Paul Frutos

University of Illinois at Urbana-Champaign, Electrical and Computer Engineering, Alumnus

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Judith L Green

University of California, Santa Barbara

E. Wayne Ross

University of British Columbia

Roshan Chitrakar

Nepal College of Information Technology

Lev Manovich

Graduate Center of the City University of New York

Hadi Winarto

RMIT International University Vietnam

Suresh Muthusamy

Kongu Engineering College

Viacheslav Kuleshov

Stockholm University

Guilherme Moerbeck

UERJ - Universidade do Estado do Rio de Janeiro / Rio de Janeiro State University

Mayra Zahra

State University of Jakarta

Hossein Ghaffarian

Arak University

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Papers by Paul Frutos

Power-Hardware-in-the-Loop Emulation of the Low-Frequency Oscillation Phenomenon in AC Railway Networks

IEEE Access

Dynamic interactions among the AC railway traction network and power electronics converters feedi... more Dynamic interactions among the AC railway traction network and power electronics converters feeding the trains have been reported to cause low-frequency oscillations (LFO) of the catenary voltage and current. This can result in railway system instability, eventually leading to a power outage and the shutdown of the train traffic. To avoid LFO, control of train power electronic converters must be properly designed and tuned. Experimental verification of control performance regarding the LFO phenomenon in the railway traction network is not easy. Alternatively, the railway traction network can be emulated using a power electronic converter, which would feed the train power converter under test. This paper addresses the design of a network emulator able to reproduce the dynamic behavior of the actual network at low frequencies, including LFO. Three different options will be considered for the network emulator. Their performance will be studied first by means of simulations. Finally, the selected solution will be verified on a downscale test bench.

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Low-Frequency Oscillations Analysis in AC Railway Networks Using Eigenmode Identification

2021 IEEE Energy Conversion Congress and Exposition (ECCE), 2021

Dynamic interactions among AC railway networks and train power converters have been reported to c... more Dynamic interactions among AC railway networks and train power converters have been reported to cause low-frequency oscillations (LFO) and eventually instability phenomena, which can collapse the railway power system. Several system parameters can influence the appearance of LFO, including catenary line length, power consumption, control bandwidths, etc. This paper proposes a methodology for the analysis and understanding of the impact of all these parameters on the LFO. The proposed method combines time-domain simulations with eigenvalue analysis. Eigenvalue migration will be shown to be a powerful tool to understand the risk of instability and to analyse potential remedial actions.

Low Frequency Stability of AC Railway Traction Power Systems: Analysis of the Influence of Traction Unit Parameters

Electronics

Dynamic interactions between AC railway electrification systems and traction unit power converter... more Dynamic interactions between AC railway electrification systems and traction unit power converters can result in low frequency oscillation (LFO) of the contact-line voltage amplitude, which can lead to a power outage of the traction substation and the shutdown of train traffic. Several system parameters can influence the low frequency stability of the railway traction power system, including contact-line length and traction unit parameters such as transformer leakage inductance, DC-link capacitance, control bandwidths and synchronization systems. This paper focuses on the influence of these parameters on the LFO. The methodology is based on a frequency-domain analysis. Nyquist and Bode diagrams are used to determine the stability limit. The validation of the method is performed through the use of time-domain simulations.

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On the Implementation of a 3D Space Vector Modulation Algorithm

2018 IEEE International Autumn Meeting on Power, Electronics and Computing (ROPEC), 2018

This paper reports on the development of an efficient C-script implementation of a 3D Space Vecto... more This paper reports on the development of an efficient C-script implementation of a 3D Space Vector Modulation (3D-SVM) algorithm for a Three Phase Four-Leg Voltage Source Inverter. The duty cycles calculations are performed in the three dimensional stationary frame $\alpha \beta \gamma $. The algorithm takes advantage of the finite-set of space-vectors in order to avoid calculating a matrix inversion. The algorithm is implemented in a C-script and tested by simulation in PLECS.

A Performance Comparison of Stationary Frame Control of Three-Leg and Four-Leg Voltage Source Inverters in Power System Applications

IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society, 2018

This paper presents a control performance comparison by simulation of a three and four-leg voltag... more This paper presents a control performance comparison by simulation of a three and four-leg voltage source inverters for autonomous and grid connected operation under balanced and unbalanced loads; and asymmetrical voltage references. The voltage source inverters are described in the stationary frames αβ and αβ in order to perform the system control action by employing a proportional resonant current compensator. Results are obtained by simulations in PLECS, which demonstrate that the three and four leg converters can achieve similar results under balanced and unbalanced loads. Besides, the four-leg inverter is able to control asymmetrical current and voltage references.

Quad-Active-Bridge as the basic cell of a MMC Based SST for DER and DESS Integration

2019 IEEE 28th International Symposium on Industrial Electronics (ISIE), 2019

In a solid state transformer (SST), one of the most important roles is played by the dc-dc conver... more In a solid state transformer (SST), one of the most important roles is played by the dc-dc converter interfacing the high voltage port and the low voltage port while providing galvanic isolation. This paper proposes a quad-active-bridge (QAB) converter as the basic cell of a Modular Multilevel Converter (MMC) based solid state transformer for the integration of distributed energy resources (DER) and distributed energy storage systems (DESS) into the grid. This study comprises power transfer analysis, modeling and control of the QAB for this application. Furthermore, this paper shows an alternative method based on the star-mesh transformation to built the multiwinding tranformer equivalent circuit, that relates any two ports of the multiple-active-bridge (MAB) converter through a link inductance, which allows to describe power flow. Results are obtained by simulations in PLECS.

Low-Frequency Oscillations Analysis in AC Railway Networks Using Eigenmode Identification

2021 IEEE Energy Conversion Congress and Exposition (ECCE)

Principios Mecanica Cuantica

El presente trabajo resume los postulados fundamentales de la mecánica cuántica.

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Power-Hardware-in-the-Loop Emulation of the Low-Frequency Oscillation Phenomenon in AC Railway Networks

IEEE Access

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Low-Frequency Oscillations Analysis in AC Railway Networks Using Eigenmode Identification

2021 IEEE Energy Conversion Congress and Exposition (ECCE), 2021

Low Frequency Stability of AC Railway Traction Power Systems: Analysis of the Influence of Traction Unit Parameters

Electronics

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On the Implementation of a 3D Space Vector Modulation Algorithm

2018 IEEE International Autumn Meeting on Power, Electronics and Computing (ROPEC), 2018

A Performance Comparison of Stationary Frame Control of Three-Leg and Four-Leg Voltage Source Inverters in Power System Applications

IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society, 2018

Quad-Active-Bridge as the basic cell of a MMC Based SST for DER and DESS Integration

2019 IEEE 28th International Symposium on Industrial Electronics (ISIE), 2019

Low-Frequency Oscillations Analysis in AC Railway Networks Using Eigenmode Identification

2021 IEEE Energy Conversion Congress and Exposition (ECCE)

Principios Mecanica Cuantica

El presente trabajo resume los postulados fundamentales de la mecánica cuántica.

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