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94 results on '"Malvar, Jano"'

2. Effects of discreditization methods on the performance of resonant controllers

Author

Yepes, Alejandro G., Freijedo, Francisco D., Doval-Gandoy, Jesus, Lopez, Oscar, Malvar, Jano, and Fernandez-Comesana, Pablo

Subjects
Z-transforms -- Usage, Resonance -- Control, Digital control systems -- Research, Digital control systems -- Design and construction, Power conditioning -- Methods, Power converters -- Design and construction, Business, Electronics, Electronics and electrical industries
Published
2010

32. Grid-synchronization methods for power converters

Author

Freijedo, Francisco D., primary, Doval-Gandoy, Jesus, additional, Lopez, Oscar, additional, Martinez-Penalver, Carlos, additional, Yepes, Alejandro G., additional, Fernandez-Comesana, Pablo, additional, Malvar, Jano, additional, Nogueiras, Andres, additional, Marcos, Jorge, additional, and Lago, Alfonso, additional

Published
2009
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35. Evolutive algorithm for power flow optimization

Author

Fernandez-Comesana, Pablo, primary, Doval-Gandoy, Jesus, additional, Freijedo, Francisco D., additional, Lopez, Oscar, additional, Malvar, Jano, additional, Yepes, Alejandro G., additional, Diaz-Dorado, Eloy, additional, and Alvira-Baeza, David, additional

Published
2009
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38. Current Harmonics Compensation Based on Multiresonant Control in Synchronous Frames for Symmetrical $n$-Phase Machines.

Author

Yepes, Alejandro G., Malvar, Jano, Vidal, Ana, Lopez, Oscar, and Doval-Gandoy, Jesus

Subjects
*ELECTRIC current converters, *ELECTRIC power conversion, *ELECTRIC windings, *ELECTRICAL harmonics, *ELECTRIC controllers, *ELECTRIC impedance
Abstract

Low-order odd current harmonics arise in practical multiphase drives due to machine and converter nonlinear behavior (e.g., deadtime and flux saturation). If the windings are distributed, some harmonics cause torque ripple, whereas others produce losses. The latter is aggravated by the small impedance in the no-torque subspaces. Current harmonics can be compensated without steady-state error by proportional–integral controllers in multiple synchronous frames (SFs); however, a heavy computational load is required. In three-phase systems, the computational burden of this multiple SF (MSF) scheme is often avoided by implementing instead resonant controllers (RCs) tuned at the harmonics that are multiples of six in an SF rotating with the fundamental frequency. A similar structure has been proposed for nonlinearities compensation in asymmetrical six-phase machines. This paper extends this multiple RC (MRC) strategy to symmetrical machines of any phase number. The optimum frequencies for the RCs and for the SF in each plane, so that the number of RCs is minimized, are established. Then, the computational load of the resulting generic MRC scheme is assessed and compared with that of the MSF structure. The conditions in which the former is particularly preferable over the latter are identified. Experimental results are provided. [ABSTRACT FROM PUBLISHER]

Published
2015
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39. Assessment and Optimization of the Transient Response of Proportional-Resonant Current Controllers for Distributed Power Generation Systems.

Author

Vidal, Ana, Freijedo, Francisco D., Yepes, Alejandro G., Fernandez-Comesana, Pablo, Malvar, Jano, Lopez, Óscar, and Doval-Gandoy, Jesús

Subjects
DISTRIBUTED power generation, ELECTRIC power, POWER resources, ELECTRIC power production, ELECTRIC current converters, ELECTRIC power supplies to apparatus
Abstract

The increasing number of distributed power generation systems (DPGSs) is changing the traditional organization of the electrical network. An important part of these DPGSs is based on renewable energy sources. In order to guarantee an efficient integration of renewable-based generation units, grid codes must be fulfilled. Their most demanding requirements, such as low-voltage ride-through and grid support, need a really fast transient response of the power electronics devices. In this manner, the current controller speed is a key point. This paper proposes a methodology to assess and optimize the transient response of proportional-resonant current controllers. The proposed methodology is based on the study of the error signal transfer function roots by means of pole–zero plots. Optimal gains are set to achieve fast and nonoscillating transient responses, i.e., to optimize the settling time. It is proved that optimal gain selection results from a tradeoff between transients caused by reference changes and transients caused by changes at the point of common coupling. Experimental results obtained by means of a three-phase voltage source converter prototype validate the approach. Short transient times are achieved even when tests emulate very demanding realistic conditions: a +90^\circ phase-angle jump in the current reference and a “type C” voltage sag at the point of common coupling. [ABSTRACT FROM PUBLISHER]

Published
2013
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