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Distributed approach for channel quality estimation using dedicated nodes in industrial WSN 25

Distributed approach for channel quality estimation using de...

引用

2014 25th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, IEEE PIMRC 2014

作者： Gomes, Ruan D. Rocha, Glaucio B. Filho, Abel C. Lima Fonseca, Iguatemi E. Alencar, Marcelo S. Post-Graduate Program in Electrical Engineering - PPgEE - Copele Campina Grande Paraíba Brazil Informatic Coordination Federal Institute of Paraíba Guarabira Paraíba Brazil Informatic Center Federal University of Paraiba João Pessoa Paraíba Brazil Mechanical Engineering Department Federal University of Paraiba João Pessoa Paraíba Brazil

ISBN: (纸本)9781479949120

A way to deal with the variations in the link quality of Wireless Sensor Networks (WSN) is the use of strategies for Dynamic Channel Allocation (DCA). The first step to perform DCA is estimating the channel quality, so that the network nodes can decide if a channel change is needed, and the best channel to be used. This paper proposes a distributed approach with nodes dedicated to monitor channel quality, by using the Received Signal Strength Indication (RSSI) and the Link Quality Indicator (LQI) to identify low quality channels. This approach is acceptable in industrial WSN, since the network deployment can be performed with adequate planning. Furthermore, the sensor nodes do not need to stop their operation for monitoring the channel quality. As a first step, experiments were performed in a real industrial environment to identify the relation between RSSI and LQI traces, and the Packet Error Rate for different channels, by using IEEE 802.15.4 radios operating in the 2.4 GHz band. © 2014 IEEE.

关键词： Sensor nodes

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Universal Active Power Filter Based on Three Three-Leg Converters and a Single DC-link

Universal Active Power Filter Based on Three Three-Leg Conve...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Phelipe L. S. Rodrigues Cursino B. Jacobina Andre E. L. Costa Ítalo A. Cavalcanti de Oliveira Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Federal University of Campina Grande (UFCG) Paraíba Brazil Department of Electrical Engineering Federal University of Campina Grande (UFCG) Paraíba Brazil

This paper presents a universal active power filter (UAPF) for harmonic and sag/swell voltage compensation based on the nine-leg converter and a single dc-link. The proposed UAPF combines three three-phase converters operating as series-shunt-series filters. An SV-PWM technique was used to improve the voltage levels generated by the converters by obtaining multilevel voltages. The connection made in the topology proposed in this paper allows an improvement in the harmonic distortions as well as the semiconductors losses. The complete control system is developed, simulation and experimental results are shown for validation purposes.

关键词： Topology Harmonic analysis Impedance Harmonic distortion Load modeling Active filters Power system harmonics

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Multilevel Single-Phase Four-Leg AC-DC-AC Converter

Multilevel Single-Phase Four-Leg AC-DC-AC Converter

引用

IEEE Energy Conversion Congress and Exposition

作者： Phelipe L. S. Rodrigues Cursino B. Jacobina Antonio M. N. Lima Post-Graduate Program in Electrical Engineering - PPgEE – COPELE Federal University of Campina Grande (UFCG) Paraíba Brazil Federal University of Campina Grande (UFCG) Paraíba Brazil

ISBN: (数字)9781728158266

ISBN: (纸本)9781728158273

This paper presents a single-phase four-leg ac-dc-ac converter, with one leg shared by the grid side and the load side. The proposed topology can generate input and output voltages with seven levels, presenting reduced harmonic distortion, in addition to using reduced voltage switches. The space-vector pulsewidth modulation strategy (SV-PWM), the control technique, the system model, and a comparison with a three-leg topology will be presented. As for performance comparison parameters, harmonic distortion in currents and voltages, the average switching frequency, and semiconductor losses will be used. The topology was simulated and assembled in the laboratory to obtain experimental results.

关键词： Topology Legged locomotion Switching frequency Mathematical model Switches Pulse width modulation Load modeling

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Cascaded Multilevel Rectifiers with Reduced Number of Controlled Switches for Open-End Winding PMSM

Cascaded Multilevel Rectifiers with Reduced Number of Contro...

