2026-09-20T16:33:39Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/20856 2023-07-10 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Sauer, Peter W. Mak, Fong Kiong 2011-05-07T12:51:18Z 2011-05-07T12:51:18Z 10000-01-01 1990 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 AAI9026260 (UMI)AAI9026260 http://hdl.handle.net/2142/20856 eng Copyright 1990 Mak, Fong Kiong Engineering, Sanitary and Municipal Engineering, System Science Analysis and control of voltage dynamics in electric power systems text Electrical and Computer Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.