Papers by Maximiliano Sonnaillon
Canadian Conference on Electrical and Computer Engineering, 2005.
A high-frequency digital lock-in amplifier that uses nonuniform sampling is proposed and validate... more A high-frequency digital lock-in amplifier that uses nonuniform sampling is proposed and validated experimentally. By using a random sampling strategy, it is possible to process periodic signals of frequencies several times greater than the Nyquist frequency, which is given by the sampling theorem. The implemented instrument, based on a digital signal processor and its associated hardware, is described in this paper. Experimental results show the advantages of the proposed lock-in.
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Resumen: Se propone un método para monitorear la temperatura interna de motores de alterna sin us... more Resumen: Se propone un método para monitorear la temperatura interna de motores de alterna sin usar sensores adicionales. Dicho método puede ser incorporado en accionamientos eléctricos estándar. Se basa en la variación de la resistividad con la temperatura de los bobinados de estator. Inyectando una pequeña señal de monitoreo de baja frecuencia, sumada a la corriente de alimentación, se mide en-línea la resistencia de estator. El método propuesto en este trabajo tiene la ventaja de funcionar con señales de monitoreo lo suficientemente bajas como para no perturbar el par de la máquina ni aumentar las pérdidas eléctricas en forma apreciable. Se presentan resultados experimentales que validan el método propuesto. ON-LINE SENSORLESS AC-MOTOR TEMPERATURE MONITORING Abstract: A sensorless AC-motor temperature monitoring method is proposed, which can be incorporated in standard motor drives. It is based in the stator-windings resistance variation with temperature. A small AC signal is injected superimposed to the feeding current, in order to measure on-line the stator resistance. The proposed method has the advantage of requiring very small monitoring signals; hence the motor torque perturbations and additional power losses are negligible. Experimental results that validate de proposed method are presented. Palabras clave: Monitoreo de temperatura, motor de alterna, inyección de señales
… Argentino de Control …, 2004
Resumen: En este trabajo se propone un método para estimar los estados de un motor de inducción a... more Resumen: En este trabajo se propone un método para estimar los estados de un motor de inducción alimentado por un inversor trifásico utilizando sólo un sensor de corriente. Midiendo la corriente de la barra de corriente continua es posible calcular las corrientes de fase conociendo ...
2009 5th Southern Conference on Programmable Logic (SPL), 2009
Particle image velocimetry (PIV) allows measuring distributed flow velocity fields. It is well es... more Particle image velocimetry (PIV) allows measuring distributed flow velocity fields. It is well established as an experimental tool in modern fluid dynamics research, being applied to liquid, gases and multiphase flows. Images of tracer particles are processed by means of a statistical strategy, which makes its real-time implementation difficult to achieve. In this paper, we describe the design and implementation of an embedded architecture for real-time PIV based on FPGA technology. The proposed scheme has allowed us to exploit the lowlevel parallelization in both, the direct cross-correlation computation and interrogation windows handling. We propose a bus architecture to manage multiple interfaces among the processing modules and external devices. By using this scheme, we achieved design flexibility and improved processing speed. Major benefits of the speed improvement are enhanced experimental capabilities like feedback control, on-line flow regimen visualization, and a significant speed up in off-line processing. We show experimental results of a physical field of velocities calculated in real-time.
Instrumentation and Measurement Ieee Transactions on, Mar 1, 2008
A high-frequency digital lock-in amplifier (LIA) that uses a random-sampling scheme is proposed a... more A high-frequency digital lock-in amplifier (LIA) that uses a random-sampling scheme is proposed and tested experimentally in this paper. By using this sampling strategy, it is possible to process, without aliasing effects, periodic signals of frequencies that are several times higher than the Nyquist frequency. Analytical and numerical analyses that show the advantages and limitations of the proposed scheme are presented. A high-frequency digital LIA implementation is also described. The prototype maximum sampling frequency is 150 kHz, and its maximum signal frequency without aliasing is 2.5 MHz, limited only by the random-sampling period quantization. Experimental results that validate the proposal are presented.