引用

IEEE Energy Conversion Congress and Exposition

作者： Amanda P. Monteiro Cursino B. Jacobina Filipe A. C. Bahia Reuben P. R. Sousa Post-Graduate Program in Electrical Engineering - PPgEE/COPELE Campina Grande Paraíba Brazil Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Campina Grande Paraíba Brazil

This paper proposes three configurations of unidirectional open-end winding (OEW) cascaded multilevel rectifiers with reduced number of controlled switches. They are based on Vienna rectifiers and are composed of a series combination of two three-phase converters and three H-bridges employing floating capacitors (per phase). These configurations make the ac-dc conversion power, supplied by a permanent magnet synchronous machine (PMSM), which is connected to the rectifier by an OEW configuration. Compared to the conventional, proposed systems synthesize the same or higher number of voltage levels using fewer number of controlled switches and is still possible to obtain lower converter current harmonic distortion. Furthermore, they can operate with lower switch blocking voltage ratio. These features make them attractive options to the industry due to their low costs, low control complexity and size, besides they are more reliable and less prone to failure. Therefore, proposed configurations have a better cost-benefit than conventional one. The system model, PWM technique, capacitor voltage balancing and control strategy are given. Simulation and experimental results are provided in order to validate their feasibility.

关键词： Capacitors Voltage control Switches Reliability Topology Bridge circuits

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Ćuk DC-DC Converter with Multilevel Flying Capacitor Switching Cell

Ćuk DC-DC Converter with Multilevel Flying Capacitor Switch...

引用

IEEE Annual Southern Power Electronics Conference (SPEC)

作者： Vitor Freire Bezerra Rhavél Batista Morais Montiê Alves Vitorino Graduate Program in Electrical Engineering (PPgEE-COPELE) Industrial Electronics and Machine Drive Laboratory (LEIAM) Federal University of Campina Grande (UFCG)

The large industries that work with high power demand increasingly want to optimize their production lines. In this context, several studies and research about the multi-level power converts have been realized in last years, as they have several advantages when compared to traditional two-level topologies: better harmonic performance, filters reduction, lower components voltage stress and higher power process capability. The present work proposes a Cuk DC-DC converter composed of multilevel flying capacitor asymmetric totem-pole switching cell. This structure is achieved by replacing one leg of switch/diode of the traditional two-level asymmetric totem-pole cell by a similar multilevel flying capacitor cell. This work presents a brief analysis of the operation of the proposed converter, as well as the control strategy to keep the output voltage at the desired value and contains simulation results to validate the theoretical approach.

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Dual Vienna Rectifiers with a Single Dc-link for Wind Energy Conversion System Applications

Dual Vienna Rectifiers with a Single Dc-link for Wind Energy...

引用

IEEE Energy Conversion Congress and Exposition

作者： Amanda P. Monteiro Cursino B. Jacobina Filipe A. C. Bahia Reuben P. R. Sousa PPgEE/COPELE Post-Graduate Program in Electrical Engineering Federal University of Campina Grande (UFCG) Campina Grande Paraíba Brazil Federal University of Bahia (UFBA) Salvador Bahia Brazil

ISBN: (数字)9781728158266

ISBN: (纸本)9781728158273

In this paper, dual Vienna rectifiers are proposed for Wind Energy Conversion System (WECS) applications with Open-End Winding (OEW) Permanent Magnet Synchronous Generator (PMSG). Due to the reduced number of controlled switches, the proposed topologies have reduced costs and high reliability. Besides, they provide a better power quality using the same number of controlled switches than conventional structures presented in the literature, making them very attractive options for industry applications. The system model, space vector modulation, and control strategy are given. Simulation results are provided in order to validate their performance and feasibility.

关键词： Topology Voltage control Switches Power quality Power electronics

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Single-Phase Current Source Rectifier With Power Decoupling Using The X - Type CSC Topology

Single-Phase Current Source Rectifier With Power Decoupling ...

