Sergio I. Serna-Garcés

Advances in Power and Energy Systems

Processing electrical energy is one of the most important research fields in our society. So far, tremendous efforts have been made to improve the efficiency of each step in electrical systems: generation systems have been enhanced by introducing renewable energy sources and new control systems for conventional generators, losses have been reduced, the power quality of distribution and transmission systems has been increased, the life-time and state-of-health of energy storage devices have been extended, and sections of the power grid have been isolated for intelligent energy management.

Análisis de la estabilidad de alto orden de un convertidor buck entrelazado basado en el método de Filippov

espanolEl diseno de convertidores conmutados en gran parte de la literatura cientifica esta realizado desde el modelo promediado, debido a la facilidad de obtener las funciones de transferencia lineales. Asimismo, la conmutacion en los convertidores de potencia causa un rizado en las variables de estado que no es considerado en el modelo promediado. El componente de frecuencia de una de las variables de estado esta compuesto por un espectro de potencia con un unico pico de nivel DC (valor promedio), un unico pico a la frecuencia de conmutacion (componente de rizado) y en un numero finito de picos en cada sub-armonico (inestabilidades). El metodo de Filippov es utilizado para la prediccion de inestabilidades debidas a las dinamicas rapidas, este metodo predice el rango de los parametros que evitan la primera bifurcacion en las dinamicas rapidas. En el presente articulo se presenta una prediccion de un espacio de parametros estables para el controlador PI (), estimados por el metodo de Filippov para un convertidor buck de dos fases con regulacion de voltaje. Finalmente, los resultados presentados son validados mediante simulaciones de Matlab y Psim. EnglishIn many papers, the averaged model of power switching converters is used to design the control system due to its simple manipulation, which can be approximated by linear transfer functions. Therefore, the power converter commutation causes a state variable ripple that is not considered on the averaged model. The component frequency of the state variables is composed by a power spectrum with a unique peak at the DC level (average variable), a unique peak at the switching frequency (ripple component) and a finite number of peaks in each sub-harmonic (instabilities). The Filippov method is used for instability predictions due to fast dynamics, this method predicts the parameters range that avoids the first bifurcation of the fast dynamics. In this paper a stable space of parameters (Kp, Ti) for a PI controller is presented, it estimated with the Filippov method, for a buck converter with voltage regulation. Finally, the presented results are validated using both Matlab and Psim simulations.

Modelo matemático de sistemas fotovoltaicos para búsqueda distribuida del punto de máxima potencia

This paper presents a model of photovoltaic generation systems oriented to evaluate the performance of distributed maximum power point tracking algorithms. The model considers the series connection of n module-converter sets, which can be dimensioned depending on the particular application. This model is composed of an equation set that can be implemented in any mathematical analysis software or programming language that allows to solve this kind of equations. The proposed model also includes the static behavior of the photovoltaic module, described by one equation that estimates the current-voltage relation. Additionally, it includes a model of the Boost power electronic converter with inductor lost, which allows an approximation to realistic applications. The final model is validated using simulations, and it is compared with a traditional electronic simulation software implementation.

Ecuación Característica del Predictor de Smith Modificado para Sistemas MIMO

Resumen es: El retardo en sistemas de control es una caracteristica presente con frecuencia en los sistemas reales debido al transporte de objetos o de informacion, ...