GORDILLO ÁLVAREZ , Francisco

El comportamiento dinámico de los sistemas no lineales es mucho más rico que el de los lineales y su análisis mucho más complicado. Para el análisis de estabilidad, las técnicas basadas en la teoría de Liapunov tienen un lugar destacado. En este artículo se revisa parte de esta teoría incluyendo las técnicas de estimación de la cuenca de...

This paper presents a simple method for modulation in multilevel converters, which is hardly affected with the number of levels. The method is based on a simple graph, whose x-axis is directly related to the extra degree of freedom associated with component γ (in the αβγ reference frame) of the desired reference vector. In the y-axis, the...

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This paper presents a novel approach to deal with the regulation of the dc-link capacitor voltages and ac-side currents in a grid-connected five-level diode-clamped converter. Due to the controllability problems of this topology, guaranteeing a solid current control and, mainly, a correct dc-link voltage sharing, represents a complex technical...

The balancing of the dc-link capacitor voltages represents the main technical challenge in multilevel diode-clamped converters. In particular, when the number of capacitors is greater than two, these power conversion systems must be actively controlled to achieve a correct voltage sharing. Focusing on the five-level diode-clamped converter...

This paper compares two recently published modulation and control approaches for a grid-connected five-level diode-clamped rectifier in terms of conduction losses. In this way, a prior analysis of the conducting time at steady state is presented for both approaches, and the usage of the most stressed switching device is calculated. The usage...

This paper presents a simple modulation algorithm which accomplishes the voltage balance across the capacitors of a Cascaded H-bridge (CHB) converter using zero voltage injection. CHB converters are widely used in renewable energy production, especially in solar plants due to their modularity. This advantage can also become a problem when the...

This paper presents an approach to control a grid-connected, five-level, diode-clamped converter (DCC) with solar arrays directly connected to each capacitor of the dc-link, On one hand, the control of such converters is challenging as the voltage imbalance among the capacitor may affect the power controller. On the other hand, when dealing...

This paper presents a complete solution to the problem of swinging-up and stabilization of the inverted pendulum on a cart, with a single control law. The resulting law has two parts: first, an energy-shaping law is able to swing and maintain the pendulum up. Then, the second part introduces additional control to stop the cart and it is based...

En este artículo se presenta una revisión de algunos métodos de diseño y análisis de sistemas de control no lineales, empleando el péndulo invertido como sistema de referencia. En este ingenio se conjugan una sencilla estructura muy fácil de modelar matemáticamente, con una notable complejidad a la hora de diseñar su control. Además constituye...

This paper describes a LQG/LTR controller for a solar distributed collector field. When designing a LQG controller it is easy to take into account the trade-off between quick response and avoiding oscillations which is typical of many control problems. The improved robustness reached with the loop transfer recovery LTR allows for good behaviour...

This paper presents an approach for dealing with the control of five-level, diode-clamped rectifiers. The control of such converters is challenging since the voltage balancing among capacitors is not a trivial task. Some of the existing approaches that cope with this problem use specific modifications of one of the traditional modulation...

The problem of data-driven control is addressed here in the context of switched affine systems. This class of nonlinear systems is of particular importance when controlling many types of applications in electronic, biology, medicine and so forth. Still in the view of practical applications, providing an accurate model for this class of systems...