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Proceedings ArticleDOI

Coherency of generators for inter-area modes using digital filter bank and principal component analysis

TL;DR: In this paper, coherent generators participating in an inter-area mode are identified from time synchronized phasor measurements using principal component analysis (PCA) for identifying generator coherency.
Abstract: In the present work, coherent generators participating in an inter-area mode are identified from time synchronized phasor measurements. In the first step, Zolotarev polynomial based filter bank (ZPBFB) is applied on the real power data of all generators obtained from phasor measurement units (PMUs) to decompose the given signal into monocomponents. The mono-components are then given to eigen realization algorithm (ERA) for modal frequency and damping. The decomposed signals of those generators participating in a particular inter-area mode are given to principal component analysis (PCA) for identifying generator coherency. The proposed method is demonstrated on IEEE two-area test system.
Citations
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Proceedings ArticleDOI
01 Oct 2018
TL;DR: An approach for identification of the most coherent generating units is proposed which exploits a decision tree (DT) algorithm based on synchronized data measured by phasor measurement units (PMUs) so as to provide accurate decisions for almost all possible disturbances in power systems.
Abstract: Identifying coherent generating units in power systems is an important step toward development of a reduced model for bulk electricity grid aiming at wide-area analysis and controlled islanding practices. In this paper, an approach for identification of the most coherent generating units is proposed which exploits a decision tree (DT) algorithm based on synchronized data measured by phasor measurement units (PMUs). Such DTs should be trained so as to provide accurate decisions for almost all possible disturbances in power systems. Three probabilistic parameters are, therefore, taken into account in a training stage including fault type, fault location, and the system load level at the time fault occurs. In order to generate the training dataset, different scenarios are simulated and appropriate attributes are extracted from voltage phasors. Furthermore, the most coherent generating units, which are the DT target, are determined in each scenario by evaluating the similarity between the frequency components existing in their speed variation signals. The effectiveness of the suggested approach is verified by its application to the 68-bus, 16-machine test system through which it reveals high accuracy in recognizing the most coherent generating units under various prevailing conditions in power grid.

19 citations


Cites methods from "Coherency of generators for inter-a..."

  • ...In [13], principal component analysis (PCA) is applied on mono-components obtained from a digital filter bank....

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  • ...Then, the generators most coherent with each of generators [1, 2, 5, 7, 10]; [14]; [6, 13, 16] will be determined in the second, third and fourth layers, respectively, using their corresponding DTs....

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  • ...Furthermore, the wavelet phase difference approach [7], subtractive clustering [8], Lyapunov function [9], projection pursuit [10], singular value decomposition [11], prony analysis [12] and, principal component analysis [13] are among the solution techniques applied in the literature....

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References
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Book
31 Dec 1999
TL;DR: In this paper, the authors present a modal analysis of power systems and their properties, including the nature of power system oscillations and stabilizers, as well as their properties.
Abstract: 1. Introduction. 2. The Nature of Power System Oscillations. 3. Modal Analysis of Power Systems. 4. Modal Analysis for Control. 5. Power System Structure and Oscillations. 6. Generator Controls. 7. Power System Stabilizers. 8. Power System Stabilizers - Problems and Solutions. 9. Robust Control. 10. Damping by Electronic Power System Devices. A1. Model Data Formats and Block Diagrams. A2. Equal Eigenvalues. Index.

1,322 citations

Journal ArticleDOI
TL;DR: In this paper, a detailed account of analytical work carried out to determine the parameters of power system stabilizers (PSS) for the Darlington nuclear generating station presently under construction in eastern Ontario is presented.
Abstract: This paper provides a detailed account of analytical work carried out to determine the parameters of power system stabilizers (PSS) for the Darlington nuclear generating station presently under construction in eastern Ontario. The results presented are, however, of general interest and provide a comprehensive analysis of the effects of the different stabilizer parameters on the overall dynamic performance of the power system. They show how stabilizer settings may be selected so as to enhance the steady-state and transient stability of local plant modes as well as inter-area modes in large interconnected systems. In addition, it is shown that the selected parameters result in satisfactory performance during system islanding conditions, when large frequency excursions are experienced. Darlington GS, when completed by 1992, will comprise four 1100 MVA, 0.85 p.f., 1800 RPM turbine generators with "CANDU-PHW" reactors, moderated and cooled by heavy water. The station will be incorporated into the 500 kV network through three double-circuit lines. The units will be equipped with transformer-fed thyristor excitation systems and Delta-P-Omega type PSS [1, 2].

854 citations


"Coherency of generators for inter-a..." refers background in this paper

  • ...These oscillations involve swinging of two or more coherent groups of generators against each other [4]–[6]....

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Journal ArticleDOI
TL;DR: In this article, the authors describe the development and evaluation of a method for identifying the coherency behavior of generators for various power system disturbances and use this information as a basis for forming dynamic equivalents which can be applied in transient stability studies.
Abstract: This paper describes the development and evaluation of a method for identifying the coherency behavior of generators for various power system disturbances. This information is used as a basis for forming dynamic equivalents which can be applied in transient stability studies.

364 citations


"Coherency of generators for inter-a..." refers background in this paper

  • ...So, coherency can be determined by linearizing the system [7], [8]....

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OtherDOI
01 Jan 2013
TL;DR: This reading book is your chosen book to accompany you when in your free time, in your lonely, this kind of book can help you to heal the lonely and get or add the inspirations to be more inoperative.
Abstract: This chapter mainly focuses on nonlinear model reduction process and presents the power system dynamic model reduction as used in the industry. It also focuses on coherency and generator aggregation and model reduction for discussing the basis for the power system model reduction tools used in the power industry. The chapter shows a comparison of the accuracy of the simulated time responses from the methods. It describes linear model reduction methods and the coherency and aggregation tools available in the power system toolbox. The chapter also discusses the concepts supporting the various aspects of power system model reduction. It provides the analytical justification for slow coherency due to the sparse and weak connection between coherent areas. The chapter also provides methods of aggregating coherent generators including the singular perturbation methods to improve on the reduced models.

232 citations


"Coherency of generators for inter-a..." refers background in this paper

  • ...So, coherency can be determined by linearizing the system [7], [8]....

    [...]