EPE Association: EPE-PEMC 2004 - Topic 02-7: Modelling and simulation of converters

EPE-PEMC 2004 - Topic 02-7: Modelling and simulation of converters
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2004 - Conference > EPE-PEMC 2004 - Topic 02: POWER ELECTRONICS CONVERTERS > EPE-PEMC 2004 - Topic 02-7: Modelling and simulation of converters

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   A New Mathematical Model For Analysing 3-Phase Controlled Rectifier Using Switching Functions
By Christos C. Marouchos(cy), M. K. Darwish(uk) [View]
[Download]

Abstract: A fast, accurate, and effective mathematical model for analysing 3-phase fullwave controlled rectifier is presented in this paper. The mathematical model is based on the derivation of an appropriate set of switching functions. Once the switching functions are derived, the output current, input current, output dc voltage, displacement power factor, total harmonic distortion, distortion factor, and the frequency spectrum of the input current can all be easily derived and generated from the application of this technique. This method can also be applied to other types of converters.

   A Refined DC/DC Two-Quadrant Converter Model For Conduction Losses Evaluation
By M. Marchesoni, C. Vacca [View]
[Download]

Abstract: A refined model for the evaluation of the conduction power losses in two-quadrant dc/dc power converters, based on the Averaged Switch Modeling theory, has been developed. The analytical development and some test results, that confirm the validity of the proposed approach, are shown.

   A Simple Active Single Capacitor Single Inductor Snubber For Inverter Circuits
By Ceglia Gerardo, Victor Guzman, Maria Isabel G. De Guzman, Carlos Sanchez, Fernando IbaÑez [View]
[Download]

Abstract: A family of Single Capacitor Single Inductor Active Snubber (SCSIAS) circuits for inverters is presented, having minimum component count. The SCSIAS configuration ensures that the main power devices undergo a ZVS off-commutation and a ZCS on-commutation, minimizing commutation losses in all operating conditions. Snubber topology also ensures that most auxiliary commutations take place under zero voltage/zero current conditions. Four active auxiliary switch configurations are possible, with two operation strategies: one with minimum control action and one with snubber energy recovery. Simulation results are presented; work in the laboratory prototype is continuing.

   A Simple And Accurate Tool To Calculate The Spectra Of The Output Electrical Variables Of Dc-Ac Resonant And Soft -Switching Converters
By Beatriz Vieira Borges [View]
[Download]

Abstract: This paper describes and demonstrates a general result useful to calculate the harmonic content of the output voltag e (or current) in soft switching discrete pulse modulated converters. The application of this result enables the spectral analyses of a pulsed modulated voltage waveform based on the calculation of the harmonic content of the correspondent hard switching converter and may be applied to two or three level, one pulse or multiple pulse modulation.

   Iterative Procedure To Determine The Steady-State Behaviour Of Power Systems Including Static Converters
By Armando Bellini, Stefano Bifaretti, Stefano Costantini [View]
[Download]

Abstract: The paper presents the iterative procedure employed by simulation program APoSIS to calculate the steady-state behaviour of power converter based systems. APoSIS (Advanced Power System Interactive Simulator) is an interactive program, developed for 32-bit Windows operating system platforms, useful to analyze the steady-state behaviour of power systems including static converters. After the definition of the power system structure and the values of its parameters by means of a netlist description, APoSIS allows at first the determination of the steady-state values of the system state variables at a prefixed initial instant; successively, the program can calculate several functions characterizing the steady-state behaviour, such as the mean value and the harmonic coefficients of the most significant variables. In addition, APoSIS can also analyzes the stability of the power system and calculates the dynamic evolution produced by a disturbance or a parametric variation. After a short recall to the structure of APoSIS, the paper explains the iterative procedure adopted to determine the steadystate values of the state variables, at a prefixed initial instant, and the timings when some commutation instants depend on the system operating conditions. Finally, the approach employed for the computation of the mean value and the harmonic coefficients of the most significant variables is presented.

