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Dynamic Load Models for Industrial Facilities Open Access


Other title
Variable frequency drives
Template-based Load Modeling technique
Industrial facilities
Dynamic load models
Type of item
Degree grantor
University of Alberta
Author or creator
Liang, Xiaodong
Supervisor and department
Xu, Wilsun (Department of Electrical and Computer Engineering)
Examining committee member and department
Zhao, Qing (Department of Electrical and Computer Engineering)
Zareipour, Hamidreza (Department of Electrical and Computer Engineering, University of Calgary)
Li, Yunwei (Ryan) (Department of Electrical and Computer Engineering)
Mohamed, Yasser Abdel-Rady (Department of Electrical and Computer Engineering)
Xu, Wilsun (Department of Electrical and Computer Engineering)
Department of Electrical and Computer Engineering
Energy Systems
Date accepted
Graduation date
Doctor of Philosophy
Degree level
Industrial facilities connected to power transmission systems typically draw large amount of power and have complex dynamic responses to system disturbances. Traditional load modeling approaches cannot establish adequate dynamic models especially for future industrial facilities in power systems planning studies. In this thesis, a new concept, the template-based load modeling technique along with template scaling and model equivalence algorithms, is proposed to address this issue. This method requires minimal user input and can be implemented in a database program for a wide variety of industrial facilities. Oil refinery facilities are used as an example to illustrate the proposed technique. Variable frequency drives (VFDs) are increasingly used in industrial facilities, however, dynamic models for motor drive systems suitable for power systems dynamic studies are not available. Voltage sags occur when power systems experience short-circuit faults, which is typically the starting point of power systems dynamic simulation. VFDs will trip when they experience a relatively large voltage sag (>20% - 30% voltage drop). As a result, there is no need to include VFDs in dynamic studies. Based on the finding, a simple procedure to determine if a VFD needs to be included for dynamic studies is proposed in this thesis. When VFDs experience mild voltage disturbances and are able to ride through, the equivalent dynamic model for motor drive systems is proposed. These models are created by the linearization approach, voltage dependence and frequency dependence are both considered. Dynamic models for VSI and cascaded inverter drives and their induction motor loads are developed. Aggregation algorithms for motor drive systems are proposed to achieve load equivalence facility wide. A generic dynamic load model structure covering all types of commonly used loads including motor drive systems is proposed for industrial facilities. A procedure is provided on how to obtain the final load model, which is tailored from the generic structure based on load types practically involved in an industrial facility of interest.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
Xiaodong Liang, Wilsun Xu, C.Y. Chung, Walmir Freitas, and Kun Xiong, “Dynamic Load Models for Industrial Facilities”, IEEE Transactions on Power Systems, Vol. 27, No. 1, February 2012, Page(s): 69-80.Xiaodong Liang, and C.Y. Chung, “Bus Split Algorithm for Aggregation of Induction Motors and Synchronous Motors in Dynamic Load Modeling”, Proceedings of 2013 IEEE Industrial and Commercial Power Systems Conference (I&CPS), Stone Mountain, GA, USA, April 30 – May 03, 2013.

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