S. Sriprang, B. Nahid-Mobarakeh, S. Pierfederici, N. Takorabet, N. Bizon, P. Kumam and P. Thounth... more S. Sriprang, B. Nahid-Mobarakeh, S. Pierfederici, N. Takorabet, N. Bizon, P. Kumam and P. Thounthong 1GREEN Lab., Universite de Lorraine, 2 Vancouver-Ies-Nancy, Lorraine 54516, France 2Renewable Energy Research Centre (RERC), Thai-French Innovation Institute (TFII) 3Department of Teacher Training in Electrical Engineering (TE), Faculty of Technical Education King Mongkut's University of Technology North Bangkok, 1518, Pracharat 1 Rd., Bangkok 10800, Thailand *e-mail: songklod.sri@rmutr.ac.th 4Department of Mathematics, King Mongkut's University of Technology Thonburi, Bangkok, Thailand 5Faculty of Electronics, Communications and Computers, University of Pitesti, Arges 110040, Pitesti, Romania
ABSTRACT This paper presents a flatness based method to control a non-ideal DC/DC boost converter... more ABSTRACT This paper presents a flatness based method to control a non-ideal DC/DC boost converter. An online trajectory planning algorithm is used to control the total energy stored in the system. The trajectory is planed thanks to polynomial form which is valid on a finite horizon. This method is applied at first to an ideal DC/DC boost converter. Then, an online estimator is used to track the evolution of the converter losses and the load variations and therefore, a more realistic model is developed for a non-ideal converter. The applied control strategy is finally adapted to the completed converter model. Therefore, a high dynamic nonlinear control is deduced for a non-ideal DC/DC boost converter. The experimental results prove validity of the control method and the system losses estimator.
It is common in embedded systems to have small LC filters connected to constant power loads, know... more It is common in embedded systems to have small LC filters connected to constant power loads, known to produce instabilities. In order to help the stabilization of the system without increasing its weight and volume, a new control scheme is studied, based on a sliding mode controller. The studied system is composed of a DC-DC boost converter with the modified command, an LC filter and a constant power load. The modeling of this system is done with two sample time: one for the command –the same as switching period- and another much smaller one for the discretization of the continuous state variables of the power stage. This is necessary in order to take into account the switching effect as well as non-linear terms. This model allows studying the stability of the system. Simulation and experimental results are given to validate the modified command.
ABSTRACT In this paper, a global study in terms of control architecture and power management is a... more ABSTRACT In this paper, a global study in terms of control architecture and power management is applied to parallel inverters topology. High bandwidth controllers and low voltage THD are achieved. The losses through the structure are modeled by equivalent voltage sources which implicitly represent all the losses types in the system. An accurate online estimation method allows determining these losses parameters. Then, a new power sharing is defined aiming to maximize the global efficiency of the overall structure. The algorithm is theoretically analyzed with the proposed control and estimation method.
PESC Record - IEEE Annual Power Electronics Specialists Conference, 2008
In this paper, a non-isolated DC-DC converter with high voltage ratio is proposed for power sourc... more In this paper, a non-isolated DC-DC converter with high voltage ratio is proposed for power source like fuel cell. To take into account the low voltage - high density characteristics of power sources, a cascaded structure composed by two sub-converters in cascade has been chosen and allows obtaining a high voltage ratio. The choices of each sub-converter are based on
Conference Record - IAS Annual Meeting (IEEE Industry Applications Society), 2009
ABSTRACT The objective of this paper is to present an analytical method allowing large signal sta... more ABSTRACT The objective of this paper is to present an analytical method allowing large signal stability analysis of an electric system constituted by a DC power supply and its output filter connected to a constant power load. Here, the load is realized by a voltage source inverter motor mechanical load actuator system. We suppose that proper controllers are used to drive the actuator. Then, a large signal stability analysis is given for studying the dc-link voltage behavior under large unknown disturbances. This study is based on the Takagi-Sugeno theorem which generates a Lyapunov function allowing the determination of a domain of attraction for a given operating point. This approach may be applied either to estimate robustness properties of a controlled drive system or to be used as a design tool for the dc-link capacitance value. Simulations and experimentations confirm the validity of the proposed approach.