   Mathematical Model Of The Ac Chopper Operating Under Line Voltage Unbalance. Concept Of Control Method Based On Instantaneous Power Observation
By Korotyeyev Igor, Kasperek Radoslaw [View]
[Download]

Abstract: The goal of this paper is to present new concept of control method of an AC chopper that enables to eliminate inactive components from the load voltage (or current). Principles of operation are illustrated on instance of line voltage unbalance. It is assumed that the load is stationary. Pulsation of instantaneous power is used as the feedback signal. The chopper is controlled as an active filter, so only the basic harmonics of the voltage is delivered to the load. The mathematical model of analyzed AC line conditioning circuit is established, its correctness is confirmed by PSpice simulation tests. Moreover, stability of that closed loop control system is examined.

   Modeling And Simulation Of A Three-Phase Cycloconverter For Input Unbalance Correction
By M. G. Hosseini Aghdam, M. Abedi, S. M. Kouhsari [View]
[Download]

Abstract: Cycloconverters are converter structures capable of providing simultaneous voltage and frequency transformation without the need of intermediate stage reactive components. Consequently, they are well-suited for high-power density variable-frequency applications. Cycloconverters are designed to work under balanced input condition. The three phase power frequency input voltage of static converters may be unbalanced either in amplitude or in phase. This paper discusses a novel technique to produce the output of the converter balanced when the input is amplitude unbalanced. Analytically predicted results are verified by simulation.

   Modeling And Simulation Of The Short-Circuit Phenomena In The Energy Conversion Structures
By E Elwarraki, A. Sabir, M. Jellouli, A. Bennis, A. Saad [View]
[Download]

Abstract: At present the modeling and the simulation of the semiconductor devices became an essential help tool in the power electronics field. Several models have been developed recently are appropriate to the physicists of the semiconductors and are dedicated to the internal behavioral modeling of these devices. On the other hand, as users one we are interested only in their electric behavior. Indeed, the insertion of these devices in a circuit environment necessitates enough often to find models from passive elements and that reproduce the same electrical behaviour in order to solve the problems mentioned in the circuits design. For these last objectives we have to develop behavioral models of diodes, bipolar transistors and IGBTs and we gave several simulation results [5,6], these results were satisfactory. In this article, we are interested in modeling and with the simulation of the short-circuit phenomena in the energy conversion structures, based on IGBTs, which are often subjected to disturbances from various origins, these disturbances often cause short-circuit which cause in more the share of the cases the destruction of one or several semiconductor devices if no suitable protection is provided. To envisage this destruction and to consider an appropriate protection by user, previous simulations of these structures prove to be necessary.

   Nonlinear Modelling Of Multi-Phase Pwm Power Converters
By Andres Nogueiras, Alfonso Lago, Jesus Doval, Jorge Marcos, Carlos Martinez-Penalver [View]
[Download]

Abstract: The non linear PWM model, based on the Heaviside unitary pulse, is the rst stepping stone of a modular simulation library. It was developed to help design and simulation of PWM xed frequency power converters. The converters topology are dened by means of matrices of the space-space, obtained employing symbolic math, and simulated using MATLAB scripts and SIMULINK blocks. It is also usefull to model and simulate paralelled dc-to-dc converters.

   Simulation And Analyses Of Matrix Converter Circuits
By Adrian Popovici, Viorel Popescu, [View]
[Download]

Abstract: In this paper a behavior mode simulation and a computer aided analysis for matrix converter is presented. The analysis approach is based on output/input waveforms harmonic analysis and qualitative analysis of the switching losses. Thus by using an optimal control algorithm for matrix converter it is possible to find a compromise between output/input waveforms and switching losses for a particular application. Also it is possible a design approach for input filter matrix converter.

   Simulation And Implementation Of Control Strategy For Matrix Converters Using Simulink Software Package
By Adrian Popovici, Viorel Popescu [View]
[Download]

Abstract: This paper describes the implementation of scalar line to line voltages modulation (SLM) control system for matrix converters, using SIMULINK software package and a dSPACE module. The control scheme is characterized by a real time calculation of switch on/off intervals. To verify the validity of the proposed modulator, the output voltage waveforms generated by a low signal matrix converter are shown in association with theoretical synthesized waveforms.

