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Alternative Energies and Energy Quality (SIFAE), 2012 IEEE International Symposium on

Date 25-26 Oct. 2012

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Displaying Results 1 - 25 of 37
  • [Front cover]

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    Freely Available from IEEE
  • [Copyright notice]

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    Freely Available from IEEE
  • A performance comparison for wind power integration into the grid system

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (426 KB) |  | HTML iconHTML  

    The integration level of wind power into the grid system over the world has been growing at a very fast rate in the last few years and is still keeping this pace. In the future, wind power is expected to be at least comparable to the conventional power generation systems. Large-scale wind farms will need to be integrated into traditional power grid systems, creating the need to establish technical standards to make this integration feasible. This paper covers the performance comparison of a power system with and without the inclusion of a large-scale wind farm. The global system model is presented along to a case of study and the simulation results. View full abstract»

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  • Advanced SVC intelligent control to improve power quality in Microgrids

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    There are certain problems within Microgrids related to the reactive power, due to the installed Distributed Generation (DG) and the non-linear loads. A Microgrid is implemented with PSCAD/EMTDC software and three study cases, or operational modes of the Microgrid, are simulated. Initially a characterization of the power flows through the Microgrid is done, using the P-Q Theory, which facilitates the recognition of the main power issues that have to be compensated in the Microgrid. Then an SVC is implemented, using a control strategy based on fuzzy logic and genetic algorithms, in order to mitigate those power issues identified in the power flow characterization. It is important to take into account that all the simulations (the characterization and the compensation) are made for the three study cases running PSCAD and Matlab simultaneously. View full abstract»

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  • An analysis of Intelligent Demand Management criteria applied in a building case study

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1236 KB) |  | HTML iconHTML  

    The power consumption in buildings represent a 30-40% of the final energy usage, which is caused by: HVAC (Heating, Ventilation and Air Conditioning), lighting and appliances with any connection to the power grid. The major challenge is to minimize the power consumption by optimizing the operation of several loads without impact in the customer's comfort. For this purpose, the design of an Intelligent Demand Management using Intelligent Systems is presented in this paper. Furthermore a comparative analysis is carried out to evaluate the power consumption performance of some Demand Side Management (DSM) techniques. In this case Direct Load Control (DLC), Load Priority (LP) and Scheduled Programming (SP) are compared with the proposed approach based on Artificial Neural Networks (ANNs). Experimental testing is performed with the consumption data base. The testing results show that energy savings can be achieved through control of the states of various loads. View full abstract»

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  • Characterization of power quality disturbances using digital filtering techniques

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    This paper presents a characterization of the solar resource behavior for ten cities of Colombia. This study was made from solar radiation and ambient temperature data collected by the Instituto de Hidrología, Meteorología y Estudios Ambientales de Colombia IDEAM. According to the analyzes, we determined which of these ten cities are the best potential for developing solar energy projects. View full abstract»

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  • Characterization of the solar resource for ten cities in Colombia

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (743 KB) |  | HTML iconHTML  

    This paper presents a characterization of the solar resource behavior for ten cities of Colombia. This study was made from solar radiation and ambient temperature data collected by the Instituto de Hidrología, Meteorología y Estudios Ambientales de Colombia IDEAM. According to the analyzes, we determined which of these ten cities are the best potential for developing solar energy projects. View full abstract»

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  • Compensation of DC-link voltage oscillations in grid-connected PV systems based on high order dc/dc converters

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    The development on PV applications along with recent breakthroughs in power electronics has became in a strong research area especially in modeling and control techniques. This paper presents an analysis of grid-connected photovoltaic systems using three different high-order dc/dc topologies: Cuk converter, SEPIC converter and Zeta converter. This work considers ideal PV systems and a voltage load model is used, which is a common model for large DC-links. A technique for compensation of voltage oscillations is introduced as an alternative to the common use of electrolytic capacitors which introduce reliability problems. The systems are tested through simulation to validate the analysis performed and finally some conclusions about results are given. View full abstract»

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  • Design and implementation of one LEMP simulator for testing an RF-based Lightning Detector integrated to a PQ Monitoring System

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (537 KB) |  | HTML iconHTML  

    This paper presents a proposal for a LEMP simulator circuit for testing an RF-Based Lightning Detector integrated into a PQ Monitoring System to which was added the feature of Auto Correlation of power disturbances with the LEMP spectral components. View full abstract»

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  • Design of a photovoltaic-wind power generation system with grid connection and two micro-grids

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    This paper presents the design of a hybrid photovoltaic-wind power generation system with an installed capacity of 27,6 kW for the Complejo E3T of the Universidad Industrial de Santander. The system consists of five subsystems, four photovoltaic (97,46%) and one wind power (2,54%). The system will generate 40 MWh per year, it will have a predominantly injection of kind grid-tied (95%); but also it will have storage energy from batteries in two micro-grids to ensure supplies to specific loads, both AC or DC (5%). View full abstract»

