EPE Association: EPE 2003 - Topic 08g: Modelling, Simulation and Control

EPE 2003 - Topic 08g: Modelling, Simulation and Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2003 - Conference > EPE 2003 - Topic 08: POWER SUPPLIES > EPE 2003 - Topic 08g: Modelling, Simulation and Control

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   Effect of load dynamics on converter performance
By T. Tepsa; T. Suntio [View]
[Download]

Abstract: This paper presents a consistent methodology to assess the effect of load on the converter dynamics to obtain robust product quality. The proper formalism facilitating the analysis is derived using an unterminated two-port model of a converter. It is shown that the open-loop output impedance behaves as a weight either emphasizing or rejecting the load effects. Smooth loads with reasonable values have insignificant effect on a properly designed converter. Loads with small overall impedance such as storage battery or converters with input filter due to resonant peaking may reduce drastically the voltage-loop control bandwidth, or increase the current-loop control bandwidth, respectively.

   Fast determination of the steady state for cyclically-switched converters through space mapping
By M. Michon; J.L. Duarte; M. Hendrix [View]
[Download]

Abstract: Space mapping is introduced as a tool for quickly determining the steady state of cyclically-switched converters. This new tool has the advantage that, next to calculating the steady state of circuits that are exactly defined, it can also calculate the steady state of circuits that are not exactly known, based upon measurements on these circuits. Its convergence speed is compared to that of an existing Newton based equivalent by applying both on an example. Because of limitations in the Newton based method a simplified version of the space mapping algorithm is sufficient here. However the comparison leads to some promising results.

   Simulation of DC-DC converters for motherboard CPU power supply
By J. Ruiz Sevillano; D. Lindenmeyer; A. Kiep [View]
[Download]

Abstract: This paper presents the challenges associated with the simulation of high-frequency dc/dc power supplies. An introduction into the requirements for high-frequency dc/dc converters for microprocessor power supplies is given and it is shown in detail how they can be modeled in PSpice. The simulation results are verified by measurements carried out on a real dc/dc converter system. Finally, an example is given which shows how simulation can be utilized in order to gain a better understanding of the system behavior and impact of system modifications.

   Control of parallel-connected inverters: A fixed-frequency quasi-sliding mode control approach
By R. Ramos; D. Biel; E. Fossas; F. Guinjoan [View]
[Download]

Abstract: A fixed-frequency quasi-sliding control algorithm is reported and applied to the design of an inverter system of N parallel-connected single-phase inverters. Experimental results for two inverters are provided to illustrate the features of the design in terms of AC output voltage regulation, balanced current-sharing, fixed-frequency operation and robustness in front of load variations.

   Automatic modelling of static converter average models
By F. Verdiere; S. Bacha; L. Gerbaud [View]
[Download]

Abstract: The paper deals with an approach that allows to automate the average modelling of static converter, by proposing to give the generated models under a structured symbolic representation. This allows using these models in several ways without being linked to any tool, e.g.: for control studies, for sizing, etc. At the present time, the model builder is limited to DC-DC converters, and uses both symbolic and graphical approaches.

   New non-linear simulink model based on heaviside unitary pulse functions for switch-mode PWM converter circuits
By A. A. Nogueiras Melendez; A. Lago Ferreiro; J. Doval Gandoy; J. Marcos Acevedo; C. Martinez-Penalver Freire [View]
[Download]

Abstract: A new mathematical model of Pulse-Width Modulation (PWM) process is developed to attain behavioral non-linear simulation of Switch-mode power converters. Applying the Laplace transformation and Heaviside unitary pulse function, a non-linear mathematical model of the PWM pulses is achieved. This mathematical model lead to a non-linear Simulink simulation model, validated against perturbations and employed to obtain dierent PWM techniques and employed to facilitate the simulation of DC-to-DC converters and VSI.

   Complete-system simulation of SMPS devices
By G. Eckl; C. Stumvoll [View]
[Download]

Abstract: The aim of this paper is to discuss the actual situation concerning virtual prototyping in SMPS-development and to propose a different strategy, a so-called „Bottom Up-Strategy“ to develop a component-level based model of the entire power supply system. The following pages will give a more detailed view on how such a component level based model of a SMPS-System is developed and the results are compared with the measurements.