   Steady -State Periodic Analysis Of A Power Electronic Circuit By A Quasi-Newton Method
By Toshiji Kato, Kaoru Inoue [View]
[Download]

Abstract: I t of ten t ak e s a l ong C PU time to get steadystate wavefor ms in a power el ectronic circ ui t. It is effi cien t and desirable to get such waveforms directly without unnecessary transient analysis. Steady-state periodic analysis is efficient by giving appropriate initial values directly which satisfy steady-state boundary conditions for inductors and capacitors. The shooting method directly solves the boundary value equations for initial values. However a power electronic circuit has difficulties to be analyzed because it is a mixed system in three meanings. One is that it is mixed with main and control circuits. Another is that it is mixed with analog and digital elements. The other is that it is mixed with electric, mechanical and other physical systems. These makes it difficult to compute its state-transition matrix or the Jacobian for the equations. This paper proposes a modification technique for the the Jacobian evaluation in the shooting method. It is evaluated indirectly and repeatedly not by the Newton method but by the quasi-Newton method. Three examples of power electronic circuits, a series resonant DC-DC converter, a buck DC-DC converter with sliding-mode control, and a benchmark test circuit by the simulation committee of IEEJ, are analyzed and investigated.

   The Consequences Of Aging Of Electrolytic Capacitors, Used In Dc-Dc Converters, Under Steady-State Operating Conditions
By Acacio M. R. Amaral, A. J. Marques Cardoso [View]
[Download]

Abstract: In this paper, a study about the effect of some parasitic elements of switch mode DC-DC converters operating in steadystate regime is presented, as well as an analysis about the consequences of aging of electrolytic capacitors used in the output filter. The aging of electrolytic capacitors, used for smoothing the output voltage manifests by the increase of their equivalent series resistance (ESR), which increases the output voltage ripple. A method for attenuating this effect is proposed. Although the transistor resistance (RS) decrease the efficiency, it can contribute for decreasing the inductor ripple current, which reduces the effect of saturation in the inductor, the stress in the semiconductors, as well as the output voltage ripple. Several theoretical, simulated and experimental results are presented, for a buck type DC-DC converter operating in the continuous conduction mode (CCM).

EPE-PEMC 2004 - Topic 02-7: Modelling and simulation of converters
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2004 - Conference > EPE-PEMC 2004 - Topic 02: POWER ELECTRONICS CONVERTERS > EPE-PEMC 2004 - Topic 02-7: Modelling and simulation of converters
	[return to parent folder]

	A New Mathematical Model For Analysing 3-Phase Controlled Rectifier Using Switching Functions By Christos C. Marouchos(cy), M. K. Darwish(uk)	[View] [Download]
Abstract: A fast, accurate, and effective mathematical model for analysing 3-phase fullwave controlled rectifier is presented in this paper. The mathematical model is based on the derivation of an appropriate set of switching functions. Once the switching functions are derived, the output current, input current, output dc voltage, displacement power factor, total harmonic distortion, distortion factor, and the frequency spectrum of the input current can all be easily derived and generated from the application of this technique. This method can also be applied to other types of converters.

	A Refined DC/DC Two-Quadrant Converter Model For Conduction Losses Evaluation By M. Marchesoni, C. Vacca	[View] [Download]
Abstract: A refined model for the evaluation of the conduction power losses in two-quadrant dc/dc power converters, based on the Averaged Switch Modeling theory, has been developed. The analytical development and some test results, that confirm the validity of the proposed approach, are shown.

	A Simple Active Single Capacitor Single Inductor Snubber For Inverter Circuits By Ceglia Gerardo, Victor Guzman, Maria Isabel G. De Guzman, Carlos Sanchez, Fernando IbaÑez	[View] [Download]
Abstract: A family of Single Capacitor Single Inductor Active Snubber (SCSIAS) circuits for inverters is presented, having minimum component count. The SCSIAS configuration ensures that the main power devices undergo a ZVS off-commutation and a ZCS on-commutation, minimizing commutation losses in all operating conditions. Snubber topology also ensures that most auxiliary commutations take place under zero voltage/zero current conditions. Four active auxiliary switch configurations are possible, with two operation strategies: one with minimum control action and one with snubber energy recovery. Simulation results are presented; work in the laboratory prototype is continuing.

