Carlos E Murillo-Sanchez

Carlos E Murillo-Sanchez
National University of Colombia | UNAL · Departamento de Eléctrica, Electrónica y Computación (Manizales)

PhD

About

40
Publications
41,183
Reads
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6,625
Citations
Additional affiliations
February 2009 - present
National University of Colombia
Position
  • Professor (Associate)
Education
August 1995 - December 1999
Cornell University
Field of study
  • Electrical Engineering
August 1989 - December 1991
University of Wisconsin–Madison
Field of study
  • Electrical Enineering
August 1983 - December 1987
Tecnológico de Monterrey
Field of study
  • Electronics

Publications

Publications (40)
Article
As the penetration of renewable energy sources increases, their variability and uncertainty have pushed the development of secure stochastic approaches to solving the secure day-ahead and intra-day multi-period optimal power flow. Some of these approaches, in addition to settling the energy market, also procure other products that generators can of...
Article
Short-term power system operational planning problems that consider multi-stage uncertainties pose significant challenges, not only in the design of tractable optimization frameworks for implementing them, but also in the testing and benchmarking of such frameworks. This paper presents an implementation using the open-source M atpower Optimal Sche...
Technical Report
Objetivo 1: Desarrollar un modelo de simulación del sistema de gas natural de Colombia a nivel de la red regulada, que permita incluir diferentes escenarios de funcionamiento, incluyendo fallos inherentes al sistema y/o fallos por adversidades fenomenológicas, con el fin de optimizar los costos de operación de acuerdo a las distintas necesidades de...
Technical Report
Comprender la complementariedad entre fuentes energéticas debe ser una acción prioritaria antes de planificar y tomar decisiones en el sector energético. En el subsector eléctrico en particular, los sistemas de potencia han estado cambiando por la escasez de fuentes energéticas propias, particularmente, por el agotamiento de recursos fósiles barato...
Conference Paper
This paper presents a model aimed at evaluating the effects of integrating Renewable Energy Sources (RES) in the electricity system, from the perspective of a system operator, taking into account the cost of Carbon Dioxide (C0 2 ) emissions. The model is especially suited to analyze the interactions of energy storage systems (ESS) with conventional...
Article
We present a new formulation of a hybrid stochastic-robust optimization and use it to calculate a look-ahead, security-constrained optimal power flow. It is designed to reduce carbon dioxide ( {\rm CO}_{2} ) emissions by efficiently accommodating renewable energy sources and by realistically evaluating system changes that could reduce emissions. It...
Article
Full-text available
This work presents a stochastic optimization framework for operations and planning of an electricity network as managed by an Independent System Operator. The objective is to maximize the total expected net benefits over the planning horizon, incorporating the costs and benefits of electricity consumption, generation, ancillary services, load-shedd...
Conference Paper
Full-text available
The objective of this paper is to contrast the effect of demand side versus supply side policies aimed at operating a secured system, while maintaining the sustainability of the system by analyzing: 1) the role that load following costs can have in counteracting the impact of unpredictable Renewable Energy Sources (RES) on system operation and 2) T...
Article
Full-text available
MATPOWER is an open-source Matlab-based power system simulation package that provides a high-level set of power flow, optimal power flow (OPF), and other tools targeted toward researchers, educators, and students. The OPF architecture is designed to be extensible, making it easy to add user-defined variables, costs, and constraints to the standard...
Conference Paper
Full-text available
This paper describes the optimal power flow (OPF) architecture implemented in MATPOWER, an open-source Matlab power system simulation package. It utilizes an extensible architecture that allows the user to easily add new variables, constraints and costs to the standard OPF problem formulation while preserving the structure needed to use pre-compile...
Conference Paper
Full-text available
Predictive control can be applied to plants with certain classes of non-convex controls using hybrid system formulations, but the complexity of the resulting receding-horizon integer programs is geometrical in the number of inputs and horizon length. In this paper, a solution algorithm is proposed for this problem, restricted to a class of non-conv...
Conference Paper
Security constrained optimal power flow programs are important tools for ensuring correct dispatch of supply while respecting the many constraints imposed by the delivery system. In addition to getting the dispatch right, locational prices must be calculated with equal precision in order to infuse market participants with the proper incentives for...
Article
Full-text available
The deregulated electricity market calls for robust optimal power flow (OPF) tools that can provide a) deterministic convergence; b) accurate computation of nodal prices; c) support of both smooth and nonsmooth costing of a variety of resources and services, such as real energy, reactive energy, voltages support, etc.; d) full active and reactive p...
Article
Full-text available
En Colombia, el cálculo del despacho de generación es realizado en cuatro etapas. En cada una de ellas se adicionan restricciones de seguridad y confiabilidad. Una de las características más importantes del cálculo del despacho es la inclusión de una política de igualación de riesgos. El despacho debe ser tal que los racionamientos relativos espera...
Conference Paper
Full-text available
This paper presents a new methodology to solve the dispatch problem in the Colombian electricity market. The proposed methodology is based on the use of coupled post-contingency optimal power flows with additional linear constraints to include reliability criteria. The main contribution of this paper is the solution of the Colombian dispatch proble...
Conference Paper
Full-text available
One of the most important sources of atmospheric pollution arises from incomplete or suboptimal combustion of the fuel-air mix in internal combustion engines with traditional contact points ignition. This paper presents three electronic ignition designs for gasoline engines intended to reduce noxious gas emissions and improve the efficiency of the...
