Browsing by Author "Colina Morles, Eliezer"

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Analysis of thermographic patterns using open CV: Case study: A clinker kiln
(SCITEPRESS, 2015-07-21) Morocho Zurita, Carlos Villie; Bautista Llivisaca, Mateo Sebastián; Colina Morles, Eliezer; Falconí Abad, Mara Ximena
The core of the cement production process is the clinker kiln. Proper operation of the kiln depends on factors such as the timely monitoring of its thermal behavior under different operation conditions. This work includes a systematization of empirical knowledge of skilled kiln operators, linking it with the analysis of thermography images of the kiln using Open CV. The paper includes an integration of interventions implemented by the operators, in terms of a log described in natural language. The work highlights potential uses of the knowledge of experienced operators, when this is combined with techniques based on image analysis and artificial intelligence.
Design of a Supervisory Control System for a Clinker Kiln Operation
(INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS INC., 2015-07-14) Colina Morles, Eliezer; Falconí Abad, Mara Ximena; Medina, J; Morocho Zurita, Carlos Villie
The Clinker kiln is the core of the cement production process, which is a heavy infrastructure, where a mixture of limestone and clay undergoes physical and chemical transformations at high temperatures. The process has a very complex non-linear behavior, which hinders its control automatically. This article presents the design of a fuzzy logic-based supervisory system for control tasks upon the Clinker kiln operation [1]. The proposed supervisory system, which has been tested offline in an industrial kiln, uses process variables as the temperature in the burning area, the percentage of oxygen and the back-end temperature, to take appropriate control actions to face operating kiln conditions. The considered control variables in the design are the fuel flow to the burner, the air fan speed and the kiln rotational speed. As a result, the supervisory control system tests showed an improvement in kiln stability and clinker production.
Dynamic systems behaviour analysis and design based on the qualitative theory of differential equations: The Boost power converter case
(TAYLOR AND FRANCIS LTD., 2015-06-03) Colina Morles, Eliezer
This paper uses the qualitative theory of differential equations to analyse/design the dynamic behaviour of control systems. In particular, the Poincaré compactification and the Poincaré - Hopf theorem are used for analysing the local dynamics near the finite and infinite equilibrium points. As an application, a large signal characterisation of a Boost type power converter in closed loop, including its equilibrium/bifurcation points and its global dynamics, which depends upon the value of the load resistance, is studied.
Dynamic systems behaviour analysis and design based on the qualitative theory of differential equations: the Boost power converter case
(2015) Llibre, Jaume; Spinetti-Rivera, Mario; Colina Morles, Eliezer
This paper uses the qualitative theory of differential equations to analyse/design the dynamic behaviour of control systems. In particular, the Poincaré compactification and the Poincaré--Hopf theorem are used for analysing the local dynamics near the finite and infinite equilibrium points. As an application, a large signal characterisation of a Boost type power converter in closed loop, including its equilibrium/bifurcation points and its global dynamics, which depends upon the value of the load resistance, is studied.
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.
Entropy as an event detector in a class of Hybrid Dynamic Systems. study case: A steam boiler
(INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS INC., 2016-10-12) Colina Morles, Eliezer
In a Hybrid Dynamical System (HyDS) event occurrences can be generated by many causes. Also, these events may be controlled or uncontrolled (wanted or un-wanted) which in turn might generate imbalances and/or disorder in the system, with the potential of causing catastrophic faults. In order to be able to deal with controllable events regulation it is important solving an early detection problem, whenever there is no 100% reliable method for detecting them. The main objective of this work is to study and implement an innovative method to detect certain events in a HyDS, such as faults, starts and/or plant shutdowns, setpoint changes, among others. The proposed method is based on the estimation of entropy balance in the system and its efficiency as an event detector is illustrated using Matlab computer simulations on a steam boiler case of study. It is also showed how the entropy balance may be used as an event detector in different operation regions of the process.
Phenomenological modelling and computer simulation of a clinker kiln
(INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS INC., 2016-10-12) Colina Morles, Eliezer; Falconí Abad, Mara Ximena; Medina, J; Morocho Zurita, Carlos Villie
This article uses a two-dimensional phenomenological model representing the dynamic behaviour of a clinker kiln, and includes another model to estimate the height of the solid material (crude) inside the kiln. These models are parameterized according to design specifications and operating conditions of a real industrial kiln, which belongs to a cement production plant. The whole model consists of 16 partial differential equations, one ordinary nonlinear differential equation and a set of algebraic equations, and is computationally simulated using the finite elements method. The model allows analyzing temperature profiles in the kiln, as well as qualitative characteristics associated with fractions of final components in the clinker production.
Understanding chaos through a Jerk circuit
(INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS INC., 2016-06-22) Colina Morles, Eliezer
A simple Jerk circuit that allows studying chaotic dynamics in terms of theoretical variables x, x, x and x, and their equivalent experimental outputs was modeled and implemented. The designed circuit presented a chaotic behaviour depending on the value of a single parameter A -? 1/RA. The variation of A allowed observing the occurrence of a fork trajectory and its evolution into chaos, facilitating to understand the chaotic behaviour in this easily implementable electrical circuit.