Dinámica de convertidores cc-cc en aplicaciones fotovoltaicas

El presente trabajo aborda el estudio de los sistemas de conversión fotovoltaica que emplean convertidores cc-cc conmutados. En particular, se estudia el comportamiento dinámico de los convertidores reductor, elevador y reductor - elevador en aplicaciones fotovoltaicas. Este comportamiento difiere notablemente del obtenido en aplicaciones convencionales de los convertidores. A partir del análisis realizado, quedan en evidencia las propiedades y limitaciones de los convertidores para la regulación de la corriente de carga de batería empleando paneles solares.The paper deals with photovoltaic energy conversion systems, comprising dc-dc switching converters. Particularly, the dynamic behaviour of the buck, boost and buck-boost converters in photovoltaic applications is investigated. This behaviour notoriously differ from the obtained in conventional converters applications. The analysis puts in evidence the features and limitations of the converters as photovoltaic load current regulators.Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES

Dinámica de convertidores cc-cc en aplicaciones fotovoltaicas

El presente trabajo aborda el estudio de los sistemas de conversión fotovoltaica que emplean convertidores cc-cc conmutados. En particular, se estudia el comportamiento dinámico de los convertidores reductor, elevador y reductor - elevador en aplicaciones fotovoltaicas. Este comportamiento difiere notablemente del obtenido en aplicaciones convencionales de los convertidores. A partir del análisis realizado, quedan en evidencia las propiedades y limitaciones de los convertidores para la regulación de la corriente de carga de batería empleando paneles solares.The paper deals with photovoltaic energy conversion systems, comprising dc-dc switching converters. Particularly, the dynamic behaviour of the buck, boost and buck-boost converters in photovoltaic applications is investigated. This behaviour notoriously differ from the obtained in conventional converters applications. The analysis puts in evidence the features and limitations of the converters as photovoltaic load current regulators.Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES

Dinámica de convertidores cc-cc en aplicaciones fotovoltaicas

El presente trabajo aborda el estudio de los sistemas de conversión fotovoltaica que emplean convertidores cc-cc conmutados. En particular, se estudia el comportamiento dinámico de los convertidores reductor, elevador y reductor - elevador en aplicaciones fotovoltaicas. Este comportamiento difiere notablemente del obtenido en aplicaciones convencionales de los convertidores. A partir del análisis realizado, quedan en evidencia las propiedades y limitaciones de los convertidores para la regulación de la corriente de carga de batería empleando paneles solares.The paper deals with photovoltaic energy conversion systems, comprising dc-dc switching converters. Particularly, the dynamic behaviour of the buck, boost and buck-boost converters in photovoltaic applications is investigated. This behaviour notoriously differ from the obtained in conventional converters applications. The analysis puts in evidence the features and limitations of the converters as photovoltaic load current regulators.Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES

Alternativa de control por modo deslizante para seguimiento robusto de la máxima potencia fotovoltaica

En el presente trabajo se propone un método de seguimiento de máxima potencia basado en conceptos de sistemas de estructura variable para sistemas de conversión de energía fotovoltaica. A partir del análisis de las características de las celdas solares operando bajo diferentes radiaciones y temperaturas se propone una caracterización de la región de operación de máxima eficiencia de conversión a través de rectas parametrizadas en la temperatura de los paneles. Esta caracterización permite plantear una estrategia de control que fuerza al convertidor electrónico a operar sobre dichas rectas garantizando el seguimiento del punto de máxima potencia fotovoltaica. El sistema de control diseñado combina la rapidez de seguimiento propia de los diseños basados en modelos y la robustez y simplicidad de los controles por modo deslizante.This paper deals with the design of a maximum power tracker for photovoltaic energy systems using variable structure concepts. Based on the analysis of the P-V curves of the photovoltaic cells, the set of maximum power points defined by different atmospheric conditions of insolation and temperature is described by a family of lines parameterized by the temperature. Then, a new model-based switching control strategy for the electronic converter is proposed. This control strategy forces the converter behavior to emulate a device with operating points on the parametric lines previously obtained. The designed control system combines the attractive properties of model-based ones and the robustness and simplicity of sliding mode control.Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES

