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Alfonso Conesa-Roca
Polytechnic University of Catalonia
7Publications
4H-index
284Citations
Publications 7
Newest
#1Guillermo Velasco-Quesada (UPC: Polytechnic University of Catalonia)H-Index: 4
#2Manuel Román-Lumbreras (UPC: Polytechnic University of Catalonia)H-Index: 4
Last.Alfonso Conesa-Roca (UPC: Polytechnic University of Catalonia)H-Index: 4
view all 4 authors...
This paper presents a new improvement in the design of a fluxgate-based current transducer in order to reduce the power consumption of control electronics. The proposed improvement involves the replacement of the output linear amplifier of the transducer by a class H amplifier. The output amplifier is devoted to the magnetic flux compensation and generates the transducer output current, which is proportional to the current to be measured. In this way, it is possible to reduce significantly the p...
#1Guillermo Velasco-Quesada (UPC: Polytechnic University of Catalonia)H-Index: 4
#2Manuel Román-Lumbreras (UPC: Polytechnic University of Catalonia)H-Index: 4
Last.Alfonso Conesa-Roca (UPC: Polytechnic University of Catalonia)H-Index: 4
view all 3 authors...
This paper compares two central dimmer system technologies used in street lighting. These dimmers are utilized in adaptive lighting systems based on high-intensity-discharge lamps and magnetic ballasts. The first technology is based on a multiple-tapped autotransformer which is commonly used for these types of installations. The second technology is based on a high-frequency switch converter (more specifically in a single-phase matrix converter topology) and represents a novelty for this type of...
This paper presents a procedure for the characterization of inductors when operate under combination of low-frequency sinusoidal current (50 or 60 Hz) and high frequency current, up to 20 kHz, produced in the PWM process. These currents are typical on inductors installed between the power converter output and the electric grid in photovoltaic generation plants. This procedure allows the determination of the inductance value, the value of series and parallel resistance associated with the inducto...
This paper presents the design and final realization of a transducer system for the measurement of high dc and ac currents. This transducer is based on the magnetic flux compensation technique, also called fluxgate principle. The transducer designed can measure currents of around 1 kA of peak value with a 170-kHz small-signal bandwidth. This functionality can be achieved with low power consumption if the designed system is compared with other fluxgate transducers available on the market and with...
Apr 1, 2010 in MELECON (Mediterranean Electrotechnical Conference)
#1Manuel Román-Lumbreras (UPC: Polytechnic University of Catalonia)H-Index: 4
#2Guillermo Velasco-Quesada (UPC: Polytechnic University of Catalonia)H-Index: 4
Last.Alfonso Conesa-Roca (UPC: Polytechnic University of Catalonia)H-Index: 4
view all 3 authors...
This work presents a three-phase AC-AC converter, with independent phase control, based on matrix-converter structure. This converter is applied to electrical energy saving on the public lighting systems by means of regulation and control of the voltage applied to the lamps. The developed converter represents a technological improvement with respect to the traditional systems based on an autotransformer: it reduces system cost and volume, and increases lamps lifetime.
This paper applies a dynamical electrical array reconfiguration (EAR) strategy on the photovoltaic (PV) generator of a grid-connected PV system based on a plant-oriented configuration, in order to improve its energy production when the operating conditions of the solar panels are different. The EAR strategy is carried out by inserting a controllable switching matrix between the PV generator and the central inverter, which allows the electrical reconnection of the available PV modules. As a resul...
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