EPE Association: EPE 1999 - Topic 03f: Modelling and Simulation, User Application Experiences

EPE 1999 - Topic 03f: Modelling and Simulation, User Application Experiences
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1999 - Conference > EPE 1999 - Topic 03: POWER SUPPLIES > EPE 1999 - Topic 03f: Modelling and Simulation, User Application Experiences

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   A Generalised Method to Obtain Large and Small-signal Equivalent Circuits of Resonant Inverters and Converters
By J.M. Espí; E. Dede; E. Maset; D. Ramírez; E. Navarro [View]
[Download]

Abstract: This article presents a generalised method to obtain large-signal equivalent circuits of resonant inverters or converters, independently of their order. These circuits can be implemented and simulated to reveal the static and dynamic characteristics of the resonant circuit. DCtransfer ratios, large-signal transients or smallsignal frequency responses against variations of the switching frequency or duty-cycle can be obtained. Closed-loop simulations can be used for control circuit validation and improvement. Moreover, introduction of perturbations into the large-signal circuits leads to the corresponding small-signal circuits.

   Design and Modelling of a Five-Phase Voltage-Source Inverter for ...
By B. François; A. Bouscayrol [View]
[Download]

Abstract: This paper presents a five-phase power inverter to supply two induction motors. The power structure is based on parallel connections of elementary commutation cells. A particular modelling highlights a particular PWM strategy, which consists of separating the modulation period for creating two independent modulated voltage systems. Switching patterns are deduced and an independent speed control of both machines is presented.

   Evaluation of thermal and electrical behaviour of fuses in case of paralleling and/or high frequencies
By D. Tournier; J.L. Gelet; F. Sarrus; J.F. de Palma [View]
[Download]

Abstract: The calculation of the right fuse for a power semiconductor equipment is requiring more and more sophisticated calculation and simulation. Due to new semiconductors like IGBT/IGCT fuses are undergoing high current duty cycle, high frequency and end users are requiring longer fuses life time and lower I²t. In order to face this new request and to understand how the fuse behaves under high duty cycle and/or high frequency, we have developed a method to evaluate thermal and electrical behavior of fuses in parallel and/or subject to high frequencies. This method consists in a coupling between two simple models for fuse and its surrounding. First is thermal model, including thermal resistance, capacitances and generators. This model allows to take into account fuse itself and also its connections, heat generated by semiconductor, and surrounding. The parameters for the thermal characteristics of the fuse have been expressed in a very simple way. Second is a simulation of the circuit, using HOER and LOWE’s formula [1] in order to evaluate resistance, self and mutual inductances for each component of the circuit. A so-called InCa software [2] is used in this way. Finally both models are coupled in a solversoftware which gives temperature of each component and current in each conductor. These results are used for the fuse determination, in addition of consideration of I²t for protection and duty-cycles for life-duration. An example of modellisation will be presented and also how is was used for customer application.

   On Modulator Influence on Chaotic Behaviours in a PWM-bridge
By B. Robert; D. Carton; C. Goeldel [View]
[Download]

Abstract: This paper deals with theory of chaos applied to a power stage. A current mode PWM H-bridge supplies a load modelled by a R-L circuit. A recurrent model is proposed for studying stability of the current loop. Feigenbaum’s diagrams and Lyapunov exponents are used in order to show the influence of the modulation technique on the emergence of chaotic and sub-harmonic running modes.

   Power Factor & Dynamics Analysis of PFC Converter for High Perfom...
By H-R. Choi; H-S. Mok; G-H. Choe; J-Y. Choi; C. Y. Won; K.S. Kim [View]
[Download]

Abstract: An inverter arc welding machine applying single switch PFC converter is presented in this paper. First, the basic operation and priciple is reviewed. Controller design is intended to force voltage ripple to minimize, and dynamic response to enhance. Feed-forward scheme for arc welding machine is developted, and that is verified by simulation. The improved power factor characteristics of inverter arc welding machine with nonlinear load property, are shown and evaluated compared to conventional one by experiment.

   Simulation of Phase-Shift controlled Six-Pulse Converters Based on Switching Vector
By J. Kyyra [View]
[Download]

Abstract: In the paper an efficient simulation method for three-phase bridge converters is presented. It is based on switching vector, which describes the state of the conducting power components in the converter with a space-vector of switching functions. In the beginning supply inductance is assumed to be zero but later the effect of supply inductance in commutation is also taken into account. In addition to a line-commutated ac-dc rectifier also three-phase to single-phase ac-ac conversion is discussed. Simulated results are compared with measured ones.

   State-Variable Equation Based Simulation Technique for Power Electronic Converter Circuit and Systems
By S. Mobin; M. Nakaoka; H. Takano [View]
[Download]

Abstract: This paper describes application example of a digital signal processor (DSP) controlled single-phase power factor correction (PFC) converter system using a new efficient simulation approach. This power electronic circuit simulation technique consists of a circuit equation modelled by substituting time varying switched resistor circuit in place of all the active and passive power semiconductor switches incorporated in the bridge legs of power converter circuit. An algebraic algorithm computation method transforms the matrices of the circuit equation into matrices of the state vector equation. One state-vector equation describes state-variables; inductor currents and capacitor voltages. In this approach, software code of control function used in simulation can also be incorporated in the DSP software control based PFC power conversion processing system.

