Cristhian Becker

Universidad de Santiago de Chile

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Humberto Verdejo

Universidad de Santiago de Chile

Wolfgang Kliemann

Iowa State University

José Delpiano

Clínica Las Condes

Almendra Awerkin

University of Padua

Francisco Rivera Tobar

Universidad de Santiago de Chile

Guillermo Guzmán

Universidade de São Paulo

Fernando García-Muñoz

Universidad de Santiago de Chile

Juan M. Zolezzi

Universidad de Magallanes

Mauricio Olivares

Universidad de Santiago de Chile

Karina A. Barbosa

Universidad de Santiago de Chile

Cooperative Institutions

Universidad de Santiago de Chile

University of Chile

Universidad de Magallanes

Pontificia Universidad Católica de Chile

Universidad Politécnica de Madrid

Austral University of Chile

Catholic University of the Maule

Universidad Nacional de Asunción

Universidad Bernardo O'Higgins

University of Talca

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Trajectory Tracking and Disturbance Rejection Performance Analysis of Classical and Advanced Controllers for a SCORBOT Robot

Robotics (2024)

John Kern Claudio Urrea Humberto Verdejo Rayko Agramonte Cristhian Becker

This work presents the design and assessment of four control schemes for the monitoring and regulation of joint trajectories applied in the dynamic model of a SCORBOT-ER V plus robot, which includes the dynamics of the actuators, and the estimation of the friction forces present within the joints. The two classical control strategies calculated torque and PID, and the two advanced control strategies, fuzzy and predictive, are considered. In the latter case, a gravitational compensation stage is incorporated, as well as the inverse models of the motors and the transmissions of belt movement for each joint. Computational tests are performed by applying an external step-type disturbance to the third joint of the robot. Finally, an evaluation of the results obtained is presented through trajectory curves, joint errors, and the three performance indexes residual mean square, residual standard deviation, and index of agreement.

Inverse dynamics

10.3390/robotics13030048

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Citations (2)

Impact of wind power generation on a large scale power system using stochastic linear stability

Applied Mathematical Modelling (2016)

Humberto Verdejo William Escudero Wolfgang Kliemann Almendra Awerkin Cristhian Becker

10.1016/j.apm.2016.04.020

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Citations (28)

Stability region and radius in electric power systems under sustained random perturbations

International Journal of Electrical Power & Energy Systems (2015)

Humberto Verdejo Wolfgang Kliemann Luis Vargas Cristhian Becker

10.1016/j.ijepes.2015.06.012

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Citations (7)

Implementation of Particle Swarm Optimization (PSO) Algorithm for Tuning of Power System Stabilizers in Multimachine Electric Power Systems

Energies (2020)

Humberto Verdejo Victor Pino Wolfgang Kliemann Cristhian Becker José Delpiano

The application of artificial intelligence-based techniques has covered a wide range of applications related to electric power systems (EPS). Particularly, a metaheuristic technique known as Particle Swarm Optimization (PSO) has been chosen for the tuning of parameters for Power System Stabilizers (PSS) with success for relatively small systems. This article proposes a tuning methodology for PSSs based on the use of PSO that works for systems with ten or even more machines. Our new methodology was implemented using the source language of the commercial simulation software DigSilent PowerFactory. Therefore, it can be translated into current practice directly. Our methodology was applied to different test systems showing the effectiveness and potential of the proposed technique.

