Carlos Couto | Universidade do Minho (original) (raw)

Papers by Carlos Couto

Research paper thumbnail of A Comlbined SeriesActive Filter andPassive Filters forHarmonics,Unbalances andFlicker Compensation

Thispaperdescribes acombined operation involving a series active filter andshuntpassive filters f... more Thispaperdescribes acombined operation involving a series active filter andshuntpassive filters forthree-phase three-wire systems. Theseries active filter isabletominimize PowerQuality problems like unbalances, harmonics andflicker observed atthesystem voltages. Another taskfortheseries active filter istodamppossible resonances involving thepassive filters andthesystem impedance. Theshuntpassive filters aredesigned todrainharmonic current-components generated bytheload. Thecontrol strategy oftheseries active conditioner isbasedon theinstantaneous powertheoryon a-fl-O reference frame, together witharobust synchronizing circuit PLL(Phase-Locked- Loop).A dc-link voltage controller, applied to theseries conditioner, isalsointroduced duetothefact thatthere isonlya single capacitor attheinverter dc-side. Simulation results on PSCAD(/EMTDCTMarepresented in ordertoverify the performance involving acombined operation ofpassive andactive filters. IndexTerms - CustomPower,Power Quality, System Stability, Instantaneous PowerTheory.

Research paper thumbnail of A Comlbined SeriesActive Filter andPassive Filters forHarmonics,Unbalances andFlicker Compensation

Thispaperdescribes acombined operation involving a series active filter andshuntpassive filters f... more Thispaperdescribes acombined operation involving a series active filter andshuntpassive filters forthree-phase three-wire systems. Theseries active filter isabletominimize PowerQuality problems like unbalances, harmonics andflicker observed atthesystem voltages. Another taskfortheseries active filter istodamppossible resonances involving thepassive filters andthesystem impedance. Theshuntpassive filters aredesigned todrainharmonic current-components generated bytheload. Thecontrol strategy oftheseries active conditioner isbasedon theinstantaneous powertheoryon a-fl-O reference frame, together witharobust synchronizing circuit PLL(Phase-Locked- Loop).A dc-link voltage controller, applied to theseries conditioner, isalsointroduced duetothefact thatthere isonlya single capacitor attheinverter dc-side. Simulation results on PSCAD(/EMTDCTMarepresented in ordertoverify the performance involving acombined operation ofpassive andactive filters. IndexTerms - CustomPower,Power Quality, System...

Research paper thumbnail of MiADL: Architecture description language for design space exploration

3rd IFAC Workshop on Discrete-Event System Design (2006), 2006

Research paper thumbnail of Qualidade de energia eléctrica

Research paper thumbnail of Autoreb: robotization of the deburring of casting pieces

Research paper thumbnail of Transformerless series active power filter to compensate voltage disturbances

Research paper thumbnail of Simulations of a current-source Shunt Active Power Filter with Carrier-Based PWM and Periodic Sampling modulation techniques

Research paper thumbnail of Intelligent signal processing for ratiometric data acquisition: a low cost solution for load cells

Research paper thumbnail of Células de carga inteligentes

Research paper thumbnail of Calibration of a multi-load cells weighing system based on neural networks

Research paper thumbnail of Modeling and simulation of a silicon soil moisture sensor based on the DPHP method for agriculture

Research paper thumbnail of A Multi-Chip-Nodule Micro-System for Soil Moisture Measurements

Research paper thumbnail of A 2.4-GHz RF CMOS Transceiver for Wireless Sensor Applications

This paper describes a radio frequency transceiver designed in UMC RF 0.18 μm CMOS process. This ... more This paper describes a radio frequency transceiver designed in UMC RF 0.18 μm CMOS process. This process has a poly and six metal layers, allowing the use of integrated spiral inductors (with a reasonable quality factor), high resistor value (a special layer is available) and a ...

Research paper thumbnail of Optimization of thermoelectric thin-films deposited by co-evaporation on plastic substrates

Research paper thumbnail of A Miniaturized Self-Calibrated Pyrometer Microsystem

Summary: This paper describes the design, modeling and optimization of a miniaturized self-calibr... more Summary: This paper describes the design, modeling and optimization of a miniaturized self-calibrated pyrometer to detect infrared radiation (in 5-20 µm range of wavelengths) in order to measure the real temperature of objects without contact. The microsystem consists of a ...