	A Simple And Accurate Tool To Calculate The Spectra Of The Output Electrical Variables Of Dc-Ac Resonant And Soft -Switching Converters By Beatriz Vieira Borges	[View] [Download]
Abstract: This paper describes and demonstrates a general result useful to calculate the harmonic content of the output voltag e (or current) in soft switching discrete pulse modulated converters. The application of this result enables the spectral analyses of a pulsed modulated voltage waveform based on the calculation of the harmonic content of the correspondent hard switching converter and may be applied to two or three level, one pulse or multiple pulse modulation.

	Iterative Procedure To Determine The Steady-State Behaviour Of Power Systems Including Static Converters By Armando Bellini, Stefano Bifaretti, Stefano Costantini	[View] [Download]
Abstract: The paper presents the iterative procedure employed by simulation program APoSIS to calculate the steady-state behaviour of power converter based systems. APoSIS (Advanced Power System Interactive Simulator) is an interactive program, developed for 32-bit Windows operating system platforms, useful to analyze the steady-state behaviour of power systems including static converters. After the definition of the power system structure and the values of its parameters by means of a netlist description, APoSIS allows at first the determination of the steady-state values of the system state variables at a prefixed initial instant; successively, the program can calculate several functions characterizing the steady-state behaviour, such as the mean value and the harmonic coefficients of the most significant variables. In addition, APoSIS can also analyzes the stability of the power system and calculates the dynamic evolution produced by a disturbance or a parametric variation. After a short recall to the structure of APoSIS, the paper explains the iterative procedure adopted to determine the steadystate values of the state variables, at a prefixed initial instant, and the timings when some commutation instants depend on the system operating conditions. Finally, the approach employed for the computation of the mean value and the harmonic coefficients of the most significant variables is presented.

	Mathematical Model Of The Ac Chopper Operating Under Line Voltage Unbalance. Concept Of Control Method Based On Instantaneous Power Observation By Korotyeyev Igor, Kasperek Radoslaw	[View] [Download]
Abstract: The goal of this paper is to present new concept of control method of an AC chopper that enables to eliminate inactive components from the load voltage (or current). Principles of operation are illustrated on instance of line voltage unbalance. It is assumed that the load is stationary. Pulsation of instantaneous power is used as the feedback signal. The chopper is controlled as an active filter, so only the basic harmonics of the voltage is delivered to the load. The mathematical model of analyzed AC line conditioning circuit is established, its correctness is confirmed by PSpice simulation tests. Moreover, stability of that closed loop control system is examined.

	Modeling And Simulation Of A Three-Phase Cycloconverter For Input Unbalance Correction By M. G. Hosseini Aghdam, M. Abedi, S. M. Kouhsari	[View] [Download]
Abstract: Cycloconverters are converter structures capable of providing simultaneous voltage and frequency transformation without the need of intermediate stage reactive components. Consequently, they are well-suited for high-power density variable-frequency applications. Cycloconverters are designed to work under balanced input condition. The three phase power frequency input voltage of static converters may be unbalanced either in amplitude or in phase. This paper discusses a novel technique to produce the output of the converter balanced when the input is amplitude unbalanced. Analytically predicted results are verified by simulation.

	Modeling And Simulation Of The Short-Circuit Phenomena In The Energy Conversion Structures By E Elwarraki, A. Sabir, M. Jellouli, A. Bennis, A. Saad	[View] [Download]
Abstract: At present the modeling and the simulation of the semiconductor devices became an essential help tool in the power electronics field. Several models have been developed recently are appropriate to the physicists of the semiconductors and are dedicated to the internal behavioral modeling of these devices. On the other hand, as users one we are interested only in their electric behavior. Indeed, the insertion of these devices in a circuit environment necessitates enough often to find models from passive elements and that reproduce the same electrical behaviour in order to solve the problems mentioned in the circuits design. For these last objectives we have to develop behavioral models of diodes, bipolar transistors and IGBTs and we gave several simulation results [5,6], these results were satisfactory. In this article, we are interested in modeling and with the simulation of the short-circuit phenomena in the energy conversion structures, based on IGBTs, which are often subjected to disturbances from various origins, these disturbances often cause short-circuit which cause in more the share of the cases the destruction of one or several semiconductor devices if no suitable protection is provided. To envisage this destruction and to consider an appropriate protection by user, previous simulations of these structures prove to be necessary.

