C. Raga - Academia.edu (original) (raw)
Papers by C. Raga
2015 9th International Conference on Compatibility and Power Electronics (CPE), 2015
2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2013
ABSTRACT The increasing miniaturization in the satellite industry, together with the use of solar... more ABSTRACT The increasing miniaturization in the satellite industry, together with the use of solar energy as main energy source has given rise to a new generation of electrically powered space probes. These new probes are featured by a small size and weight. In this paper, a DC-DC converter that adapts the energy produced by solar arrays to supply an electric thruster is proposed. This type of thruster demands high DC voltage, whereas the solar array gives out a low DC voltage with limited power. Hence, this converter must have high voltage gain and low power. A topology comprised of a step-up transformer, a resonant tank and a voltage multiplier in cascade is proposed to meet these requirements. In addition, an optimization study is made to spot a design criterion. Finally, a low scale prototype is tested and experimental results are shown.
2015 9th International Conference on Compatibility and Power Electronics (CPE), 2015
2007 IEEE International Symposium on Industrial Electronics, 2007
... Multi-phase VRM by applying Linear-Non-Linear ontro J. Quintero, A. Barrado, M. Sanz, C. Raga... more ... Multi-phase VRM by applying Linear-Non-Linear ontro J. Quintero, A. Barrado, M. Sanz, C. Raga, A. Laizaro Universidad Carlos III de Madrid Departamento de Tecnologia Electronica Grupo de Sistemas Electronicos de Potencia Avda. ...
2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2012
System-level modeling and simulation are powerful tools to evaluate the system-level behavior of ... more System-level modeling and simulation are powerful tools to evaluate the system-level behavior of new power distribution systems. However, due to confidentiality of manufacturers, black-box behavioral models of the converters are required instead of conventional ones. This paper proposes a black-box modeling method of DC-DC converters with input current control, oriented to fuel cells power conditioning. The model is simple and the identification procedure is based on straightforward experiments. The model does not represent the internal structure of the converter, thus maintaining manufacturer's confidentiality. The method is validated using a commercial DC-DC converter for fuel-cells power conditioning.
2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition, 2009
Page 1. Easy Modeling and Identification Procedure for Black Box Behavioral Models of Power Ele... more Page 1. Easy Modeling and Identification Procedure for Black Box Behavioral Models of Power Electronics Converters with Reduced Order Based on Transient Response Analysis V. Valdivia, A. Barrado, A. Lázaro, P. Zumel, C. Raga ...
2015 IEEE Applied Power Electronics Conference and Exposition (APEC), 2015
2009 Compatability and Power Electronics, 2009
The use of fuel cells as main source of energy is suffering an important increase, due to their c... more The use of fuel cells as main source of energy is suffering an important increase, due to their continuous improvements and their good performances. Fuel cells are being used in very different industrial applications, and they are being particularly applied in automotive field. So, there is an important growing in the study of new power distribution architectures based on fuel
2011 7th International Conference-Workshop Compatibility and Power Electronics (CPE), 2011
AC power supplies generated by means of an inverter are under very restrictive specifications reg... more AC power supplies generated by means of an inverter are under very restrictive specifications regarding their AC output voltage THD, even when they are supplying both linear and nonlinear loads. The presence of the low frequency harmonic content due to nonlinear loads operation, greatly increase the THD of the AC power supply output voltage. Traditional state of the art techniques
2014 IEEE Energy Conversion Congress and Exposition (ECCE), 2014
2008 34th Annual Conference of IEEE Industrial Electronics, 2008
Continuous improvements in features of fuel cells make possible their use as main source of energ... more Continuous improvements in features of fuel cells make possible their use as main source of energy in many varied applications. However, their slow dynamic response force to implement secondary sources of energy which supply strong changes in the load, and they also allow to store the reverse current from the load. In this paper, four electrical power distribution architectures are
2012 IEEE Energy Conversion Congress and Exposition (ECCE), 2012
ABSTRACT Fuel cells are one of the main power sources to be used in a future on-board field. Powe... more ABSTRACT Fuel cells are one of the main power sources to be used in a future on-board field. Power distribution architectures based on fuel cells, batteries and supercapacitors for hybrid vehicles are large and complex systems due to the high number and nature of power converters, loads, secondary energy sources, etc. So, in order to accurately design at system level, the use of modeling and simulation tools is essential. This paper proposes a black-box fuel cell model, which reproduces the overdamped transient response of commercial fuel cells. The fuel cell model is parameterized from manufacturer's datasheets and from a test based on load steps, through a simple methodology provided along this paper. The black-box fuel cell model is validated experimentally through a commercial fuel cell.
