Seminario 177 'Application of Fuzzy Decision Making to the Switching State Selection in the Predictive Control of a Direct Matrix Converter', y 'Discrete Nonlinear Control based on a Double dq Transform of a Multi-Cell UPQC' Felipe Villarroel y Jaime Rohten, alumnos de Magíster en Ing. Eléctrica DIE-UdeC, nos presentarán los resultados de sus papers aceptados para ser presentados en la conferencia IEEE IECON 2011 a realizarse en Melbourne, Australia en noviembre próximo. Las charlas se realizarán el viernes 21 de octubre a las 16:00 hrs., y 16:30 hrs., respectivamente, en el laboratorio LCDA. "Application of Fuzzy Decision Making to the Switching State Selection in the Predictive Control of a Direct Matrix Converter"
The finite states model predictive control is a promising alternative in the field of the control of power converters. Its characteristics allow simple and flexible control schemes with fast dynamics. However, the standard formulation of this type of controllers, which is based on an aggregated cost function, requires suitable weighting factors for an adequate switching state selection. The specification of these factors depend on various parameters making it a non trivial process. In this work, an alternative is proposed that replaces the standard aggregated cost function with a fuzzy decision making strategy. This strategy retains the multiple attribute nature of the state selection. As a result, the possibility of a more natural and higher level design approach to the state selection process is opened. To introduce the technique, only objectives with equal importance are considered. Simulation results are presented
to illustrate and validate the approach using the control of output and input currents in the Direct Matrix Converter.
| | Felipe Villarroel, Tesista de Magíster en Ingeniería Eléctrica |
"Discrete Nonlinear Control based on a Double dq Transform of a Multi-Cell UPQC"
A Discrete Nonlinear Control with a double dq Transform of a Multi-Cell Unified Power Quality Conditioner (UPQC) based on Single-Phase Power Cells is presented. The UPQC is a back-to-back connection of active filters; combining a shunt and a series topology but maintaining the features of both units, where the main objective is to improve the power quality. The multivariable, nonlinear and coupled nature of the UPQC makes the control a difficult task. In this work a discrete nonlinear control of a multilevel UPQC based on Single-Phase power cells is proposed, where the controlled variables are decoupled to improve both dynamic and static system responses. In this scheme, two different Park Transforms are used to conveniently synchronize each compensator, in order to allow a dedicated control for every output variable. In this
work it is shown that the DC link voltage of every power cell can be controlled in a wider range as compared to a traditional control strategy, thus improving robustness for several types of loads.
| | Jaime Rohten, Alumno de Magíster en Ingeniería Eléctrica |
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