mak, Fong Kiong"],"dc:subject":["Engineering, Sanitary and Municipal","Engineering, System Science"],"dc:title":["Analysis and control of voltage dynamics in electric power systems"],"dc:type":["text"],"thesis:degree_discipline":["Electrical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:16Z"}