J.L. Mora
University of Seville
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Featured researches published by J.L. Mora.
conference of the industrial electronics society | 1999
Manuel A. Perales; J. Perez; Federico Barrero; J.L. Mora; E. Galvan; J.M. Carrasco; L.G. Franquelo; D. de la Cruz; L. Fernandez; A.L. Zazo
In this paper a system to evaluate a variable speed and pitch angle wind turbine by fuzzy logic techniques is described. A fuzzy logic control has been proposed based on the wind speed estimation in order to get maximum power and stability of the system. An 11 kW prototype system using two inverters connected by a DC-link capacitor has been used: the first one works as a controlled rectifier implementing vector control and the second one handles the power injected into the utility grid. Experimental result of an 11 kW generator are shown.
Microprocessors and Microsystems | 2005
M. A. Aguirre; J. Tombs; V. Baena-Lecuyer; J.L. Mora; J.M. Carrasco; A. Torralba; L.G. Franquelo
Abstract Modern trends in technology require efficient control and processing platforms based on connected software-hardware subsystems. Due to their complexity and size, algorithms implemented on these platforms are difficult to test and verify. When these types of solution are being designed, it is necessary to provide information of the internal values of registers and memories of both the software and hardware during the execution of the complete system. The final architecture of the targeted design and its debugging capabilities strongly depends on how the hybrid system is connected and clocked. This article discusses different architectural strategies that have been adopted for a hybrid hardware-software platform, built ready for debugging, and that uses components that can be easily found with a few special features. All the solutions have been implemented and evaluated using the UNSHADES-2 framework.
power electronics specialists conference | 2001
Manuel A. Perales; J.L. Mora; J.M. Carrasco; L.G. Franquelo
A new, improved, method for calculating the reference of an active filter is presented. This method lays on a new filter, developed by the authors, which is able to extract the main component of a vector signal. Simulation and experimental results confirms the validity of the proposed algorithm.
international symposium on industrial electronics | 2004
Manuel A. Perales; M.M. Prats; Ramon Portillo; J.L. Mora; L.G. Franquelo
Thanks to the use of natural coordinates (abc coordinates), the proposed modulation algorithm is much simpler and intuitive than using /spl alpha//spl beta//spl gamma/ representation, reducing the complexity of modulation algorithm and the computational load associated to it. The application chosen, the 4-wire 4-leg inverter, is employed only as an example of how easy the modulation results using this notation instead of classical /spl alpha//spl beta//spl gamma/ representation.
conference of the industrial electronics society | 2004
L.G. Franquelo; Ma.A.M. Prats; Ramon Portillo; Jose I. Leon; Manuel A. Perales; J.M. Carrasco; E. Galvan; J.L. Mora
In this paper, a novel three-dimensional space vector algorithm for four-legs multilevel converters is presented. It can be applied to active power filters or neutral current compensator applications for compensating harmonics and zero sequence using natural coordinates. This technique greatly simplifies the selection of the 3-D space where a given voltage vector is supposed to be found. The algorithm drastically reduces the algorithm complexity and the calculations of the active vectors with the corresponding switching time which generate the reference voltage vector. In addition, the low computational cost of the proposed algorithm is always the same and it is independent of the number of levels of the converter.
power electronics specialists conference | 2001
J.L. Mora; A. Torralba; L.G. Franquelo
In order to estimate the rotor flux and speed in an induction motor, the extended Kalman filter must be used rather than the linear one. The main drawback of the extended Kalman filter is the great number of arithmetic operations required. This paper presents a linear Kalman filter for rotor flux with adaptive speed estimation that reduces the number of operations by a factor of 8.5 compared with the straightforward implementation of the extended Kalman filter.
IEEE Transactions on Circuits and Systems Ii-express Briefs | 2009
F. Colodro; A. Torralba; J.L. Mora; Juana M. Martínez-Heredia
Accurate analog squarers are required for different signal processing functions, such as amplitude modulation, frequency shifting, signal power estimation, and neural and image processing. Transistor-level analog squarers suffer from limited accuracy, particularly in modern deep-submicrometer technology, where the squared law of the MOS transistor in the saturation region is no longer valid. Based on the asynchronous sigma-delta modulator (ASDM), a new circuit that provides the squared value of the input signal is proposed. For slowly varying input signals, the filtered output is a replica of the squared input signal. In this brief, the proposed analog squarer is studied, and the analytical results are validated by simulation in the time domain. The effect of analog imperfections on the accuracy of the squarer is also analyzed by showing that a high signal-to-noise-plus-distortion ratio can be obtained for typical values of the mismatch and up to frequencies near half the maximum frequency of the ASDM limit cycle.
international conference on electronics circuits and systems | 1998
J.L. Mora; E. Galvan; F. Colodro; Federico Barrero; J. Tombs; M. Barranco; A. Torralba; L.G. Franquelo
This paper presents ASITRON, an integrated solution to the vector control of induction motors. ASITRON is a microsystem that integrates in a chip all the logic required to implement the indirect vector control method, the current loop control and external interface. A built-in 64-rule fuzzy logic controller deals with the speed or position outer control loop. This ASIC is now part of a compact, high performance industrial control system for elevators.
power electronics specialists conference | 2002
Manuel A. Perales; J.L. Mora; L. Terron; J.M. Carrasco; L.G. Franquelo
A new method for calculating the reference of an active filter was presented by the authors in previous papers. This method has demonstrated very good performance on distorted and unbalanced conditions, although no transient analysis had been made. In this paper, the method is analyzed in transient conditions, showing very good response in load changes and frequency perturbations. The influence of variation of the filter constant, k/sub f/ is studied, by means of simulation and experimentation, in order to determine the influence of this parameter. For this purposes a performance index is defined and measured in different conditions to deduce the dependence of the transient response with respect to the constant k/sub f/. Extensive simulations and experimentations have been made showing a very interesting, and somehow unpredicted result. Also, the ability of adapting the fundamental frequency is tested, and studied its dependence with k/sub f/ and with the constant KI associated to the frequency control loop. This was another property enounced in previous works but never tested before, and the results are really good, both in simulation and experimental cases, confirming that is a self-tuned filter. Some design criteria are exposed in order to facilitate the implementation of an active power filter based on this kind of structure.
conference of the industrial electronics society | 1999
J.L. Mora; J. Tombs; R. Pachon; A. Torralba; M. Barranco; L.G. Franquelo
A classical method for angular position and speed estimation in adjustable speed drives uses an incremental shaft encoder and an electronic circuit. This paper presents SLESS, a tachometer without a mechanical transducer implemented on an ASIC using sensorless speed estimation techniques. The ASIC is intended to serve as part of an integrated solution developed for fuzzy speed regulation and vector control of induction motors.