1,720,983 research outputs found
On Speed and Rotor Position Estimation in Permanent-Magnet AC Drives
Full text linkThis letter deals with rotor position and speed estimation of permanent magnet ac drives. Two reduced-order observers, a linear (AO) and a nonlinear one (NLO), are compared. An adaptive speed estimation scheme is also considered. Analysis and simulations show that the NLO has better performance and demands less computational load than the AO plus the adaptive scheme.Fil: Solsona, Jorge Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ingeniería; ArgentinaFil: Muravchik, Carlos Horacio. Universidad Nacional de La Plata. Facultad de Ingeniería. Departamento de Electrotecnia. Laboratorio de Electrónica Industrial, Control e Instrumentación; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas; ArgentinaFil: Valla, Maria Ines. Universidad Nacional de La Plata. Facultad de Ingeniería. Departamento de Electrotecnia. Laboratorio de Electrónica Industrial, Control e Instrumentación; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentin
Induction Motor Driven by a CAMC Using Predictive Control
Full text linkThis work presents a control strategy for an induction motor fed by a Cascade Asymmetric Multilevel Converter (CAMC). The approach is based on the Finite-States Model Predictive Control technique and uses the dynamic motor model and the converter model to pre-calculate the evolution of the variables of interest. These target variables are jointly compared with their reference values by means of an optimization function which allows to determine the best state among all switching combinations. This selection is carried out in a direct way, in each sampling period without modulator.Fil: Verne, Santiago Andres. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata; ArgentinaFil: Gonzalez, Sergio Alberto. Universidad Nacional de La Plata; ArgentinaFil: Valla, Maria Ines. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata; Argentin
A WTS Power Conversion Stage With Multilevel Converters Operating in the Medium Voltage Range
Full text linkA high power medium voltage converter for wind turbine system is presented in this paper. The proposal mitigates classic design tradeoffs around low voltage, high current link between the generator and the utility grid on the megawatt range. The power converter is based on Multilevel Converters technology which allows to extend the power-handling capability of the electronic switches, reaching the medium voltage operation without step-up transformers. The converter controllers are based on the Finite-States Model Predictive Control approach, leading to fast dynamic response and DC bus voltages equalization. The performance of the control scheme is evaluated with computer simulations.Fil: Verne, Santiago Andres. Universidad Nacional de La Plata. Facultad de Ingeniería. Departamento de Electrotecnia. Laboratorio de Electrónica Industrial y Control; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Valla, Maria Ines. Universidad Nacional de La Plata. Facultad de Ingeniería. Departamento de Electrotecnia. Laboratorio de Electrónica Industrial y Control; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentin
UPQC implemented with Cascade Asymmetric Multilevel Converters
No full textThe power quality (PQ) in distribution systems is affected by the pollution introduced by the customers. The Unified Power Quality Controller (UPQC) custom power device is the most integral actuator to improve the quality of the systems. Today, several manufacturers offer solutions using multilevel inverters in medium voltage applications with different control methods. In particular, the Cascaded Asymmetric Multilevel Converter (CAMC) is a novel alternative among the 5-level converters for back-to-back application. In this paper an UPQC with two CAMC in back-to-back connection is proposed. The hybrid modulation technique used in the CAMC made easier the implementation of the control objectives. Those are, regulating the voltage on sensitive load and control of its reactive power and harmonics current. They are carried out managing the active and reactive power into the UPQC. The model and the control strategy are discussed in d-q coordinates and the performance of the proposed UPQC is evaluated with SPICE simulations.Fil: González, Sergio Alejandro. Universidad Nacional de la Plata. Facultad de Ingeniería. Departamento de Electrotecnia. Laboratorio de Electrónica Industrial, Control e Instrumentación; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Valla, Maria Ines. Universidad Nacional de la Plata. Facultad de Ingeniería. Departamento de Electrotecnia. Laboratorio de Electrónica Industrial, Control e Instrumentación; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Multilevel Current-Source Inverter With FPGA Control
Full text linkIn this paper, a multilevel current-source inverter (MCSI) topology is analyzed. The issue of constructing a novel modular single-rating inductor MCSI is explored, taking advantage of the features of field-programmable gate arrays (FPGA) for control and gate signal generation. The proposed topology is built with identical modules where all inductors carry the same amount of current, simplifying the construction and operation of industrial applications with higher efficiency. A new state-machine approach, which is easy to implement in an FPGA, and a proper implementation of the phase-shifted carrier sinusoidal pulse width modulation (PSC-SPWM) allow both current balance in all modules and effective switching-frequency minimization. The performance of the MSCI proposed is simulated with Matlab and is verified by constructing a prototype.Fil: Aguirre, Miguel Pablo. Instituto Tecnológico de Buenos Aires; ArgentinaFil: Calvino, Laura. Instituto Tecnológico de Buenos Aires; ArgentinaFil: Valla, Maria Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ingeniería; Argentin
Adaptive observer for sensorless control of stand-alone doubly fed induction generator
