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Title:Line-limit-preserving power system equivalents
Author(s):Jang, Wonhyeok
Director of Research:Overbye, Thomas J
Doctoral Committee Chair(s):Overbye, Thomas J
Doctoral Committee Member(s):Sauer, Peter W; Chen, Deming; Zhu, Hao; Bose, Subhonmesh
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Power system equivalent
Ward equivalent
Line limit
Transfer capability
Abstract:This dissertation develops methods to create power system equivalents that preserve thermal line limits. Existing equivalent methods do not retain thermal limits of equivalent lines, which may result in the transfer capability of the equivalent case differing significantly from that of the original case. Hence, power system equivalents have not been used for studies regarding line limits such as optimal power flow, security constrained optimal power flow, etc. However, recently there has been a need to create limit-preserving equivalents (LPEs) for studying power markets and environmental issues. Therefore, the goal of this research has been to assign meaningful values to equivalent line limits instead of a zero or infinity, which have been used in the industry. Three methods are presented to develop LPEs based on total transfer capability and available transfer capability. They are able to determine if a single bus or group of buses to be equivalenced has an exact solution. If it has an exact solution, equivalent line limits are assigned with little computation. In case of non-exact solution, three algorithms are capable of providing under-, best, and overestimates of equivalent line limits which can be used for different applications. Each algorithm has distinctive advantages and disadvantages and they are described in detail. All three algorithms are applied to various cases and the results are compared to show the differences. With the development of these methods, the use of equivalents will increase in various studies of power systems.
Issue Date:2017-04-21
Type:Text
URI:http://hdl.handle.net/2142/97426
Rights Information:Copyright 2017 Wonhyeok Jang
Date Available in IDEALS:2017-08-10
Date Deposited:2017-05


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