Alternativa de control por modo deslizante para seguimiento robusto de la máxima potencia fotovoltaica

En el presente trabajo se propone un método de seguimiento de máxima potencia basado en conceptos de sistemas de estructura variable para sistemas de conversión de energía fotovoltaica. A partir del análisis de las características de las celdas solares operando bajo diferentes radiaciones y temperaturas se propone una caracterización de la región de operación de máxima eficiencia de conversión a través de rectas parametrizadas en la temperatura de los paneles. Esta caracterización permite plantear una estrategia de control que fuerza al convertidor electrónico a operar sobre dichas rectas garantizando el seguimiento del punto de máxima potencia fotovoltaica. El sistema de control diseñado combina la rapidez de seguimiento propia de los diseños basados en modelos y la robustez y simplicidad de los controles por modo deslizante.This paper deals with the design of a maximum power tracker for photovoltaic energy systems using variable structure concepts. Based on the analysis of the P-V curves of the photovoltaic cells, the set of maximum power points defined by different atmospheric conditions of insolation and temperature is described by a family of lines parameterized by the temperature. Then, a new model-based switching control strategy for the electronic converter is proposed. This control strategy forces the converter behavior to emulate a device with operating points on the parametric lines previously obtained. The designed control system combines the attractive properties of model-based ones and the robustness and simplicity of sliding mode control.Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES

Alternativa de control por modo deslizante para seguimiento robusto de la máxima potencia fotovoltaica

En el presente trabajo se propone un método de seguimiento de máxima potencia basado en conceptos de sistemas de estructura variable para sistemas de conversión de energía fotovoltaica. A partir del análisis de las características de las celdas solares operando bajo diferentes radiaciones y temperaturas se propone una caracterización de la región de operación de máxima eficiencia de conversión a través de rectas parametrizadas en la temperatura de los paneles. Esta caracterización permite plantear una estrategia de control que fuerza al convertidor electrónico a operar sobre dichas rectas garantizando el seguimiento del punto de máxima potencia fotovoltaica. El sistema de control diseñado combina la rapidez de seguimiento propia de los diseños basados en modelos y la robustez y simplicidad de los controles por modo deslizante.This paper deals with the design of a maximum power tracker for photovoltaic energy systems using variable structure concepts. Based on the analysis of the P-V curves of the photovoltaic cells, the set of maximum power points defined by different atmospheric conditions of insolation and temperature is described by a family of lines parameterized by the temperature. Then, a new model-based switching control strategy for the electronic converter is proposed. This control strategy forces the converter behavior to emulate a device with operating points on the parametric lines previously obtained. The designed control system combines the attractive properties of model-based ones and the robustness and simplicity of sliding mode control.Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES

Renewable Energy

Renewable Energy is energy generated from natural resources - such as sunlight, wind, rain, tides and geothermal heat - which are naturally replenished. In 2008, about 18% of global final energy consumption came from renewables, with 13% coming from traditional biomass, such as wood burning. Hydroelectricity was the next largest renewable source, providing 3% (15% of global electricity generation), followed by solar hot water/heating, which contributed with 1.3%. Modern technologies, such as geothermal energy, wind power, solar power, and ocean energy together provided some 0.8% of final energy consumption. The book provides a forum for dissemination and exchange of up - to - date scientific information on theoretical, generic and applied areas of knowledge. The topics deal with new devices and circuits for energy systems, photovoltaic and solar thermal, wind energy systems, tidal and wave energy, fuel cell systems, bio energy and geo-energy, sustainable energy resources and systems, energy storage systems, energy market management and economics, off-grid isolated energy systems, energy in transportation systems, energy resources for portable electronics, intelligent energy power transmission, distribution and inter - connectors, energy efficient utilization, environmental issues, energy harvesting, nanotechnology in energy, policy issues on renewable energy, building design, power electronics in energy conversion, new materials for energy resources, and RF and magnetic field energy devices

