Browsing by Author "Sempertegui Alvarez, Rodrigo Efrain"

Now showing 1 - 5 of 5

A study of microgrids through cooperative games including the effect of geographical proximity.
(Institute of Electrical and Electronics Engineers Inc, 2017) Sanango Fernandez, Juan Bautista
Given the growing demand for energy and the diversification of its sources, electric utilities have seen the need to incorporate distributed generation in their systems in order to minimize energy losses and raise quality indicators. In this context, it is important to have mathematical tools to assist the management of energy exchange between all players in an electrical system (customers, generators, and "prosumers"). The theory of cooperative games offers tools that are able to model the exchange among coalitions formed by elements of a system. Specifically, we adopt an existing algorithm that simulates the exchange of energy between microgrids as a cooperative game. In order to avoid the consideration of unrealistic coalition formation scenarios, we modify this algorithm by including the effect of geographical proximity. The resulting strategy was implemented in MatLab and was applied to a simple case study. Both the effect of including this restriction on the reduction of losses and the impossibility of forming the so-called grand coalition are analyzed.
Condiciones y segmentos de la transportación en las Galápagos: estado actual de la electromovilidad y oportunidades
(2024) Ochoa Correa, Danny Vinicio
The Galapagos islands, recognized as a biodiversity treasure and a global symbol of conservation, face significant threats primarily due to tourism and fossil fuel-based transportation. The transition to a more sustainable and ecological transportation system becomes essential to preserve this unique ecosystem. This article aims to identify specific niches where initiatives geared towards a new model of efficient and environmentally friendly land and maritime transportation can be effectively implemented. Crucial data for this research were obtained through strategic collaborations with Ecuadorian government entities and on-site information gathering conducted by the research team. The data presented in this article provide a detailed insight into the conditions and segments of transportation on the islands, and it aspires to be a seedbed of opportunities. The goal is to inspire other researchers and transportation professionals, serving as a source of inspiration and reference for developing and implementing specific initiatives in the field of electromobility
Electrical energy conversion system design with single-phase inverter and H5 transformerless topology
(UNIVERSIDAD DE ANTIOQUIA, 2014-01-01) Colina Morles, Eliezer; Sempertegui Alvarez, Rodrigo Efrain; Vanegas Peralta, Pablo Fernando; Gonzalez Morales, Luis Gerardo
This paper presents the design of an electrical energy conversion system (EECS) for the use of solar energy and its conditioning for injection of energy to the commercial power grid. A single-phase full-bridge inverter with transformerless H5 topology coupled to an LCL filter is used. The system is identified using an averaged small-signal state space model; while the used cascade control scheme is tuned by pole placement and includes a maximum power disturb-observe tracking type algorithm of that increases efficiency by operating the system at the optimum operating point of the solar panel. This design describes essential technical aspects in the components sizing and selection for experimental development, as well as the control structure design for a good performance to face systems perturbations.
High performance position control of permanent magnet synchronous drives
(Institute of Electrical and Electronics Engineers Inc., 2018) Sempertegui Alvarez, Rodrigo Efrain; Pesantez, Antonio; Neves, Luis
In the design and test of electric drive control systems, computer simulations provide a useful way to verify the correctness and efficiency of various schemes and control algorithms before the final system is actually constructed, therefore, reducing development time and associated costs. Nevertheless, the transition from the simulation stage to the actual implementation has to be as straightforward as possible. This paper presents the design and implementation of a position control system for permanent magnet synchronous drives using the dsPIC33FJ32MC204 microcontroller as the target processor to implement the control algorithms. The overall system is simulated and tested in Proteus VSM software which is able to simulate the interaction between the firmware running on the microcontroller and the analogue circuits connected to it. The electric drive model is developed using elements present in the Proteus VSM library. As in any high-performance AC electric drive system, field oriented control is applied. The complete control system is distributed in three control loops, namely torque, speed and position. A standard PID control system, and a hybrid control system based on fuzzy logic, are implemented and tested. The natural variation of motor parameters, such as winding resistance and magnetic flux, are also simulated. Comparisons between the two control schemes are carried out for speed and position control using different error measurements, such as, integral square error, integral absolute error and root mean squared error. Comparison results show a superior performance of the fuzzy-logic-based controller when coping with parameter variations, and by reducing torque ripple, but the results are reversed when periodical torque disturbances are present.
Peak control current in boundary conduction mode and discontinuous conduction mode for inverter with flyback topology
(INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS INC., 2015-06-02) Sempertegui Alvarez, Rodrigo Efrain; Vanegas Peralta, Pablo Fernando
This paper proposes a hybrid control scheme peak current, applied to a single-phase micro inverter with flyback topology coupled to a LC filter, the proposed scheme allows the inverter to operate by boundary conduction mode when the output current exceeds a predetermined value. Otherwise, it operates in the discontinuous conduction mode, limiting the switching frequency. To set the control system in both modes of operation, the inverter is identified by averaging the model state and small signal, the control scheme used, presents a classic PI control and is tuned by pole placement. The proposed control scheme is verified through computer simulation.