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  • Development of ecosustainable housing for vulnerable sectors

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    The project consists of the installation of an environmentally sustainable habitation module for a vulnerable sector (In this case “Kyrios”, Rehabilitation Center); the module was built with waste plastic materials from different companies' packaging processes. A photovoltaic system and a solar collector were included as well to meet electricity and thermal energy demands respectively. To guarantee housing conditions, different tests were performed to material, such as Mechanical Resistance, Thermal and acoustic Conductivity. View full abstract»

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  • Development of prototypes and scale models of renewable energy systems in the Instituto Tecnologico de Soledad Atlántico - ITSA

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    On October 3rd of 2001, Congress of the Republic of Colombia made official Law 697 of 2001 which encourages rational and efficient use of energy, promotes the use of alternative energy and other provisions. This initiative of the government has strengthened very significantly the decision of higher education institutions and even secondary schools to advance the training of their students on the topic of renewable energy sources. ITSA has been carrying out projects, developing prototypes, scale models and simulations related to the subject, since its inception as an institution of higher education, mainly solar energy photovoltaic and solar thermal, wave energy systems and innovative initiatives such as utilization system for vehicle flow to generate electricity, or water reuse systems in shopping centers to save energy and water. Taking into account the importance of this research, teachers and students have participated in internal project samples, departmental events and national events, achieving important recognitions. This article is the result of the selection of the most outstanding projects for the past eighteen (18) months of work in the seedbed of the Rational Use of Energy ITSA. View full abstract»

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  • Distributed generation scheme analysis, as an option for Bogota electrical system

    Page(s): 1 - 6
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    This paper outlines the analysis of the concept in the implementation of distributed generation systems focused on the city of Bogotá. Different experiences of adoption of this type of generation, that could be located in various parts of the city, with special emphasis on the economic, environmental, and improved reliability of electricity supply, reported by different authors. Similarly, it also presents a characterization of Colombian electricity sector, through a historical overview of its evolution to its current state, applying the concept of distributed generation. Finally, define benefits and disadvantages of the implementation of distributed generation in Bogota, to be applied to obtain an effective and permanent positioning of these technologies in power schemes in other regions of the country. The conclusion, about the possibility of implementing distributed generation systems under conditions of government stimulus for the development of technologies based on renewable energy generation and cogeneration. View full abstract»

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  • Dynamic modeling and control design for a photovoltaic system for MPPT

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (285 KB) |  | HTML iconHTML  

    Photovoltaic panels have become an important option for supplying electric energy demand, as they transform the energy coming from the sun into electric energy. One of the main goals of this kind of systems is to extract the maximum power from the panel. In this paper it is proposed to use the P&O algorithm working together with a PID controller; the latter is used to find the Maximum Power Point (MPP) and the former's aim is, besides a good tracking of the reference signal generated by P&O algorithm, the rejection of disturbances coming from changes in the environment. As a tool for system analysis and controller design, it is proposed state space modeling for this problem. By means of simulation, the performance of the solution is illustrated the control system enables the operation, at every moment, at the maximum power point, showing robustness to changes in irradiance and variations of battery voltage. View full abstract»

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  • Economic dispatch of renewable power generators in a microgrid

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    The improvement of new energy generation technologies has supported the usage of renewable alternative sources in a distributed way based on an information structure known as a Smart Grid. In this work, we explore the applicability of the distributed generation concept in a small city with renewable energy provided by biomass and small hydro plants in a microgrid configuration. The management of the generators is performed with in an economic dispatch framework with modified metaheuristic optimization algorithms. View full abstract»

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  • Effects of PV interconnection system to a circuit of a distribution network

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    This paper analyzes the effect of the implementation of photovoltaic systems interconnected to a branch circuit of an electricity distribution network in the city of Bogota. By computational simulations NEPLAN tool, connecting the photovoltaic system to the network, the change is evidenced in the direction of power flow, the variation in the levels of voltage, current and power losses, which are then compared with voltage values obtained from Colombian rule governing maximum and minimum levels in the distribution network. Somehow this article contributes to the increase of projects with renewable energy such as developing it demonstrates the improvement that would be implemented in story to operating conditions of the distribution network, improving voltage profiles, complying with the limits established by regulation voltage, and decreasing the amount of current flowing through the conductors, which generates an increase of the useful life thereof. It should be noted that these results are valid under the conditions previously established, and that in a different context can present a different performance. View full abstract»

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  • Environmental Transmission Expansion Planning using non-linear programming and evolutionary techniques

