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15 results on '"Barocio, Emilio"'

2. Robust Three-Stage Dynamic Mode Decomposition for Analysis of Power System Oscillations

Author

Rodriguez-Soto, Ramon Daniel, Barocio, Emilio, Gonzalez-Longatt, Francisco, Segundo Sevilla, Felix Rafael, and Korba, Petr

Abstract

A spatio-temporal method based on Robust Three-stage Dynamic Mode Decomposition (RTDMD) is proposed to improve the modal parameter estimation of synchrophasor data in the presence of noise, missing data and outliers. The proposed method is based on the PMU correlated spatio-temporal data to estimate missing information using an iterative singular value decomposition (SVD) combined with the adjustment of the reduced Koopman operator. Moreover, it is proposed to identify and correct outliers using an inherent statistical extension of the SVD-based Mahalanobis distance. As a result of the proposed enhancements, modal parameters such as damping and power system oscillation frequency are extracted as a byproduct of the RTDMD algorithm process. Data resulting from real-time digital simulators (RTDS) with self-clearing three-phase fault and Phasor Measurement Units (PMUs) of Low-Frequency Oscillation (LFO) incidents at hydroelectric power plants are used to illustrate the effectiveness of the proposed method over other well-established methods.

Published
2024
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6. Power system coherency recognition and islanding: Practical limits and future perspectives

Author

Chamorro, Harold R., Gomez-Diaz, Edgar O., Paternina, Mario R.A., Andrade, Manuel A., Barocio, Emilio, Rueda, José L., Gonzalez-Longatt, Francisco, and Sood, Vijay K.

Abstract

Electrical power systems are continuously upgrading into networks with a higher degree of automation capable of identifying and reacting to different events that may trigger undesirable situations. In power systems with decreasing inertia and damping levels, poorly damped oscillations with sustained or growing amplitudes following a disturbance may eventually lead to instability and provoke a major event such as a blackout. Additionally, with the increasing and considerable share of renewable power generation, unprecedented operational challenges shall be considered when proposing protection schemes against unstable electro-mechanical (e.g. ringdown) oscillations. In an emergency situation, islanding operations enable splitting a power network into separate smaller networks to prevent a total blackout. Due to such changes, identifying the underlying types of oscillatory coherency and the islanding protocols are necessary for a continuously updating process to be incorporated into the existing power system monitoring and control tasks. This paper examines the existing evaluation methods and the islanding protocols as well as proposes an updated operational guideline based on the latest data-analytic technologies.

Published
2022

8. Perturbations of weakly resonant power system electromechanical modes

Author

Dobson, Ian and Barocio, Emilio

Subjects
Electric power systems -- Research, Business, Electronics, Electronics and electrical industries
Abstract

It is not uncommon for oscillatory electric power system modes to move close to a resonance in which eigenvalues coincide. In a weak resonance, the modes are decoupled and the eigenvalues do not interact. We analyze general perturbations of a weak resonance and find two distinct behaviors, including interactions near strong resonances in which the eigenvalues quickly change direction. The possible perturbations are illustrated with interactions between electromechanical modes in a 4-generator power system. Some of the interactions are similar to subsynchronous resonance and can lead to oscillatory instability. Index Terms--Eigenvalues and eigenfunctions, Hopf bifurcation, oscillations, power system dynamic stability, resonance, root loci, snbsynchronous resonance.

Published
2005

9. Scaling of normal form analysis coefficients under coordinate change

Author

Dobson, Ian and Barocio, Emilio

Subjects
Electric power production -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Power system normal form analysis has developed coefficients and indices in modal coordinates to quantify nonlinear modal interactions. We study the changes in the coefficients and indices when the power system equations are expressed in different coordinates or units and show that they can be normalized to be invariant to coordinate changes and thus intrinsic to the power system. The results are illustrated on a 4-generator system. An example shows that the coefficients and indices not only detect nonlinear interactions but also can become very large near a strong resonance in the system linearization. Index Terms--Nonlinear modal behavior, normal form method, power system dynamics, strong resonance.

Published
2004

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