Research paper thumbnail of Induction Motor Slip Control With Efficiency Optimization Using Fuzzy Logic Techniques

This paper describes a fuzzy logic based slip controller for an induction motor, with efficiency ... more This paper describes a fuzzy logic based slip controller for an induction motor, with efficiency optimization for steady state operation. The speed control is accomplished through a Mandani type fuzzy controller, with 11 rules, taking speed error (built with 5 Membership Functions ...

Research paper thumbnail of Low-Power Low-Voltage RF CMOS Transceiver at 2.4 GHz

CONFTELE. Conference …, 2005

CMOS technology has reached its maturity. Therefore, design engineers used it for developing RF c... more CMOS technology has reached its maturity. Therefore, design engineers used it for developing RF circuits. The advantages of CMOS technology are the higher integration, low-power consumption, low-voltage supply and low-cost compared with Bipolar technology. The ...

Research paper thumbnail of A MCM-Based Microsystem for Soil Moisture Measurements

This work presents a Multi-Chip-Module (MCM) based microsystem for irrigation control in agricult... more This work presents a Multi-Chip-Module (MCM) based microsystem for irrigation control in agriculture. The proposed microsystem includes a soil moisture microsensor, an analog-to-digital converter, signal processing circuits (digital filtering and sensor interface) and a RF ...

Research paper thumbnail of Actuation, Monitoring and Control of Fabrics Feeding During High-Speed Sewing

International …, 2003

Actuation, monitoring, and control of fabrics feeding during high-speed sewing LF SILVA, M LIMA, ... more Actuation, monitoring, and control of fabrics feeding during high-speed sewing LF SILVA, M LIMA, H CARVALHO, AM ROCHA, FN FERREIRA, JL MONTEIRO, and C COUTO School of Engineering, University of Mmho Guimaraes, Portugal SYNOPSIS For some years now ...

Research paper thumbnail of Active Filters With Control Based on the Pq Theory

Due the intensive use of power converters and other non-linear loads in industry and by consumers... more Due the intensive use of power converters and other non-linear loads in industry and by consumers in general, it can be observed an increasing deterioration of the power systems voltage and current waveforms. The presence of harmonics in the power lines results in greater power losses ...

Research paper thumbnail of A Comlbined SeriesActive Filter andPassive Filters forHarmonics,Unbalances andFlicker Compensation

Thispaperdescribes acombined operation involving a series active filter andshuntpassive filters f... more Thispaperdescribes acombined operation involving a series active filter andshuntpassive filters forthree-phase three-wire systems. Theseries active filter isabletominimize PowerQuality problems like unbalances, harmonics andflicker observed atthesystem voltages. Another taskfortheseries active filter istodamppossible resonances involving thepassive filters andthesystem impedance. Theshuntpassive filters aredesigned todrainharmonic current-components generated bytheload. Thecontrol strategy oftheseries active conditioner isbasedon theinstantaneous powertheoryon a-fl-O reference frame, together witharobust synchronizing circuit PLL(Phase-Locked- Loop).A dc-link voltage controller, applied to theseries conditioner, isalsointroduced duetothefact thatthere isonlya single capacitor attheinverter dc-side. Simulation results on PSCAD(/EMTDCTMarepresented in ordertoverify the performance involving acombined operation ofpassive andactive filters. IndexTerms - CustomPower,Power Quality, System Stability, Instantaneous PowerTheory.

Research paper thumbnail of A Comlbined SeriesActive Filter andPassive Filters forHarmonics,Unbalances andFlicker Compensation

Thispaperdescribes acombined operation involving a series active filter andshuntpassive filters f... more Thispaperdescribes acombined operation involving a series active filter andshuntpassive filters forthree-phase three-wire systems. Theseries active filter isabletominimize PowerQuality problems like unbalances, harmonics andflicker observed atthesystem voltages. Another taskfortheseries active filter istodamppossible resonances involving thepassive filters andthesystem impedance. Theshuntpassive filters aredesigned todrainharmonic current-components generated bytheload. Thecontrol strategy oftheseries active conditioner isbasedon theinstantaneous powertheoryon a-fl-O reference frame, together witharobust synchronizing circuit PLL(Phase-Locked- Loop).A dc-link voltage controller, applied to theseries conditioner, isalsointroduced duetothefact thatthere isonlya single capacitor attheinverter dc-side. Simulation results on PSCAD(/EMTDCTMarepresented in ordertoverify the performance involving acombined operation ofpassive andactive filters. IndexTerms - CustomPower,Power Quality, System...