2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition, 2008
Solid state power controller (SSPC) is being utilized in spacecraft and aircraft power distributi... more Solid state power controller (SSPC) is being utilized in spacecraft and aircraft power distribution system in order to replace conventional electro-mechanical circuit like breakers, contactors and relays. Since power distribution on-board systems are very complex, SSPC models play an important role in order to predict the real behaviour and to avoid design fails in future applications. The main aim of
2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition, 2009
The development of new aircrafts, such as A380 and B787, has provided new opportunities in the fi... more The development of new aircrafts, such as A380 and B787, has provided new opportunities in the field of electronic devices and power electronics. One of the most interesting areas is focused on the protection devices field and the management of the loads by means of the solid state power controllers (SSPC). This fact is mainly due to the great increase of these devices in the architectures of the electrical power distribution systems used in the new airplanes. In this paper, the areas of interest for research groups regarding SSPC in onboard platforms are presented. Also, behavioural SSPC model has been developed according with different manufacturers datasheets. Moreover, experimental validation with commercial SSPC are presented.
2008 34th Annual Conference of IEEE Industrial Electronics, 2008
ABSTRACT
2014 IEEE Vehicle Power and Propulsion Conference (VPPC), 2014
2008 34th Annual Conference of IEEE Industrial Electronics, 2008
... Each considered load condition provokes a voltage drop across the filter inductance (L) and m... more ... Each considered load condition provokes a voltage drop across the filter inductance (L) and mainly across the parasitic series resistance (Rεcc) that modifies the filter transfer function (GF), as it can be observed in Figure 2. Therefore, in order to compensate the described effect ...
2008 IEEE Power Electronics Specialists Conference, 2008
The use of Fuel Cells as main source of energy is being extended to automobile applications, due ... more The use of Fuel Cells as main source of energy is being extended to automobile applications, due to their good performance. However, Fuel Cells cannot fulfil with strong load requirements produced during the vehicle operation. So, a secondary energy source must be used in order to provide fast changes in the current load, and to store the reverse current generated by the load, if regenerative braking is intended.
2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition, 2009
... V. Valdivia, A. Barrado, A. Lázaro, P. Zumel, C. Raga ... Keywords Behavioral Modeling, Non... more ... V. Valdivia, A. Barrado, A. Lázaro, P. Zumel, C. Raga ... Keywords Behavioral Modeling, Nonlinear Modeling, Black Box Modeling, Grey Box Modeling, Voltage Controlled, Buck Derived, Buck, Forward, Push Pull, Full Bridge, Half Bridge, Identification ...
2015 9th International Conference on Compatibility and Power Electronics (CPE), 2015
2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2013
ABSTRACT The increasing miniaturization in the satellite industry, together with the use of solar... more ABSTRACT The increasing miniaturization in the satellite industry, together with the use of solar energy as main energy source has given rise to a new generation of electrically powered space probes. These new probes are featured by a small size and weight. In this paper, a DC-DC converter that adapts the energy produced by solar arrays to supply an electric thruster is proposed. This type of thruster demands high DC voltage, whereas the solar array gives out a low DC voltage with limited power. Hence, this converter must have high voltage gain and low power. A topology comprised of a step-up transformer, a resonant tank and a voltage multiplier in cascade is proposed to meet these requirements. In addition, an optimization study is made to spot a design criterion. Finally, a low scale prototype is tested and experimental results are shown.
2015 9th International Conference on Compatibility and Power Electronics (CPE), 2015
2007 IEEE International Symposium on Industrial Electronics, 2007
... Multi-phase VRM by applying Linear-Non-Linear ontro J. Quintero, A. Barrado, M. Sanz, C. Raga... more ... Multi-phase VRM by applying Linear-Non-Linear ontro J. Quintero, A. Barrado, M. Sanz, C. Raga, A. Laizaro Universidad Carlos III de Madrid Departamento de Tecnologia Electronica Grupo de Sistemas Electronicos de Potencia Avda. ...
2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2012
System-level modeling and simulation are powerful tools to evaluate the system-level behavior of ... more System-level modeling and simulation are powerful tools to evaluate the system-level behavior of new power distribution systems. However, due to confidentiality of manufacturers, black-box behavioral models of the converters are required instead of conventional ones. This paper proposes a black-box modeling method of DC-DC converters with input current control, oriented to fuel cells power conditioning. The model is simple and the identification procedure is based on straightforward experiments. The model does not represent the internal structure of the converter, thus maintaining manufacturer's confidentiality. The method is validated using a commercial DC-DC converter for fuel-cells power conditioning.
2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition, 2009
Page 1. Easy Modeling and Identification Procedure for Black Box Behavioral Models of Power Ele... more Page 1. Easy Modeling and Identification Procedure for Black Box Behavioral Models of Power Electronics Converters with Reduced Order Based on Transient Response Analysis V. Valdivia, A. Barrado, A. Lázaro, P. Zumel, C. Raga ...