Ieee Transactions on Instrumentation and Measurement, Oct 1, 2010
This paper presents and analyzes a phase-locked loop (PLL) based on digital signal processing (DS... more This paper presents and analyzes a phase-locked loop (PLL) based on digital signal processing (DSP) and random sampling (RS). Traditional DSP techniques based on uniform sampling require sampling at more than twice the PLL frequency to avoid spectrum aliasing. This requirement makes difficult the implementation of high-frequency software-based PLLs. RS techniques allow significantly reducing the sampling speed requirements without aliasing effects. Lower speed requirements in the analog-to-digital converter (ADC) and the processing device enable the implementation of software PLLs for much higher frequencies than traditional techniques. The proposed PLL is mathematically analyzed to describe its operation and characterize its performance. A field-programmable gate array (FPGA)-based PLL prototype is presented to validate the theoretical analysis. Index Terms-Digital signal processing (DSP), high-frequency instrumentation, phase-locked loops (PLLs), random sampling (RS), software PLL. I. INTRODUCTION P HASE-LOCKED loops (PLLs) are systems commonly used in electronic circuits with different fields of applications. Their main task is synchronizing an internal oscillator with an external periodic reference. Typical applications of PLLs are communication systems, instrumentation, and electric power systems. Most PLLs are built with analog electronics based on discrete components or integrated circuits. This type of PLL is also called analog PLL. When digital elements are used in the PLL, they are called mixed signal or digital PLLs [1]. The signal processing performed by a PLL can also be carried out by means of digital signal processing (DSP). This type of PLL is usually called software PLL [1] because the processing is implemented by algorithms that run in a microprocessor. Software PLLs have many advantages with respect to hardware-based PLLs, such as their immunity to ambient conditions, accuracy, and reconfiguration capability, among all the benefits provided by DSP as compared with analog signal processing.
Three phase rectifier and rectification method
Random sampling in high-frequency digital Lock-In amplifiers
Latin American applied research Pesquisa aplicada latino americana = Investigación aplicada latinoamericana
Page 1. Latin American Applied Research 36:181-186 (2006) 181 RANDOM SAMPLING IN HIGH-FREQUENCY D... more Page 1. Latin American Applied Research 36:181-186 (2006) 181 RANDOM SAMPLING IN HIGH-FREQUENCY DIGITAL LOCK-IN AMPLIFIERS MO SONNAILLON, R. URTEAGA and FJ BONETTO Laboratorio de Cavitación y Biotecnología-Instituto Balseiro Av. ...
Resumen -En este trabajo se presenta la implementación de un algoritmo que realiza en tiempo real... more Resumen -En este trabajo se presenta la implementación de un algoritmo que realiza en tiempo real la modificación del tono de una señal de audio. Se utilizó una placa con un Procesador Digital de Señales (DSP) de bajo costo, orientada a aplicaciones de audio, con la que se lograron frecuencias de muestreo suficientes para procesar señales tanto de voz humana como de música, con una calidad muy aceptable. El funcionamiento en tiempo real de este algoritmo de relativa complejidad, requiere una implementación eficiente de las rutinas y un aprovechamiento máximo de la potencia de cálculo de este DSP. Se realizaron pruebas experimentales para comprobar la calidad de señal generada y la distorsión introducida. Palabras clave – DSP, Tiempo Real, Audio, Escalamiento I. INTRODUCCIÓN La modificación del tono de una señal de audio consiste básicamente en desplazar su espectro de frecuencia manteniendo la relación entre las distintas componentes armónicas, de manera de mantener las característi...
Oceans 2007, 2007
This paper presents the development of an advanced measurement system for real-time characterizat... more This paper presents the development of an advanced measurement system for real-time characterization of Vortex Induced Vibrations (VIV) in large-scale marine risers. Marine risers play a critical role in offshore oil and gas operations by transporting mud, debris, and hydrocarbons from the reservoir to the surface platform. The mechanical structure of the riser is constantly subject to the effect of vortex shedding produced by seawater flow, which may result in severe oscillations known as VIV. At present, the prediction of this potentially destructive phenomenon is a challenging area of research that has gained special attention. While there have been significant research contributions on vortex induced vibrations on small riser models (8-10 m in length), the number of experiments on large-scale risers is limited, mainly due to technical complexity, logistics, and cost involved in large scale testing. Furthermore, the experiments that have been carried out are often proprietary and their publication in scientific literature has been limited. High mode results have been a challenge since it is generally accepted that at least five accelerometers are required to accurately map a cycle, and most of the riser models have been instrumented with no more than ten or twenty accelerometers due to the associated technical challenges. The advanced system described herein is modular and has been tested with sixty-four accelerometers, theoretically capable of mapping 25 modes of vibration. This is, therefore, a significant development towards understanding the vortex shedding phenomenon at high modes. A complete description and design considerations for this advanced measurement system is presented in this paper. This includes aspects such as system architecture, hardware and software design, mounting procedure, and communication protocol for an actual application.
