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Beltran-Carbajal F.,Metropolitan Autonomous University | Valderrabano-Gonzalez A.,University of Guadalajara | Rosas-Caro J.C.,University of Guadalajara | Favela-Contreras A.,ITESM Campus Monterrey
Electric Power Systems Research | Year: 2015

An output feedback dynamic control scheme is proposed for efficient velocity trajectory tracking tasks for direct current (DC) electric motors. An asymptotic differentiation approach of signals is also introduced and applied for real-time angular acceleration estimation. The novel feature of this differentiator of signals is that it does not require any system mathematical model. Hence the presented differentiation approach admits a wide variety of practical applications in diverse electric power systems that require signal differentiation for their control and identification. The synthesis of the differentiation scheme considers the possible practical scenario of contaminated output signals with reasonably small noise. Some computer simulations results are included to show controller robustness to reject completely unknown chaotic load torque disturbances and parametric uncertainty, as well as effectiveness of the differentiation scheme of signals. © 2015 Elsevier B.V. All rights reserved.

Beltran-Carbajal F.,Metropolitan Autonomous University | Valderrabano-Gonzalez A.,University of Guadalajara | Rosas-Caro J.C.,University of Guadalajara | Favela-Contreras A.,ITESM Campus Monterrey
ISA Transactions | Year: 2015

This paper presents an application of a nonlinear magnetic levitation system to the problem of efficient active control of mass-spring-damper mechanical systems. An output feedback control scheme is proposed for reference position trajectory tracking tasks on the flexible mechanical system. The electromagnetically actuated system is shown to be a differentially flat nonlinear system. An extended state estimation approach is also proposed to obtain estimates of velocity, acceleration and disturbance signals. The differential flatness structural property of the system is then employed for the synthesis of the controller and the signal estimation approach presented in this work. Some experimental and simulation results are included to show the efficient performance of the control approach and the effective estimation of the unknown signals. © 2015 ISA.

Beltran-Carbajal F.,Metropolitan Autonomous University | Valderrabano-Gonzalez A.,Panamerican University of Mexico | Favela-Contreras A.R.,ITESM Campus Monterrey | Rosas-Caro J.C.,Panamerican University of Mexico
Asian Journal of Control | Year: 2015

This paper proposes a novel output feedback control scheme for robust stabilization and tracking tasks in a magnetic suspension system. Active disturbance rejection control, differential flatness and on-line asymptotic disturbance estimation are properly used for the proposed control synthesis. The controlled system is subjected to a wide spectrum of unknown significant matched and unmatched disturbances due to external forces and voltages, parametric uncertainties, control and state-dependent perturbations and possibly input unmodeled dynamics. The effectiveness and robustness of the proposed active disturbance control scheme is verified by computer simulations for the robust tracking of a rest-to-rest reference position trajectory specified to firstly stabilize the suspended mass at a desired vertical position and next transfer it to another equilibrium position for both continuous and switched control voltage signals. © 2014 Chinese Automatic Control Society and Wiley Publishing Asia Pty Ltd.

Velumani S.,Av IPN and 2508 | Guzman C.E.,ITESM Campus Monterrey | Peniche R.,ITESM Campus Monterrey | Vega R.,SEISA
International Journal of Energy Research | Year: 2010

Distributed generation is becoming an attractive option for industrial and commercial scale customers. The main advantage of this on-site power generation is that it offers a more efficient, reliable and cost-effective power supply. In addition, waste heat can be used for local heating or cooling. This is known as cogeneration or combined heat and power (CHP). In the present work, a hybrid-CHP system for a 230kWe demand building is proposed and analyzed. The system considers the coupling of: A Solid Oxide Fuel Cell stack with an output of 200 kWe. A Microturbine with an output of 30 kWe. A single effect Absorption cooling system providing 55 kWt for air conditioning using water chillers. This plant would use natural gas as the primary fuel. The SOFC module is fed with the gas fuel and the whole stack generates the main power while acting as a combustor. The product gases exit the anode at a temperature of 900°C and are directly injected to the Micro Gas Turbine unit to produce additional power. Finally, the waste heat available at the turbine's exhaust fires a single effect Absorption Water-Chiller to provide cooling for air conditioning in the building. This proposed system would generate up to 230 kWe and 55 kWt with high thermal efficiencies of around 70-75%. Currently, Hybrid SOFC/GT and Microturbine/CHP systems are being considered or tested at several facilities. However, a combination of both, which would yield to trigeneration, has not been considered yet. Here we present a conceptual model based on specific proposals and investigations done by other researchers. A theoretical analysis on the proposed model is conducted to evaluate the potential and possibilities of such Hybrid CHP system and further discussions based on the economical considerations is also presented. © 2009 John Wiley & Sons, Ltd.

Carbajal F.B.,Metropolitan Autonomous University | Contreras A.F.,ITESM Campus Monterrey | Gonzalez A.V.,Panamerican University of Mexico | Navarro G.S.,CINVESTAV
Revista Facultad de Ingenieria | Year: 2013

This paper deals with the problem of time-varying desired position reference trajectory tracking tasks for an object in a differentially flat nonlinear magnetic levitation system using position measurements only. A novel scheme for signal differentiation is proposed for asymptotic estimation of velocity and acceleration. This differentiator can be utilized in many control applications of practical engineering systems where the differentiation of any signal is required. The differentiation of signals is combined with a differential - atness-based controller for asymptotic tracking of reference trajectories. Simulation results are provided to show the efficient performance of the proposed differentiator-control scheme. Two issues for reference trajectory tracking tasks are performed. The first one considers the rest-to-rest position transfer problem of the object from a nominal position to another, while the second one focuses on the sinusoidal position trajectory tracking problem.

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