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All Journal International Journal of Electrical and Computer Engineering
Zaid García Sánchez
Universidad de Cienfuegos
Computer Science & IT Electrical & Electronics Engineering

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A mho type phase comparator relay guideline using phase comparison technique for a power system José Antonio González-Cueto; Zaid García Sánchez; Gustavo Crespo Sánchez; Hernan Hernandez; Jorge Iván Silva Ortega; Vicente Leonel Martínez Díaz
International Journal of Electrical and Computer Engineering (IJECE) Vol 11, No 2: April 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v11i2.pp929-944

Abstract

This paper presents a mho distance relay simulation based on the phase comparison technique using a typical electrical power systems analysis software for two cases: when the operation state is close to the static voltage limit and during a dynamic perturbation in the system. The paper evaluates the impedance variations caused by complex voltage values, the mho polarization, and the comparator operating region into the complex plane. In addition, the paper found the information for the dynamic perturbations from the outputs considering a mid-term stability program. The simulation of the mho-phase comparator in the static voltage proximity limit detects unit distance elements with impedance measured close to reach the threshold in the steady-state. Dynamic mho simulations in the complex plane are successfully tested by plotting time phase difference curves on the comparator input signals. Relay programmers can use these curves to analyze other phase comparators applications and the corresponding models in the complex plane.
Frequency response analysis under faults in weak power systems Marino Godoy Arcia; Zaid Garcia Sanchez; Hernan Hernandez Herrera; José Antonio Gonzalez Cueto Cruz; Jorge Iván Silva Ortega; Gustavo Crespo Sánchez
International Journal of Electrical and Computer Engineering (IJECE) Vol 12, No 2: April 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v12i2.pp1077-1088

Abstract

The renewable energy sources (RESs) projects are solutions with environmental benefits that are changing the traditional power system operation and concept. Transient stability analysis has opened new research trends to guarantee a secure operation high penetration. Problems such as frequency fluctuations, decoupling between generator angular speed, network frequency fluctuation and kinetic energy storing absence are the main non-conventional RESs penetration in power systems. This paper analyzes short-circuit influence on frequency response, focusing on weak distribution networks and isolated, to demonstrate relevance in frequency stability. A study case considered a generation outage and a load input to analyze frequency response. The paper compares frequency response during a generation outage with a short-circuit occurrence. In addition, modular value and angle generator terminal voltage affectation by electric arc and network ratio R⁄X, failure type influence in power delivered behavior, considering fault location, arc resistance and load. The arc resistance is defined as an added resistance that appears during failure and influences voltage modulus and angle value results showing that intermittent non-conventional RES participation can lead to frequency fluctuations. Results showed that arc resistance, type of failure, location and loadability determine the influence of frequency response factors in weak power systems.
Co-Authors Gustavo Crespo Sánchez Hernán Hernández Hernan Hernandez Herrera Jorge Iván Silva Ortega José Antonio Gonzalez Cueto Cruz José Antonio González-Cueto Marino Godoy Arcia Vicente Leonel Martínez Díaz