Full text linkA sensorless control strategy for a doubly fed (wound rotor) induction machine working in variable-speed stand-alone power systems without using mechanical sensors is presented in this paper. Stator voltage magnitude and frequency are regulated using two field-oriented control loops. A Luenberger observer is used to estimate the stator flux, while an adaptive scheme modifies the rotor position required in the stator flux estimation. Stator voltage magnitude and frequency control loops behave very well for steady state as well as for transient states like startup, speed variations, or electric load changes. Experimental results are presented to validate this proposal.Fil: Forchetti, Daniel Gustavo. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: García, Guillermo Osvaldo. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; ArgentinaFil: Valla, Maria Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales. Universidad Nacional de La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales; Argentin
Predictive direct torque control using a cascade asymmetric multilevel converter
Full text linkA Direct Torque Control scheme which regulates the flux and the electromagnetictorque of an induction motor (IM) is presented in this paper. A Cascade Asymmetric Multilevel Converter (CAMC) drives the IM in 7-level mode using a new voltage value for the flying capacitors. An integrated control scheme based on the Finite-Control- Set Model Predictive Control (FCS-MPC) approach undertakes the solution as a unique multi-objective control problem. The algorithm directly selects theswitching states according to a rule of optimization and avoiding the use of modulators and nested controllers.Fil: Verne, Santiago Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales. Universidad Nacional de La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales; ArgentinaFil: González, Sergio Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales. Universidad Nacional de La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales; ArgentinaFil: Valla, Maria Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales. Universidad Nacional de La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales; Argentin
Five-level cascade asymmetric multilevel converter
Full text linkA five-level cascaded asymmetric multilevel converter is analysed and designed. This topologysynthesises five voltage levels with a reduced number of components when compared to the most common symmetric topologies. It allows getting more voltage levels with less switching states. Its behaviour is similar to a hybrid converter with the advantage of working with only one DC bus. It does not present the usual drawbacks of symmetrical topologies. The cascaded asymmetric converter, presented here, appears as a very attractive alternative among the five-level converters with no voltage balancing problem. The performance of the proposed topology is evaluated with Pspice simulations in different applications.Fil: Gonzalez, Sergio Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ingeniería; ArgentinaFil: Valla, Maria Ines. Universidad Nacional de La Plata. Facultad de Ingeniería; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Christiansen, C. F.. Universidad Nacional de La Plata. Facultad de Ingeniería; Argentin
Nonlinear control of a permanent magnet synchronous motor with disturbance torque estimation
Full text linkThis paper introduces a sensorless nonlinear control scheme for controlling the speed of a permanent magnet synchronous motor (PMSM) driving an unknown load torque. The states of the motor and disturbance torque are estimated via an extended nonlinear observer avoiding the use of mechanical sensors. The control strategy is an exact feedback linearization law, with trajectory tracking evaluated on estimated values of the PMSM states and the disturbance torque. The system performance is evaluated by simulations.Fil: Solsona, Jorge Alberto. Universidad Nacional del Comahue; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Valla, Maria Ines. Universidad Nacional de La Plata. Facultad de Ingeniería; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales. Universidad Nacional de La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales; ArgentinaFil: Muravchik, Carlos Horacio. Universidad Nacional de La Plata. Facultad de Ingeniería; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales. Universidad Nacional de La Plata. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales; Argentin
Analysis and simulation of a hydrogen based electric system to improve power quality in distributed grids
Full text linkRecent advances in hydrogen technologies allow the conversion between electric energy and hydrogen, increasing efficiency and reducing costs. Electric systems based on Hydrogen technology can be used to replace large battery banks in distribution systems, especially in green applications or where there is a big concern for environmental safety. A hydrogen based energy system with storage at high pressure allows smoothing the power variations which appear in electrical systems with a considerable proportion of wind and/or solar generation. A bidirectional Multilevel Current Source Inverter is used to interconnect an electrolyzer and a fuel cell within a low voltage distribution system with high efficiency and reliability. The proposed structure is simulated thoroughly with Matlab/Simulink, showing a proper behavior for the applications of interest.Fil: Aguirre, Miguel Pablo. Instituto Tecnológico de Buenos Aires. Facultad de Ingeniería. Departamento de Electrónica. Centro de Investigación y Desarrollo en Electrónica Industrial; ArgentinaFil: Couto, Hernán. Instituto Tecnológico de Buenos Aires. Facultad de Ingeniería. Departamento de Electrónica. Centro de Investigación y Desarrollo en Electrónica Industrial; ArgentinaFil: Valla, Maria Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ingeniería. Departamento de Electrotecnia. Laboratorio de Electrónica Industrial, Control e Instrumentación; Argentin
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