In this paper, a transformer for an N-port isolated bidirectional DC-DC converter is presented. T... more In this paper, a transformer for an N-port isolated bidirectional DC-DC converter is presented. This converter can be used in hybrid renewable energy systems where many of energy sources and storage devices and load are required. The final model allows simple calculation of the exchanged power between ports. The example of three-winding transformer for a three-port DC-DC converter is realized. The proposed method was verified experimentally. Finally, this transformer was used in a hybrid energy source where the main energy source was a fuel cell coupled with a storage device (a bank of supercapacitor).
8th Power Plant and Power System Control Symposium, 2012
ABSTRACT Employing fuel cell as main source requires increasing and regulating its output voltage... more ABSTRACT Employing fuel cell as main source requires increasing and regulating its output voltage. In this paper, flatness based controllers for a hybrid source system, which contains fuel cell (FC) and supercapacitor (SC), are presented. Nonisolated DC/DC converters are used for achieving the hybrid power source and evaluating the performances of the flatness based controllers. The FC is used as the main power source. The SC is employed as auxiliary source to deal with the slow transient response of FC. The limitation of FC current changing rate is taken into account. The hybrid source including the proposed controller is validated by experimental results. Controls of the whole systems are realized by energetic trajectories planning based on flatness properties of the systems.
In this paper, a non-isolated DC-DC converter with high voltage ratio is proposed for power sourc... more In this paper, a non-isolated DC-DC converter with high voltage ratio is proposed for power source like fuel cell. To take into account the low voltage - high density characteristics of power sources, a cascaded structure composed by two sub-converters in cascade has been chosen and allows obtaining a high voltage ratio. The choices of each sub-converter are based on
S. Sriprang, B. Nahid-Mobarakeh, S. Pierfederici, N. Takorabet, N. Bizon, P. Kumam and P. Thounth... more S. Sriprang, B. Nahid-Mobarakeh, S. Pierfederici, N. Takorabet, N. Bizon, P. Kumam and P. Thounthong 1GREEN Lab., Universite de Lorraine, 2 Vancouver-Ies-Nancy, Lorraine 54516, France 2Renewable Energy Research Centre (RERC), Thai-French Innovation Institute (TFII) 3Department of Teacher Training in Electrical Engineering (TE), Faculty of Technical Education King Mongkut's University of Technology North Bangkok, 1518, Pracharat 1 Rd., Bangkok 10800, Thailand *e-mail: songklod.sri@rmutr.ac.th 4Department of Mathematics, King Mongkut's University of Technology Thonburi, Bangkok, Thailand 5Faculty of Electronics, Communications and Computers, University of Pitesti, Arges 110040, Pitesti, Romania
ABSTRACT This paper presents a flatness based method to control a non-ideal DC/DC boost converter... more ABSTRACT This paper presents a flatness based method to control a non-ideal DC/DC boost converter. An online trajectory planning algorithm is used to control the total energy stored in the system. The trajectory is planed thanks to polynomial form which is valid on a finite horizon. This method is applied at first to an ideal DC/DC boost converter. Then, an online estimator is used to track the evolution of the converter losses and the load variations and therefore, a more realistic model is developed for a non-ideal converter. The applied control strategy is finally adapted to the completed converter model. Therefore, a high dynamic nonlinear control is deduced for a non-ideal DC/DC boost converter. The experimental results prove validity of the control method and the system losses estimator.