	Nonlinear Modelling Of Multi-Phase Pwm Power Converters By Andres Nogueiras, Alfonso Lago, Jesus Doval, Jorge Marcos, Carlos Martinez-Penalver	[View] [Download]
Abstract: The non linear PWM model, based on the Heaviside unitary pulse, is the rst stepping stone of a modular simulation library. It was developed to help design and simulation of PWM xed frequency power converters. The converters topology are dened by means of matrices of the space-space, obtained employing symbolic math, and simulated using MATLAB scripts and SIMULINK blocks. It is also usefull to model and simulate paralelled dc-to-dc converters.

	Simulation And Analyses Of Matrix Converter Circuits By Adrian Popovici, Viorel Popescu,	[View] [Download]
Abstract: In this paper a behavior mode simulation and a computer aided analysis for matrix converter is presented. The analysis approach is based on output/input waveforms harmonic analysis and qualitative analysis of the switching losses. Thus by using an optimal control algorithm for matrix converter it is possible to find a compromise between output/input waveforms and switching losses for a particular application. Also it is possible a design approach for input filter matrix converter.

	Simulation And Implementation Of Control Strategy For Matrix Converters Using Simulink Software Package By Adrian Popovici, Viorel Popescu	[View] [Download]
Abstract: This paper describes the implementation of scalar line to line voltages modulation (SLM) control system for matrix converters, using SIMULINK software package and a dSPACE module. The control scheme is characterized by a real time calculation of switch on/off intervals. To verify the validity of the proposed modulator, the output voltage waveforms generated by a low signal matrix converter are shown in association with theoretical synthesized waveforms.

	Steady -State Periodic Analysis Of A Power Electronic Circuit By A Quasi-Newton Method By Toshiji Kato, Kaoru Inoue	[View] [Download]
Abstract: I t of ten t ak e s a l ong C PU time to get steadystate wavefor ms in a power el ectronic circ ui t. It is effi cien t and desirable to get such waveforms directly without unnecessary transient analysis. Steady-state periodic analysis is efficient by giving appropriate initial values directly which satisfy steady-state boundary conditions for inductors and capacitors. The shooting method directly solves the boundary value equations for initial values. However a power electronic circuit has difficulties to be analyzed because it is a mixed system in three meanings. One is that it is mixed with main and control circuits. Another is that it is mixed with analog and digital elements. The other is that it is mixed with electric, mechanical and other physical systems. These makes it difficult to compute its state-transition matrix or the Jacobian for the equations. This paper proposes a modification technique for the the Jacobian evaluation in the shooting method. It is evaluated indirectly and repeatedly not by the Newton method but by the quasi-Newton method. Three examples of power electronic circuits, a series resonant DC-DC converter, a buck DC-DC converter with sliding-mode control, and a benchmark test circuit by the simulation committee of IEEJ, are analyzed and investigated.

	The Consequences Of Aging Of Electrolytic Capacitors, Used In Dc-Dc Converters, Under Steady-State Operating Conditions By Acacio M. R. Amaral, A. J. Marques Cardoso	[View] [Download]
Abstract: In this paper, a study about the effect of some parasitic elements of switch mode DC-DC converters operating in steadystate regime is presented, as well as an analysis about the consequences of aging of electrolytic capacitors used in the output filter. The aging of electrolytic capacitors, used for smoothing the output voltage manifests by the increase of their equivalent series resistance (ESR), which increases the output voltage ripple. A method for attenuating this effect is proposed. Although the transistor resistance (RS) decrease the efficiency, it can contribute for decreasing the inductor ripple current, which reduces the effect of saturation in the inductor, the stress in the semiconductors, as well as the output voltage ripple. Several theoretical, simulated and experimental results are presented, for a buck type DC-DC converter operating in the continuous conduction mode (CCM).