Research paper thumbnail of MiADL: Architecture description language for design space exploration

3rd IFAC Workshop on Discrete-Event System Design (2006), 2006

Research paper thumbnail of Qualidade de energia eléctrica

Research paper thumbnail of Autoreb: robotization of the deburring of casting pieces

Research paper thumbnail of Transformerless series active power filter to compensate voltage disturbances

Research paper thumbnail of Simulations of a current-source Shunt Active Power Filter with Carrier-Based PWM and Periodic Sampling modulation techniques

Research paper thumbnail of Intelligent signal processing for ratiometric data acquisition: a low cost solution for load cells

Research paper thumbnail of Células de carga inteligentes

Research paper thumbnail of Calibration of a multi-load cells weighing system based on neural networks

Research paper thumbnail of Modeling and simulation of a silicon soil moisture sensor based on the DPHP method for agriculture

Research paper thumbnail of A Multi-Chip-Nodule Micro-System for Soil Moisture Measurements

Research paper thumbnail of A 2.4-GHz RF CMOS Transceiver for Wireless Sensor Applications

This paper describes a radio frequency transceiver designed in UMC RF 0.18 μm CMOS process. This ... more This paper describes a radio frequency transceiver designed in UMC RF 0.18 μm CMOS process. This process has a poly and six metal layers, allowing the use of integrated spiral inductors (with a reasonable quality factor), high resistor value (a special layer is available) and a ...

Research paper thumbnail of Optimization of thermoelectric thin-films deposited by co-evaporation on plastic substrates

Research paper thumbnail of A Miniaturized Self-Calibrated Pyrometer Microsystem

Summary: This paper describes the design, modeling and optimization of a miniaturized self-calibr... more Summary: This paper describes the design, modeling and optimization of a miniaturized self-calibrated pyrometer to detect infrared radiation (in 5-20 µm range of wavelengths) in order to measure the real temperature of objects without contact. The microsystem consists of a ...

Research paper thumbnail of Induction Motor Slip Control With Efficiency Optimization Using Fuzzy Logic Techniques

This paper describes a fuzzy logic based slip controller for an induction motor, with efficiency ... more This paper describes a fuzzy logic based slip controller for an induction motor, with efficiency optimization for steady state operation. The speed control is accomplished through a Mandani type fuzzy controller, with 11 rules, taking speed error (built with 5 Membership Functions ...

Research paper thumbnail of Low-Power Low-Voltage RF CMOS Transceiver at 2.4 GHz

CONFTELE. Conference …, 2005

CMOS technology has reached its maturity. Therefore, design engineers used it for developing RF c... more CMOS technology has reached its maturity. Therefore, design engineers used it for developing RF circuits. The advantages of CMOS technology are the higher integration, low-power consumption, low-voltage supply and low-cost compared with Bipolar technology. The ...

Research paper thumbnail of A MCM-Based Microsystem for Soil Moisture Measurements

This work presents a Multi-Chip-Module (MCM) based microsystem for irrigation control in agricult... more This work presents a Multi-Chip-Module (MCM) based microsystem for irrigation control in agriculture. The proposed microsystem includes a soil moisture microsensor, an analog-to-digital converter, signal processing circuits (digital filtering and sensor interface) and a RF ...

Research paper thumbnail of Actuation, Monitoring and Control of Fabrics Feeding During High-Speed Sewing

International …, 2003

Actuation, monitoring, and control of fabrics feeding during high-speed sewing LF SILVA, M LIMA, ... more Actuation, monitoring, and control of fabrics feeding during high-speed sewing LF SILVA, M LIMA, H CARVALHO, AM ROCHA, FN FERREIRA, JL MONTEIRO, and C COUTO School of Engineering, University of Mmho Guimaraes, Portugal SYNOPSIS For some years now ...

Research paper thumbnail of Active Filters With Control Based on the Pq Theory

Due the intensive use of power converters and other non-linear loads in industry and by consumers... more Due the intensive use of power converters and other non-linear loads in industry and by consumers in general, it can be observed an increasing deterioration of the power systems voltage and current waveforms. The presence of harmonics in the power lines results in greater power losses ...