EPE Association: EPE-PEMC 2002: Special Session: State of the Art of Switching Power Conversion

EPE-PEMC 2002: Special Session: State of the Art of Switching Power Conversion
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2002 - Conference > EPE-PEMC 2002: Special Session: State of the Art of Switching Power Conversion

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   An overview of MPPT controls and their future developments
By B. Estibals; H. Valderrama-Blavi; C. Alonso [View]
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Abstract: The main objective of this paper is to present different types of Maximum Power Point Tracking (MPPT) Controls dedicated to new energy productions. After presenting basic concepts of this type of systems, an overview of different MPPT is done. Following this comparison, main criteria to build an improved MPPT are extracted in the way of building an improved power conversion chain. Finally, a new analogical solution is proposed.

   Control and Small-Signal Modelling of Resonant Link Converter
By M. Milanovic; R. Kovacic [View]
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Abstract: The conventional small signal modeling techniques as are state space averaging and injectingabsorbed current method are not appropriate for using in converters based on high frequency resonant link (HFRL). The mentioned methods are appropriate for processes where the pwm switching frequency is constant. Because the operation frequency of the HFRL converters is load dependent the other way of modeling must be used. In this paper a small-signal model of the HFRL converter, operating with a variable resonant link frequency, is developed by using of the estimator for linear system (ELIS) which exists under MATLAB. The high frequency resonant link voltage is modulated by the low frequency signal. The Levenberg-Marguardt method is used for evaluation of the magnitude and phase of the envelope of the high frequency resonant link voltage.

   Design of a Boost Push-Pull Converter with Output Filter
By H. Valderrama; E. Vidal-Idiarte; L. Martínez-Salamero; P. Garcés; J. Calvente [View]
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Abstract: In this work, a boost push-pull converter with output filter and its corresponding controller are designed and simulated. The converter here analyzed is a dc-to-dc voltage step-up converter of high efficiency that has been previously used as battery discharge regulator. Magnetic coupling of input and output inductors and the insertion of an R-C network in parallel with the intermediate capacitor eliminate the right half plane zeros and facilitate the regulation. First, using a hysteresis comparator, a two-loop control processing output current and output voltage is designed. Criteria for the regulator design and expressions for calculating the main system parameters are given. Secondly, a control system using a PWM at constant switching frequency is designed with the same regulator characteristics than in the first case. In the second approach, the possible saturation of the transformer core is considered and prevented by inserting an inner control loop of the push-pull current.

   Design of Power Converters for New Low Power Applications
By C. Alonso; B. Estibals [View]
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Abstract: A design methodology dedicated to low switching power converters is presented in this paper. As new specifications have to be taken into account, new technological problem must be resolved. We propose a new approach mainly based on recent Microsystem technology advances and its dedicated simulation tools. Our purpose is illustrated through the design and realization of passive storage element like an inductor, which constitutes actually the most difficult element to be realized in integrated technology.

   Sliding Mode Design of Distributed Circular Chain Control Strategy for Parallel- Connected Inverters
By E. Fossas; F. Guinjoan; R. Ramos; D. Biel [View]
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Abstract: This work presents the design of a Circular Chain Control (CCC or 3C) sliding-mode control scheme for a modular inverter system composed by N parallel-connected Buck-based single inverters. AC output voltage regulation and balanced current-sharing among the single inverters is achieved by means of a set of switching surfaces and the corresponding sliding control laws. On the other hand, a set of design restrictions is established in terms of the inverter parameters and the AC output signal amplitude and frequency, this facilitating the subsequent design procedure. Simulation and experimental results for three parallel-connected inverters are provided to illustrate the application of the method.

EPE-PEMC 2002: Special Session: State of the Art of Switching Power Conversion
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2002 - Conference > EPE-PEMC 2002: Special Session: State of the Art of Switching Power Conversion
	[return to parent folder]

	An overview of MPPT controls and their future developments By B. Estibals; H. Valderrama-Blavi; C. Alonso	[View] [Download]
Abstract: The main objective of this paper is to present different types of Maximum Power Point Tracking (MPPT) Controls dedicated to new energy productions. After presenting basic concepts of this type of systems, an overview of different MPPT is done. Following this comparison, main criteria to build an improved MPPT are extracted in the way of building an improved power conversion chain. Finally, a new analogical solution is proposed.

	Control and Small-Signal Modelling of Resonant Link Converter By M. Milanovic; R. Kovacic	[View] [Download]
Abstract: The conventional small signal modeling techniques as are state space averaging and injectingabsorbed current method are not appropriate for using in converters based on high frequency resonant link (HFRL). The mentioned methods are appropriate for processes where the pwm switching frequency is constant. Because the operation frequency of the HFRL converters is load dependent the other way of modeling must be used. In this paper a small-signal model of the HFRL converter, operating with a variable resonant link frequency, is developed by using of the estimator for linear system (ELIS) which exists under MATLAB. The high frequency resonant link voltage is modulated by the low frequency signal. The Levenberg-Marguardt method is used for evaluation of the magnitude and phase of the envelope of the high frequency resonant link voltage.

	Design of a Boost Push-Pull Converter with Output Filter By H. Valderrama; E. Vidal-Idiarte; L. Martínez-Salamero; P. Garcés; J. Calvente	[View] [Download]
Abstract: In this work, a boost push-pull converter with output filter and its corresponding controller are designed and simulated. The converter here analyzed is a dc-to-dc voltage step-up converter of high efficiency that has been previously used as battery discharge regulator. Magnetic coupling of input and output inductors and the insertion of an R-C network in parallel with the intermediate capacitor eliminate the right half plane zeros and facilitate the regulation. First, using a hysteresis comparator, a two-loop control processing output current and output voltage is designed. Criteria for the regulator design and expressions for calculating the main system parameters are given. Secondly, a control system using a PWM at constant switching frequency is designed with the same regulator characteristics than in the first case. In the second approach, the possible saturation of the transformer core is considered and prevented by inserting an inner control loop of the push-pull current.

	Design of Power Converters for New Low Power Applications By C. Alonso; B. Estibals	[View] [Download]
Abstract: A design methodology dedicated to low switching power converters is presented in this paper. As new specifications have to be taken into account, new technological problem must be resolved. We propose a new approach mainly based on recent Microsystem technology advances and its dedicated simulation tools. Our purpose is illustrated through the design and realization of passive storage element like an inductor, which constitutes actually the most difficult element to be realized in integrated technology.

	Sliding Mode Design of Distributed Circular Chain Control Strategy for Parallel- Connected Inverters By E. Fossas; F. Guinjoan; R. Ramos; D. Biel	[View] [Download]
Abstract: This work presents the design of a Circular Chain Control (CCC or 3C) sliding-mode control scheme for a modular inverter system composed by N parallel-connected Buck-based single inverters. AC output voltage regulation and balanced current-sharing among the single inverters is achieved by means of a set of switching surfaces and the corresponding sliding control laws. On the other hand, a set of design restrictions is established in terms of the inverter parameters and the AC output signal amplitude and frequency, this facilitating the subsequent design procedure. Simulation and experimental results for three parallel-connected inverters are provided to illustrate the application of the method.