EPE 1999 - Topic 03f: Modelling and Simulation, User Application Experiences
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1999 - Conference > EPE 1999 - Topic 03: POWER SUPPLIES > EPE 1999 - Topic 03f: Modelling and Simulation, User Application Experiences
	[return to parent folder]

	A Generalised Method to Obtain Large and Small-signal Equivalent Circuits of Resonant Inverters and Converters By J.M. Espí; E. Dede; E. Maset; D. Ramírez; E. Navarro	[View] [Download]
Abstract: This article presents a generalised method to obtain large-signal equivalent circuits of resonant inverters or converters, independently of their order. These circuits can be implemented and simulated to reveal the static and dynamic characteristics of the resonant circuit. DCtransfer ratios, large-signal transients or smallsignal frequency responses against variations of the switching frequency or duty-cycle can be obtained. Closed-loop simulations can be used for control circuit validation and improvement. Moreover, introduction of perturbations into the large-signal circuits leads to the corresponding small-signal circuits.

	Design and Modelling of a Five-Phase Voltage-Source Inverter for ... By B. François; A. Bouscayrol	[View] [Download]
Abstract: This paper presents a five-phase power inverter to supply two induction motors. The power structure is based on parallel connections of elementary commutation cells. A particular modelling highlights a particular PWM strategy, which consists of separating the modulation period for creating two independent modulated voltage systems. Switching patterns are deduced and an independent speed control of both machines is presented.

	Evaluation of thermal and electrical behaviour of fuses in case of paralleling and/or high frequencies By D. Tournier; J.L. Gelet; F. Sarrus; J.F. de Palma	[View] [Download]
Abstract: The calculation of the right fuse for a power semiconductor equipment is requiring more and more sophisticated calculation and simulation. Due to new semiconductors like IGBT/IGCT fuses are undergoing high current duty cycle, high frequency and end users are requiring longer fuses life time and lower I²t. In order to face this new request and to understand how the fuse behaves under high duty cycle and/or high frequency, we have developed a method to evaluate thermal and electrical behavior of fuses in parallel and/or subject to high frequencies. This method consists in a coupling between two simple models for fuse and its surrounding. First is thermal model, including thermal resistance, capacitances and generators. This model allows to take into account fuse itself and also its connections, heat generated by semiconductor, and surrounding. The parameters for the thermal characteristics of the fuse have been expressed in a very simple way. Second is a simulation of the circuit, using HOER and LOWE’s formula [1] in order to evaluate resistance, self and mutual inductances for each component of the circuit. A so-called InCa software [2] is used in this way. Finally both models are coupled in a solversoftware which gives temperature of each component and current in each conductor. These results are used for the fuse determination, in addition of consideration of I²t for protection and duty-cycles for life-duration. An example of modellisation will be presented and also how is was used for customer application.

	On Modulator Influence on Chaotic Behaviours in a PWM-bridge By B. Robert; D. Carton; C. Goeldel	[View] [Download]
Abstract: This paper deals with theory of chaos applied to a power stage. A current mode PWM H-bridge supplies a load modelled by a R-L circuit. A recurrent model is proposed for studying stability of the current loop. Feigenbaum’s diagrams and Lyapunov exponents are used in order to show the influence of the modulation technique on the emergence of chaotic and sub-harmonic running modes.

	Power Factor & Dynamics Analysis of PFC Converter for High Perfom... By H-R. Choi; H-S. Mok; G-H. Choe; J-Y. Choi; C. Y. Won; K.S. Kim	[View] [Download]
Abstract: An inverter arc welding machine applying single switch PFC converter is presented in this paper. First, the basic operation and priciple is reviewed. Controller design is intended to force voltage ripple to minimize, and dynamic response to enhance. Feed-forward scheme for arc welding machine is developted, and that is verified by simulation. The improved power factor characteristics of inverter arc welding machine with nonlinear load property, are shown and evaluated compared to conventional one by experiment.

	Simulation of Phase-Shift controlled Six-Pulse Converters Based on Switching Vector By J. Kyyra	[View] [Download]
Abstract: In the paper an efficient simulation method for three-phase bridge converters is presented. It is based on switching vector, which describes the state of the conducting power components in the converter with a space-vector of switching functions. In the beginning supply inductance is assumed to be zero but later the effect of supply inductance in commutation is also taken into account. In addition to a line-commutated ac-dc rectifier also three-phase to single-phase ac-ac conversion is discussed. Simulated results are compared with measured ones.

	State-Variable Equation Based Simulation Technique for Power Electronic Converter Circuit and Systems By S. Mobin; M. Nakaoka; H. Takano	[View] [Download]
Abstract: This paper describes application example of a digital signal processor (DSP) controlled single-phase power factor correction (PFC) converter system using a new efficient simulation approach. This power electronic circuit simulation technique consists of a circuit equation modelled by substituting time varying switched resistor circuit in place of all the active and passive power semiconductor switches incorporated in the bridge legs of power converter circuit. An algebraic algorithm computation method transforms the matrices of the circuit equation into matrices of the state vector equation. One state-vector equation describes state-variables; inductor currents and capacitor voltages. In this approach, software code of control function used in simulation can also be incorporated in the DSP software control based PFC power conversion processing system.