Conference Paper
Full-text available
En este trabajo se comparan distintas técnicas de control lineal multivariable aplicadas a un sistema de tanques acoplados, usando criterios de desempeño dinámico, robustez y suavidad de actuación. Las técnicas incluyen los métodos LQR (Regulador Lineal con Costo Cuadrático), LQG/LTR (Regulador Lineal Cuadrático Gaussiano con Recuperación de Transf...
Conference Paper
Full-text available
Se desarrolla un método de estimación de la temperatura del devanado de un transformador de potencia cuando sólo las mediciones de la temperatura del aceite dieléctrico, la del ambiente y de la corriente del primario están disponibles con el propósito de estructurar una estrategia para el encendido y apagado del sistema de enfriamiento. El método h...
Chapter
This chapter presents a formulation of the thermal unit commitment problem that includes nonlinear power flow constraints, thus allowing a more accurate representation of the network than is possible with DC flow models. This also permits potential VAr production to be used as a criterion for commitment of otherwise expensive generators in strategi...
Conference Paper
Electric power is often regarded as a homogeneous commodity due to the ubiquity of the transmission grid. This paper, however, presents a collection of cases in which the physical laws governing network flows can have anomalous and unexpected market implications. For example, reactive power requirements can affect optimal unit commitment and impact...
Conference Paper
Full-text available
The high average prices and high volatility of prices in many restructured markets for electricity have raised concerns about the abuse of market power by generators. At the same time, information about the true costs of generation, that was readily available under regulation, is no longer disclosed by generators. Hence, it is becoming impractical...
Article
Full-text available
Los altos precios y volatilidad recientemente observados en muchos mercados libres de energía eléctrica hacen suponer la existencia de abuso de poder de mercado. Simultáneamente, la información sobre costos verdaderos de producción, de carácter propietario, ya no es revelada, lo cual hace imposible el diagnóstico de abuso de poder de mercado median...
Conference Paper
The authors describe a parallel implementation of the Lagrangian Relaxation Algorithm with variable duplication for the thermal unit commitment problem. The formulation was previously reported by the authors and allows inclusion of the full nonlinear AC network power flow model, which permits addressing voltage limits, as well as more realistic bra...
Article
This paper describes the architecture and uses of an Internet-based software platform called PowerWeb. PowerWeb was designed and implemented as a simulation environment for evaluating various power exchange auction markets through experimental investigation. It is designed to host simulations of a competitive `day-ahead' electric energy market in w...
Article
We describe a formulation of the thermal unit commitment problem that includes AC network constraints, which allows taking into account VAr production as a criterion for generator commitment for the first time. The formulation makes it possible to use the Lagrangian Relaxation technique as a solution algorithm even though the network constraints ar...
Thesis
For over twenty years, Lagrangian relaxation has been the algorithm of choice for solving the unit commitment problem in the electric power industry. This is because it is the only algorithm that exploits the problem structure and results in separation with price coordination when the dual problem is posed. The advantage is that the computational c...
Conference Paper
A formulation of the thermal unit commitment problem including nonlinear power flow constraints is presented, making the use of more realistic constraint models possible. It also allows potential VAr production to be used as a criterion for the commitment of generators in strategic locations of the network. The Lagrangian Relaxation framework and a...
Conference Paper
Full-text available
The objective of the paper is to present experimental results for testing the performance of different auction mechanisms related to the introduction of competitive markets for the generation of electricity. The research is based on the concept of smart markets introduced by Vernon Smith (K.A. McCabe et al., 1991) and a simulation model (PowerWeb)...
Conference Paper
The authors propose a new algorithm for unit commitment that employs a Lagrange relaxation technique with a new augmentation of the Lagrangian. The new augmentation involves a duplication of variables that allows relaxation of the coupling between generator time-spanning constraints and system-wide instantaneous constraints. This framework allows t...
Conference Paper
The paper describes the uses and architecture of a network-centered computing-rich software platform called PowerWeb. PowerWeb was designed and built as a simulation environment for experimentally testing various power exchange auction markets through tournaments. It is designed to host simulations of a competitive “day-ahead” electric energy marke...
Article
An analysis of the stability of a spark ignition engine is carried out to demonstrate the applicability of some new tools for robustness analysis. First, a brief introduction to the model of the engine at idle speed is provided. Then, frequency domain characterizations of both the engine and the controller are seen to depend on a set of uncertain p...
Article
Full-text available
The objective of this paper is to present experimental results for testing the performance of different auction mechanisms related to the introduction of competitive markets for the generation of electricity. The research is based on the concept of smart markets introduced by Vernon Smith and a simulation model (PowerWeb) of a realistic bulk power...
Article
Full-text available
The smart grid has the potential to improve operations on the electric grid and increase economic efficiency in terms of reducing costs for customers, improving the reliability of the supply system and addressing environmental problems such as climate change and urban air pollution. To achieve this, however, customers must be more involved in the w...
Article
Full-text available
States in the U.S. and developed nations around the world have established mandates on what the amounts of socially desirable renewable generation should be. With further adoption of zero marginal cost resources, the payments for energy ($/MWh) are being reduced for conven-tional generation, which then needs to be compensated in a capacity market (...