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (223 KB) |  | HTML iconHTML  

    Current energy consumption has led to an increase in the use of fossil fuels to generate electricity, which in turn produces negative impacts on the environment. Studies show that demand will continue growing and new schemes for generating power and managing resources should be developed. In the case of the transmission network, some constraints may lead to use plants with high emission levels, and therefore, appropriate planning is key to minimize environmental impact. This work proposes a methodology for solving the Transmission Expansion Planning Problem (TEPP) when emissions of CO2 are considered. The result is an investment plan that leads to the lowest level of emissions by means of a Chu-Beasley Genetic Algorithm (CBGA). An improvement step is carried in the CBGA in order to minimize also the cost of the plan. Non-linear Interior Point Method (NLIPM) is used to generate the initial population and Linear (LIPM) is used to solve the operative problem in the evolutionary process. The approach is validated using the IEEE-24 bus system in order to show its effectiveness. View full abstract»

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  • Evaluation of incentives for voltage and reactive control using distributed generation in the Colombian electricity system: A system dynamics approach

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    Voltage control and reactive is an ancillary service needed for the reliable operation of power systems. This article discusses the technical advantages of the use of distributed generation (DG) for voltage support and reactive. It also suggests a dynamic model that allows studying incentive policies to increase GD installed in the Colombian power system. View full abstract»

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  • Experimental prototype for endogenous drying wood by radio frequency (RF)

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    This project consolidates around the design and implementation of a prototype for wood drying experimentation; based on a medium power RF circuit coupled to a drying platform it looks for to validate the endogenic heating phenomena by dielectric means. As it was conceived for research purposes, it is rugged enough and it has the proper protected for user safety and technical endurance; due to these considerations, vacuum tubes were used in the design and exposure to RF radiation is time controlled as well, including manual and automatic operation. This opens the gap for future research around energy efficiency, quality and operation of this type dielectric drying vs. conventional drying methods timber. View full abstract»

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  • Gas market vision in Colombia

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    The natural gas sector in Colombia has increased demand, together with a combination of market and energy policy. But the strength of demand begins to show signs of exhaustion, due to the high uncertainty of future supply. Currently, the gas supply cannot meet demand in severe local situations (peak demand as the phenomenon of child) or contingency situations in the transmission or supply. As suggested by the jargon of the electricity sector, gas sector has a problem of adequacy and security. We propose a generalized view of the operational context of the gas market in Colombia, and their interaction with the electricity sector. View full abstract»

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  • Harmonic minimization of a PWM power inverter using bioinspired algorithms

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (453 KB) |  | HTML iconHTML  

    This paper deals with the evaluation of different bio-inspired algorithms techniques that allow reduce harmonic distortion (THD) in pulse width modulation (PWM) of power inverters. It is performed a comprehensive study which identifies and develops biologically inspired optimization algorithms based mainly on tabu search, genetic algorithms, particle swarm optimization and ant colony optimization. Bio-inspired optimization methods are used to find the best operational parameters of a PWM applied to a power inverter. View full abstract»

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  • Illumination benefits using LED high brightness bulb compare to traditional illumination systems

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    In this article, a new kind of led emitter diode is used. The HB-LED (High Brightness Light Emitter Diode), were selected and tested and the results compared with existing light sources used in the Universidad Autónoma de Occidente. Results shows better visual perception of space and great energy savings between 41% and 73% of power consumption compared with actual technology such as high pressure sodium bulbs and energy saving light bulb. The usage of HB-LED reduce the cost of solar systems used as power sources of illumination. View full abstract»

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  • Influential variables in coal batch microwave drying

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    This study evaluates the variables effect of particle size, coal type, operating time and microwave power level during the coal dewatering in a batch microwave process. The batch microwave coal drying was obtained at 300 and 500W of power and was compared with the muffle thermal drying at 80°C. The results show that batch microwave drying is able to remove the 50% of the contain moisture within the coal delaying 10% of the required time by muffle technique. Was found that microwave process do not affect Hard Grove Index, the Calorific Value, and the Ash content coal properties. View full abstract»

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  • Instrumentation and design of a supervisory system for an Anaerobic Biodigestor

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (396 KB) |  | HTML iconHTML  

    This paper presents the design of a supervisory system of an Anaerobic Biodigestor pilot plant located at Universidad de Ibagué in Colombia to produce Biogas. This contribution includes the design of a reliable low-cost instrumentation; whereby, the correct selection, implementation, and calibration of sensors of temperature, pH, CO2, CH4, and gas flow play an important role in accomplishing a good design. The supervisory system is used to perform tasks of fault-detection and on-line measuring; where the last one is essential for modeling by extracting kinetic information of the degradation process and automatic control. Labview® was chosen as the software platform to develop the supervisory system. View full abstract»

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  • Load estimation of power transformers using an artificial neural network

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (247 KB) |  | HTML iconHTML  

    This paper presents a methodology for load estimation of power transformers by means of an artificial neural network. To implement the proposed methodology the data of two power transformers, located in different places and with different operational conditions, were considered. Real data from a data base was provided by utility Interconexión Eléctrica S.A. (ISA). To forecast the load curves a neural network was trained using MATLAB, being able to fit a load curve with daily and weekly prediction times. The proposed method allows the estimation of load curve values in power transformers with an average percentage of relative error around 10%. The method described in this paper can be applied to other equipment with similar operating characteristics. View full abstract»

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