引用

Brazilian Power Electronics Conference, COBEP

作者： Montiê Alves Vitorino Lucas Vinícius de Araújo Gomes Graduate Program in Electrical Engineering (PPgEE-COPELE) Industrial Electronics and Machine Drive Laboratory (LEIAM) Federal University of Campina Grande (UFCG)

ISBN: (纸本)9781665421300

This work proposes a topology of X-Type Current Source Rectifier (X-type CSR) that helps to mitigate the effect of the double-the-line-frequency power ripple (low frequency) in the output of a single-phase rectifier. The low frequency ripple reduction allows to increase the converter power density by reducing the volume of the DC-bus inductor, without lack of stiffness at the DC-bus. The low frequency reduction is achieved by using a different single-phase CSR topology that uses the well known X-type CSC approach which allows reduction in conducting losses and independent control for two CSCs which share the same DC-bus and the middle switches of the leg. Details of topology, control strategy and modulation are presented. Simulation and experimental results for a 500W prototype are provided to validate the theoretical approach.

关键词： Legged locomotion Power system measurements Simulation Rectifiers Prototypes Power electronics Topology

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Universal active power filters based on nine-leg converter

Universal active power filters based on nine-leg converter

引用

IEEE Energy Conversion Congress and Exposition

作者： P. L. S. Rodrigues C. B. Jacobina G. A. d. A. Carlos Post-Graduate Program in Electrical Engineering - PPgEE - Copele Department of Electrical Engineering Federal University of Campina Grande (UFCG) Paraiba Brazil Universidade Federal de Campina Grande Campina Grande PB BR

This paper proposed two universal active power filter (UAPF) topologies for reactive power and harmonic compensation. The proposed system is a combination of series and shunt active power filters. They are suitable to improve the harmonic distortion in the grid currents and a voltage compensation. The filters are composed of three three-phase converters resulting in nine legs. The first (configuration I) can operate with floating dc-link capacitor or an auxiliary DC source on the series filter and the second one (configuration II) uses a combination of two series filters and one shunt filter sharing a single dc-link. The complete control system, including the PWM techniques, is developed and a comparison between the configurations is done. Simulation and experimental results are shown for validation purposes.

关键词： Pulse width modulation Voltage control Capacitors Harmonic analysis Power harmonic filters Control systems

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Six-phase open-end machine conversion system with reduced number of controlled components

Six-phase open-end machine conversion system with reduced nu...

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作者： Melo, Victor F. M. B. Jacobina, Cursino B. Rocha, Nady Marinus, Nustenil S. Post-Graduate Program in Electrical Engineering COPELE UFCG Campina Grande Paraíba Brazil Electrical Engineering Department Federal University of Campina Grande UFCG Campina Grande Paraíba Brazil Federal University of Paraíba UFPB João Pessoa Paraíba Brazil

ISBN: (纸本)9781479940325

This paper presents two six-phase open-end machine conversion systems. They are composed of three three-leg converters connected in series to a six-phase machine with open terminals, in an open-end winding connection. The converters use diodes to replace controlled switches, making the conversion system non-reversible and with a reduced number of controlled components. In this case, the machine must work always as a generator. A study concerning harmonic distortion and semiconductor losses is carried out. PWM and control strategies are developed. Simulation and experimental results in order to test these strategies are presented. © 2014 IEEE.

关键词： Energy conversion

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A New Three-Level Split-Inductor T-Type Inverter

A New Three-Level Split-Inductor T-Type Inverter

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Lucas Vinicius de Araújo Gomes Montiê Alves Vitorino Maurício Beltrão de Rossiter Corrêa Graduate Program in Electrical Engineering (PPgEE–COPELE) Industrial Electronics and Machine Drive Laboratory (LEIAM) Federal University of Campina Grande (UFCG)

ISBN: (数字)9798350376067

ISBN: (纸本)9798350376074

Some of the key requirements and trends in power electronics in recent years include improving efficiency as well as providing a energy quality while using a converter with high power density and long lifetime. Following these tendencies, multilevel T-type converters have the potential to improve the efficiency and performance of power conversion systems, especially in the renewable energy industry. A new multilevel converter with split-inductors is proposed, that offers dead-time elimination, shoot-through protection, ringing suppression and improved efficiency. Since the split-inductors are always connected in series with the switches, the protection against shoot-through is achieved by regulating the circulating current, eliminating the need for dead-time. Simulation and experimental results were shown to prove the functionality of the proposed converter.

关键词： Renewable energy sources Power system measurements Multilevel converters Market research Inverters Topology Power conversion Protection Signal analysis Integrated circuit reliability

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