Projects

Projects (5)
Project
Comprender la complementariedad entre fuentes energéticas debe ser una acción prioritaria antes de planificar y tomar decisiones en el sector energético. En el subsector eléctrico en particular, los sistemas de potencia han estado cambiando por la escasez de fuentes energéticas propias, particularmente, por el agotamiento de recursos fósiles baratos, o mirándolo de otro modo, por el incremento de los costos de explotación para extraer combustibles no convencionales, por las variaciones del clima que afectan las reservas hidrológicas durante periodos de sequía y por la variabilidad de los precios de los hidrocarburos que desestabilizan la economía. Estas situaciones han incentivado el uso de fuentes propias como la energía solar, la energía eólica y la hidroenergía a pequeña escala. No obstante, dichas fuentes se caracterizan por ser intermitentes y su inclusión en los sistemas de potencia introduce niveles de incertidumbre tanto en la operación como en el funcionamiento de los mercados. La importancia del estudio de complementariedad yace concretamente en el carácter intermitente de tales fuentes y busca ofrecer soluciones en los diferentes ámbitos de aplicación. Teniendo en cuenta el planteamiento anterior, el objetivo de la propuesta consiste en presentar un modelo que permita evaluar la complementariedad entre la radiación solar, la precipitación y la velocidad del viento en dos regiones de Colombia, la región Caribe y la región Andina. El principal aporte del proyecto será la elaboración de un modelo de complementariedad de tres fuentes de energía que oriente las decisiones de las instituciones públicas.