NASA Tech Briefs, October 2003

Topics covered include: Cryogenic Temperature-Gradient Foam/Substrate Tensile Tester; Flight Test of an Intelligent Flight-Control System; Slat Heater Boxes for Thermal Vacuum Testing; System for Testing Thermal Insulation of Pipes; Electrical-Impedance-Based Ice-Thickness Gauges; Simulation System for Training in Laparoscopic Surgery; Flasher Powered by Photovoltaic Cells and Ultracapacitors; Improved Autoassociative Neural Networks; Toroidal-Core Microinductors Biased by Permanent Magnets; Using Correlated Photons to Suppress Background Noise; Atmospheric-Fade-Tolerant Tracking and Pointing in Wireless Optical Communication; Curved Focal-Plane Arrays Using Back-Illuminated High-Purity Photodetectors; Software for Displaying Data from Planetary Rovers; Software for Refining or Coarsening Computational Grids; Software for Diagnosis of Multiple Coordinated Spacecraft; Software Helps Retrieve Information Relevant to the User; Software for Simulating a Complex Robot; Software for Planning Scientific Activities on Mars; Software for Training in Pre-College Mathematics; Switching and Rectification in Carbon-Nanotube Junctions; Scandia-and-Yttria-Stabilized Zirconia for Thermal Barriers; Environmentally Safer, Less Toxic Fire-Extinguishing Agents; Multiaxial Temperature- and Time-Dependent Failure Model; Cloverleaf Vibratory Microgyroscope with Integrated Post; Single-Vector Calibration of Wind-Tunnel Force Balances; Microgyroscope with Vibrating Post as Rotation Transducer; Continuous Tuning and Calibration of Vibratory Gyroscopes; Compact, Pneumatically Actuated Filter Shuttle; Improved Bearingless Switched-Reluctance Motor; Fluorescent Quantum Dots for Biological Labeling; Growing Three-Dimensional Corneal Tissue in a Bioreactor; Scanning Tunneling Optical Resonance Microscopy; The Micro-Arcsecond Metrology Testbed; Detecting Moving Targets by Use of Soliton Resonances; and Finite-Element Methods for Real-Time Simulation of Surgery

Large space structures and systems in the space station era: A bibliography with indexes (supplement 04)

Bibliographies and abstracts are listed for 1211 reports, articles, and other documents introduced into the NASA scientific and technical information system between 1 Jul. and 30 Dec. 1991. Its purpose is to provide helpful information to the researcher, manager, and designer in technology development and mission design according to system, interactive analysis and design, structural concepts and control systems, electronics, advanced materials, assembly concepts, propulsion, and solar power satellite systems

Advancements in Real-Time Simulation of Power and Energy Systems

Modern power and energy systems are characterized by the wide integration of distributed generation, storage and electric vehicles, adoption of ICT solutions, and interconnection of different energy carriers and consumer engagement, posing new challenges and creating new opportunities. Advanced testing and validation methods are needed to efficiently validate power equipment and controls in the contemporary complex environment and support the transition to a cleaner and sustainable energy system. Real-time hardware-in-the-loop (HIL) simulation has proven to be an effective method for validating and de-risking power system equipment in highly realistic, flexible, and repeatable conditions. Controller hardware-in-the-loop (CHIL) and power hardware-in-the-loop (PHIL) are the two main HIL simulation methods used in industry and academia that contribute to system-level testing enhancement by exploiting the flexibility of digital simulations in testing actual controllers and power equipment. This book addresses recent advances in real-time HIL simulation in several domains (also in new and promising areas), including technique improvements to promote its wider use. It is composed of 14 papers dealing with advances in HIL testing of power electronic converters, power system protection, modeling for real-time digital simulation, co-simulation, geographically distributed HIL, and multiphysics HIL, among other topics