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balanced-realizations
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A new approach to reduce the dynamic order of induction generators
, Article International Journal of Power and Energy Systems ; Volume 27, Issue 4 , 2007 , Pages 315-319 ; 10783466 (ISSN) ; Behzadi Rafi, S ; Sharif University of Technology
Acta Press
2007
Abstract
Various attempts have been made to derive linearized, reduced order models of induction generators. Due to the fact that there is usually numerous number of these machines in wind power plants, these models provide great facilities in calculations, and therefore are used widely in power system transient stability studies. In this paper, some of these methods are discussed and compared and then a method known as "balanced realizations" is used to reduce the dynamic order of the machine. Computer simulation shows that the last method markedly improves the accuracy of the resulting reduced order model. The improvement is demonstrated by comparing the response characteristics predicted by each...
Development of Low-order Model/controllers for Oil Reservoir Smart Wells
,
M.Sc. Thesis
Sharif University of Technology
;
Pishvaie, Mahmoud Reza
(Supervisor)
Abstract
Upstream oil industry operators have turned to optimal production methods for further recoveries, such as smart wells. Control algorithms for smart wells must be equipped with online measurements, in other words, reflected in the feedback philosophy. On the other hand, after discretization, an oil reservoir's dynamic and control-driven model becomes a realization or a large-scale and sparse state space. One way to deal with this problem and provide an appropriate model for the design of smart well controllers is to use appropriate reservoir dimensional reduction methods. Therefore, to design low-order controllers, a study must first be performed at the level of the reservoir model and its...
Analysis of frequency-dependent network equivalents in dynamic harmonic domain
, Article Electric Power Systems Research ; Volume 193 , 2021 ; 03787796 (ISSN) ; Hajipour, E ; Vakilian, M ; Rouzbehi, K ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Rational function-based models have proved to be very efficient for accurate frequency-dependent modeling of power system components. These models are able to characterize the components terminal behaviours (analysing the admittance matrix) for nodal analysis. This provides a fast convergence and inherent stability to the solution routine of the model. This work presents a general framework for interfacing the dynamic phasor method to the rational models. That would be promising for the electromagnetic transient analysis (under harmonic distortion), in the frequency domain. Therefore, Y-element rational pole-residue models (employing the vector fitting method) are developed. Moreover, the...