2008 4th Southern Conference on Programmable Logic, 2008
An integrated multi-harmonic control system based on Field Programmable Gate Array (FPGA) technol... more An integrated multi-harmonic control system based on Field Programmable Gate Array (FPGA) technology is developed in this article. The system was designed to generate a controlled multi-harmonic excitation for a non linear phenomenon: Single Bubble Sonoluminescence (SBSL). The target excitation for our experiment is constituted by a set of senoidal signals, the fundamental frequency and several harmonic frequencies. The FPGA device allowed the customized implementation and successfully integrated all the design requests in a single board. On line control over the largest number of harmonics ever reported in the literature is provided by the developed system. Experimental results show the integrated system performance.
FPGA Implementation of a Phase Locked Loop Based on Random Sampling
2007 3rd Southern Conference on Programmable Logic, 2007
A phase locked loop (PLL) based on digital signal processing and random sampling is proposed in t... more A phase locked loop (PLL) based on digital signal processing and random sampling is proposed in this paper. Field programmable gate array (FPGA) technology is used to implement a prototype. The random sampling scheme is used to reduce the sampling frequency requirements without aliasing effects. The possibility of sampling and processing at lower frequencies allows the implementation of complete-digital high-frequency
Review of Scientific Instruments, 2005
A high-performance digital lock-in amplifier implemented in a low-cost digital signal processor ͑... more A high-performance digital lock-in amplifier implemented in a low-cost digital signal processor ͑DSP͒ board is described. This lock in is capable of measuring simultaneously multiple frequencies that change in time as frequency sweeps ͑chirps͒. The used 32-bit DSP has enough computing power to generate N = 3 simultaneous reference signals and accurately measure the N = 3 responses, operating as three lock ins connected in parallel to a linear system. The lock in stores the measured values in memory until they are downloaded to the a personal computer ͑PC͒. The lock in works in stand-alone mode and can be programmed and configured through the PC serial port. Downsampling and multiple filter stages were used in order to obtain a sharp roll off and a long time constant in the filters. This makes measurements possible in presence of high-noise levels. Before each measurement, the lock in performs an autocalibration that measures the frequency response of analog output and input circuitry in order to compensate for the departure from ideal operation. Improvements from previous lock-in implementations allow measuring the frequency response of a system in a short time. Furthermore, the proposed implementation can measure how the frequency response changes with time, a characteristic that is very important in our biotechnological application. The number of simultaneous components that the lock in can generate and measure can be extended, without reprogramming, by only using other DSPs of the same family that are code compatible and work at higher clock frequencies.
Review of Scientific Instruments, 2007
This article proposes an analytical algorithm for predicting errors in lock-in amplifiers ͑LIAs͒ ... more This article proposes an analytical algorithm for predicting errors in lock-in amplifiers ͑LIAs͒ working with time-varying reference frequency. Furthermore, a simple method for correcting such errors is presented. The reference frequency can be swept in order to measure the frequency response of a system within a given spectrum. The continuous variation of the reference frequency produces a measurement error that depends on three factors: the sweep speed, the LIA low-pass filters, and the frequency response of the measured system. The proposed error prediction algorithm is based on the final value theorem of the Laplace transform. The correction method uses a double-sweep measurement. A mathematical analysis is presented and validated with computational simulations and experimental measurements.