It is common in embedded systems to have small LC filters connected to constant power loads, know... more It is common in embedded systems to have small LC filters connected to constant power loads, known to produce instabilities. In order to help the stabilization of the system without increasing its weight and volume, a new control scheme is studied, based on a sliding mode controller. The studied system is composed of a DC-DC boost converter with the modified command, an LC filter and a constant power load. The modeling of this system is done with two sample time: one for the command –the same as switching period- and another much smaller one for the discretization of the continuous state variables of the power stage. This is necessary in order to take into account the switching effect as well as non-linear terms. This model allows studying the stability of the system. Simulation and experimental results are given to validate the modified command.
ABSTRACT In this paper, a global study in terms of control architecture and power management is a... more ABSTRACT In this paper, a global study in terms of control architecture and power management is applied to parallel inverters topology. High bandwidth controllers and low voltage THD are achieved. The losses through the structure are modeled by equivalent voltage sources which implicitly represent all the losses types in the system. An accurate online estimation method allows determining these losses parameters. Then, a new power sharing is defined aiming to maximize the global efficiency of the overall structure. The algorithm is theoretically analyzed with the proposed control and estimation method.
PESC Record - IEEE Annual Power Electronics Specialists Conference, 2008
In this paper, a non-isolated DC-DC converter with high voltage ratio is proposed for power sourc... more In this paper, a non-isolated DC-DC converter with high voltage ratio is proposed for power source like fuel cell. To take into account the low voltage - high density characteristics of power sources, a cascaded structure composed by two sub-converters in cascade has been chosen and allows obtaining a high voltage ratio. The choices of each sub-converter are based on
Conference Record - IAS Annual Meeting (IEEE Industry Applications Society), 2009
ABSTRACT The objective of this paper is to present an analytical method allowing large signal sta... more ABSTRACT The objective of this paper is to present an analytical method allowing large signal stability analysis of an electric system constituted by a DC power supply and its output filter connected to a constant power load. Here, the load is realized by a voltage source inverter motor mechanical load actuator system. We suppose that proper controllers are used to drive the actuator. Then, a large signal stability analysis is given for studying the dc-link voltage behavior under large unknown disturbances. This study is based on the Takagi-Sugeno theorem which generates a Lyapunov function allowing the determination of a domain of attraction for a given operating point. This approach may be applied either to estimate robustness properties of a controlled drive system or to be used as a design tool for the dc-link capacitance value. Simulations and experimentations confirm the validity of the proposed approach.
In this paper, a transformer for an N-port isolated bidirectional DC-DC converter is presented. T... more In this paper, a transformer for an N-port isolated bidirectional DC-DC converter is presented. This converter can be used in hybrid renewable energy systems where many of energy sources and storage devices and load are required. The final model allows simple calculation of the exchanged power between ports. The example of three-winding transformer for a three-port DC-DC converter is realized. The proposed method was verified experimentally. Finally, this transformer was used in a hybrid energy source where the main energy source was a fuel cell coupled with a storage device (a bank of supercapacitor).
8th Power Plant and Power System Control Symposium, 2012
ABSTRACT Employing fuel cell as main source requires increasing and regulating its output voltage... more ABSTRACT Employing fuel cell as main source requires increasing and regulating its output voltage. In this paper, flatness based controllers for a hybrid source system, which contains fuel cell (FC) and supercapacitor (SC), are presented. Nonisolated DC/DC converters are used for achieving the hybrid power source and evaluating the performances of the flatness based controllers. The FC is used as the main power source. The SC is employed as auxiliary source to deal with the slow transient response of FC. The limitation of FC current changing rate is taken into account. The hybrid source including the proposed controller is validated by experimental results. Controls of the whole systems are realized by energetic trajectories planning based on flatness properties of the systems.
In this paper, a non-isolated DC-DC converter with high voltage ratio is proposed for power sourc... more In this paper, a non-isolated DC-DC converter with high voltage ratio is proposed for power source like fuel cell. To take into account the low voltage - high density characteristics of power sources, a cascaded structure composed by two sub-converters in cascade has been chosen and allows obtaining a high voltage ratio. The choices of each sub-converter are based on
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