10.3390/en13082093

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Citations (51)

Design of a Transverse Flux Permanent Magnet Generator Using a Reluctance Circuit

IEEE Access (2021)

Cristhian Becker Mauricio Valência Ferreira da Luz Jean Vianei Leite

This work presents an analytical methodology to design a permanent magnet transverse flux generator using a reluctance circuit. Unlike other research, it fully indicates the details to design the rotor, stator, and the air gap of the machine, with all its geometry. In the design section, special considerations to determine the outer diameter of the rotor, and the accompanying pole pitch for the U-cores and I-cores are presented. The proposal of an iterative algorithm using a reluctance circuit to calculate the turns of the armature winding and curved trajectories of flux tubes to model the leakage flux that will allow the synchronous inductance calculation also is presented. The proposed methodology allows determining the performance and the lumped parameters of the generator. Furthermore, it provides evidence that with this design it is possible to select the values of standard voltage for electric generators of this topology. The analytical results of the magnetic flux densities, magnetic flux, lumped parameters, electromotive force, terminal voltage, armature current, power factor, and efficiency are compared with 3D finite element method. Analyzing these results, it is possible to verify the good agreement between them.

Magnetic reluctance

Magnetic circuit

Shunt generator

10.1109/access.2021.3119567

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Citations (1)

The Erratic Implementation of Measuring, Monitoring and Control System (MMCS) in Chile: The crisis on smart meters

Energy Reports (2020)

Humberto Verdejo Cristhian Becker

The implementation of the Measuring, Monitoring and Control System (MMCS) in Chile was the key element of the most important regulatory and political crisis which has affected the Chilean electric sector. In the news this period was named as "smart-meters crisis". This crisis was also one of the elements that contributed to the social outburst in October 2019. This paper presents both the technical and regulatory background that explain the failure of a public policy intended to modernize the electric distribution grid. It is described the arguments that promoted the investment of the companies on the MMCS, the antecedents that lead the Government to eliminate the obligations opting for the voluntariness in relation to the change of smart meters during the implementation process and the dilemma generated with regards to the pilot projects developed by some electrical distribution companies. Finally, a solution is proposed for the smart-meter's property dilemma.

Voluntariness

Investment

10.1016/j.egyr.2020.08.005

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Citations (6)

GASOLINE KNOCK TESTING

SAE technical papers on CD-ROM/SAE technical paper series (1935)

Cristhian Becker

10.4271/350066

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Citations (0)

An Analytical Model for Small Signal Stability Analysis in Unbalanced Electrical Power Systems

Applied Sciences (2020)

Humberto Verdejo Pablo Moreira Wolfgang Kliemann Cristhian Becker José Delpiano

This paper presents a general model to carry out a small signal stability analysis in electrical power systems (EPSs) that operate in unbalanced conditions. The classic traditional approach is based on a phase representation where it is supposed that the triphasic electric grid does not suffer any variations during its operation. With the presence of unbalances in transmission lines and loads, it is necessary to develop a general model that allows answering the needs and challenges with which modern electric systems must deal. The present work firstly intends to address the three-phase representation of an EPS, including the controllers. The proposed model is applied to a classical test system, a three machine-nine bus system, considering all the dynamic and algebraic variations associated with angular stability analysis. The proposed approach to small signal stability analysis shows results that differ from the classical analysis. The results are backed up with time domain simulations, and therefore, these results could be used in the calculation of the controllers that operate in unbalanced multimachine systems.

Representation

SIGNAL (programming language)

Transmission system

10.3390/app10248855

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Citations (5)

Tuning of Power System Stabilizers using Multiobjective Optimization NSGA II

IEEE Latin America Transactions (2015)

Humberto Verdejo Diego González José Delpiano Cristhian Becker

This article presents the application of the NSGA II genetic algorithm to the tuning parameters of the power system stabilizer. In order to obtain the adjustment needed, three objective functions were proposed to be minimized. Which depend directly on the localization of the real part of eigenvalues of the system under study. By using the search algorithm, a set of feasible solutions are obtained, and then the best is selected according to the parameter combination which satisfy the rigorous criteria related to the dynamic answer of the system. The methodology is applied to two international tests: three machines - nine bus and ten machines -thirty nine bus.

Stabilizer (aeronautics)

10.1109/tla.2015.7332145

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Citations (12)

GASOLINES--PAST, PRESENT, FUTURE

SAE technical papers on CD-ROM/SAE technical paper series (1944)

Cristhian Becker

10.4271/440122

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Citations (0)