2015 IEEE Applied Power Electronics Conference and Exposition (APEC), 2015
2009 Compatability and Power Electronics, 2009
The use of fuel cells as main source of energy is suffering an important increase, due to their c... more The use of fuel cells as main source of energy is suffering an important increase, due to their continuous improvements and their good performances. Fuel cells are being used in very different industrial applications, and they are being particularly applied in automotive field. So, there is an important growing in the study of new power distribution architectures based on fuel
2011 7th International Conference-Workshop Compatibility and Power Electronics (CPE), 2011
AC power supplies generated by means of an inverter are under very restrictive specifications reg... more AC power supplies generated by means of an inverter are under very restrictive specifications regarding their AC output voltage THD, even when they are supplying both linear and nonlinear loads. The presence of the low frequency harmonic content due to nonlinear loads operation, greatly increase the THD of the AC power supply output voltage. Traditional state of the art techniques
2014 IEEE Energy Conversion Congress and Exposition (ECCE), 2014
2008 34th Annual Conference of IEEE Industrial Electronics, 2008
Continuous improvements in features of fuel cells make possible their use as main source of energ... more Continuous improvements in features of fuel cells make possible their use as main source of energy in many varied applications. However, their slow dynamic response force to implement secondary sources of energy which supply strong changes in the load, and they also allow to store the reverse current from the load. In this paper, four electrical power distribution architectures are
2012 IEEE Energy Conversion Congress and Exposition (ECCE), 2012
ABSTRACT Fuel cells are one of the main power sources to be used in a future on-board field. Powe... more ABSTRACT Fuel cells are one of the main power sources to be used in a future on-board field. Power distribution architectures based on fuel cells, batteries and supercapacitors for hybrid vehicles are large and complex systems due to the high number and nature of power converters, loads, secondary energy sources, etc. So, in order to accurately design at system level, the use of modeling and simulation tools is essential. This paper proposes a black-box fuel cell model, which reproduces the overdamped transient response of commercial fuel cells. The fuel cell model is parameterized from manufacturer's datasheets and from a test based on load steps, through a simple methodology provided along this paper. The black-box fuel cell model is validated experimentally through a commercial fuel cell.
2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition, 2008
Solid state power controller (SSPC) is being utilized in spacecraft and aircraft power distributi... more Solid state power controller (SSPC) is being utilized in spacecraft and aircraft power distribution system in order to replace conventional electro-mechanical circuit like breakers, contactors and relays. Since power distribution on-board systems are very complex, SSPC models play an important role in order to predict the real behaviour and to avoid design fails in future applications. The main aim of
2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition, 2009
The development of new aircrafts, such as A380 and B787, has provided new opportunities in the fi... more The development of new aircrafts, such as A380 and B787, has provided new opportunities in the field of electronic devices and power electronics. One of the most interesting areas is focused on the protection devices field and the management of the loads by means of the solid state power controllers (SSPC). This fact is mainly due to the great increase of these devices in the architectures of the electrical power distribution systems used in the new airplanes. In this paper, the areas of interest for research groups regarding SSPC in onboard platforms are presented. Also, behavioural SSPC model has been developed according with different manufacturers datasheets. Moreover, experimental validation with commercial SSPC are presented.
2008 34th Annual Conference of IEEE Industrial Electronics, 2008
ABSTRACT
2014 IEEE Vehicle Power and Propulsion Conference (VPPC), 2014
2008 34th Annual Conference of IEEE Industrial Electronics, 2008
... Each considered load condition provokes a voltage drop across the filter inductance (L) and m... more ... Each considered load condition provokes a voltage drop across the filter inductance (L) and mainly across the parasitic series resistance (Rεcc) that modifies the filter transfer function (GF), as it can be observed in Figure 2. Therefore, in order to compensate the described effect ...
2008 IEEE Power Electronics Specialists Conference, 2008
The use of Fuel Cells as main source of energy is being extended to automobile applications, due ... more The use of Fuel Cells as main source of energy is being extended to automobile applications, due to their good performance. However, Fuel Cells cannot fulfil with strong load requirements produced during the vehicle operation. So, a secondary energy source must be used in order to provide fast changes in the current load, and to store the reverse current generated by the load, if regenerative braking is intended.
2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition, 2009
... V. Valdivia, A. Barrado, A. Lázaro, P. Zumel, C. Raga ... Keywords Behavioral Modeling, Non... more ... V. Valdivia, A. Barrado, A. Lázaro, P. Zumel, C. Raga ... Keywords Behavioral Modeling, Nonlinear Modeling, Black Box Modeling, Grey Box Modeling, Voltage Controlled, Buck Derived, Buck, Forward, Push Pull, Full Bridge, Half Bridge, Identification ...