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Resumen: Se propone un nuevo método para medir los parámetros del circuito equivalente de máquina... more Resumen: Se propone un nuevo método para medir los parámetros del circuito equivalente de máquinas de inducción en forma automática. La medición se basa en tres ensayos de dominio frecuencial que funcionan con el rotor detenido, evitando la necesidad de realizar los ensayos a rotor bloqueado y en vacío. Los algoritmos propuestos pueden ser implementados en accionamientos estándar para realizar la parametrización del controlador automáticamente. El método propuesto además permite medir en forma directa la saturación del núcleo de la máquina. Se presentan resultados experimentales que validan la propuesta. AUTOMATIC INDUCTION MACHINE PARAMETER MEASUREMENT USING STANDSTILL FREQUENCY-DOMAIN TESTS Abstract: A new method to measure the induction machine equivalent circuit parameters (ECP) is proposed. The measurement is based on three frequency domain tests that are performed at standstill, avoiding the locked-rotor and no-load tests. The proposed algorithms can be implemented in standard motor drives in order to carry out the self-commissioning procedure automatically. Furthermore, the proposed method allows measuring directly the machine saturation. Experimental results are presented to validate the proposal. Palabras clave: motor de inducción, parámetros del circuito equivalente (ECP), ensayos en dominio frecuencial, saturación
… and Measurement, IEEE …, 2010
This paper presents and analyzes a phase-locked loop (PLL) based on digital signal processing (DS... more This paper presents and analyzes a phase-locked loop (PLL) based on digital signal processing (DSP) and random sampling (RS). Traditional DSP techniques based on uniform sampling require sampling at more than twice the PLL frequency to avoid spectrum aliasing. This requirement makes difficult the implementation of high-frequency software-based PLLs. RS techniques allow significantly reducing the sampling speed requirements without aliasing effects. Lower speed requirements in the analog-to-digital converter (ADC) and the processing device enable the implementation of software PLLs for much higher frequencies than traditional techniques. The proposed PLL is mathematically analyzed to describe its operation and characterize its performance. A field-programmable gate array (FPGA)-based PLL prototype is presented to validate the theoretical analysis. Index Terms-Digital signal processing (DSP), high-frequency instrumentation, phase-locked loops (PLLs), random sampling (RS), software PLL. I. INTRODUCTION P HASE-LOCKED loops (PLLs) are systems commonly used in electronic circuits with different fields of applications. Their main task is synchronizing an internal oscillator with an external periodic reference. Typical applications of PLLs are communication systems, instrumentation, and electric power systems. Most PLLs are built with analog electronics based on discrete components or integrated circuits. This type of PLL is also called analog PLL. When digital elements are used in the PLL, they are called mixed signal or digital PLLs [1]. The signal processing performed by a PLL can also be carried out by means of digital signal processing (DSP). This type of PLL is usually called software PLL [1] because the processing is implemented by algorithms that run in a microprocessor. Software PLLs have many advantages with respect to hardware-based PLLs, such as their immunity to ambient conditions, accuracy, and reconfiguration capability, among all the benefits provided by DSP as compared with analog signal processing.
This paper presents a control method for permanent magnet (PM) motors based on a combination of a... more This paper presents a control method for permanent magnet (PM) motors based on a combination of a non linear full-order observer and a signal injection scheme. Mechanical-sensorless operating range down to zero speed is obtained using only voltage and current sensors. The signal injection scheme uses the asymmetry of the motor's d and q axis inductances to estimate rotor position and speed. Such asymmetry is also taken into account in the motor model used to construct the observer. The performance of the proposed scheme is validated through experimental results.
Iet Electric Power Applications, 2007
A new method to measure the induction machine equivalent circuit parameters is proposed. The meth... more A new method to measure the induction machine equivalent circuit parameters is proposed. The method is based on three frequency-domain tests, performed at standstill, avoiding then the locked-rotor and no-load tests. The proposed algorithm can be implemented in standard motor drives in order to automatically perform self-commissioning. Furthermore, the proposed method allows a direct measurement of the iron saturation. Experimental results are presented to validate the measurement method and the machine equivalent circuit.
This paper presents an embedded frequency response analyzer (EFRA) for fuel cells (FC) based on a... more This paper presents an embedded frequency response analyzer (EFRA) for fuel cells (FC) based on a low-cost digital signal processor (DSP). Frequency response analysis technique provides valuable information of different electrochemical processes that occur inside the FC. The small size and low power consumption allows this special device to be embedded into the FC controller or the power conditioning stage. The system is capable of measuring automatically the frequency response of the FC at different operating points, even when the FC is operating with load. These measurements can be used to characterize the FC at design stage and to perform on-line monitoring of the FC state during continuous operation. The proposed instrument uses the lock-in amplification technique, which allows very accurate and precise measurements even in the presence of high noise levels. The proposed hardware and signal processing technique are described in this paper including experimental result of a 1.2 kW proton exchange membrane fuel cell (PEMFC) system
IEEE Transactions on Energy Conversion, 2010
A sensorless internal temperature monitoring method for induction motors is proposed in this pape... more A sensorless internal temperature monitoring method for induction motors is proposed in this paper. This method can be embedded in standard motor drives, and is based on the stator windings resistance variation with temperature. A small ac signal is injected to the motor, superimposed to the power supply current, in order to measure the stator resistance online. The proposed method has the advantage of requiring a very low-level monitoring signal, hence the motor torque perturbations and additional power losses are negligible. Furthermore, temperature estimations do not depend on the knowledge of any other motor parameter, since the method is not based on a model. This makes the proposed method more robust than model-based methods. Experimental results that validate the proposal are also presented.
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Papers by Maximiliano Sonnaillon