   A proposal of modelling and sliding mode controller applied to PWM DC-DC converters
By C. Jaen; R. Pindado; J. Pou [View]
[Download]

Abstract: A modelling methodology, applied to PWM DC-DC converters is presented in this paper. Parasitic resistors have been considered in inductor and in the power supply. A generalised equivalent circuit based on averaged variables is obtained for the basic structures of DC-DC converters. This circuit and the associated model are valid for continuous conduction mode and discontinuous conduction mode. The work also contains expressions to detect changes of converter operation mode, and to estimate the value of diode duty cycle in the case of discontinuous conduction mode. Both equations use only averaged variables and converter parameters. A sliding mode controller for regulating the output voltage is also designed in terms of averaged state variables and converter parameters. The procedure has been applied to a Buck converter. Simulations under MATLAB-Simulink environment are presented. The results under open loop operation show good behaviour of the averaged model even in case of strong variation on load or command. Finally, results obtained under closed loop operation are also illustrated giving a good dynamic response of the designed controller.

   CAD of matrix converter systems and their control of AC power supplies
By P. Zanchetta; J. Clare; P. Wheeler [View]
[Download]

Abstract: This paper deals with modeling methodologies for CAD of matrix converter systems and their control structures for AC power supplies. The aim is to develop modeling techniques which minimize design effort, reduce computational time and provide robust convergence with all the most common simulation environments. In addition, a Genetic Algorithm based approach for automatic optimization of the structure and the parameters of the digital controller has been developed and successfully used. It recursively run the optimized simulation and finds out the best control solution by minimizing a suitably defined fitness function. Using these techniques, Saber and Matlab-Simulink environments have been employed to design the control for a 40kVA ground power supply unit (400Hz output, 60Hz input) for aircraft servicing. Extensive simulations of this particular application have proved the effectiveness of the proposed methodologies. The control design techniques are applicable to a wider range of systems which have stringent and complex control requirements.

EPE 2003 - Topic 08g: Modelling, Simulation and Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2003 - Conference > EPE 2003 - Topic 08: POWER SUPPLIES > EPE 2003 - Topic 08g: Modelling, Simulation and Control
	[return to parent folder]

	Effect of load dynamics on converter performance By T. Tepsa; T. Suntio	[View] [Download]
Abstract: This paper presents a consistent methodology to assess the effect of load on the converter dynamics to obtain robust product quality. The proper formalism facilitating the analysis is derived using an unterminated two-port model of a converter. It is shown that the open-loop output impedance behaves as a weight either emphasizing or rejecting the load effects. Smooth loads with reasonable values have insignificant effect on a properly designed converter. Loads with small overall impedance such as storage battery or converters with input filter due to resonant peaking may reduce drastically the voltage-loop control bandwidth, or increase the current-loop control bandwidth, respectively.

	Fast determination of the steady state for cyclically-switched converters through space mapping By M. Michon; J.L. Duarte; M. Hendrix	[View] [Download]
Abstract: Space mapping is introduced as a tool for quickly determining the steady state of cyclically-switched converters. This new tool has the advantage that, next to calculating the steady state of circuits that are exactly defined, it can also calculate the steady state of circuits that are not exactly known, based upon measurements on these circuits. Its convergence speed is compared to that of an existing Newton based equivalent by applying both on an example. Because of limitations in the Newton based method a simplified version of the space mapping algorithm is sufficient here. However the comparison leads to some promising results.

	Simulation of DC-DC converters for motherboard CPU power supply By J. Ruiz Sevillano; D. Lindenmeyer; A. Kiep	[View] [Download]
Abstract: This paper presents the challenges associated with the simulation of high-frequency dc/dc power supplies. An introduction into the requirements for high-frequency dc/dc converters for microprocessor power supplies is given and it is shown in detail how they can be modeled in PSpice. The simulation results are verified by measurements carried out on a real dc/dc converter system. Finally, an example is given which shows how simulation can be utilized in order to gain a better understanding of the system behavior and impact of system modifications.

	Control of parallel-connected inverters: A fixed-frequency quasi-sliding mode control approach By R. Ramos; D. Biel; E. Fossas; F. Guinjoan	[View] [Download]
Abstract: A fixed-frequency quasi-sliding control algorithm is reported and applied to the design of an inverter system of N parallel-connected single-phase inverters. Experimental results for two inverters are provided to illustrate the features of the design in terms of AC output voltage regulation, balanced current-sharing, fixed-frequency operation and robustness in front of load variations.

	Automatic modelling of static converter average models By F. Verdiere; S. Bacha; L. Gerbaud	[View] [Download]
Abstract: The paper deals with an approach that allows to automate the average modelling of static converter, by proposing to give the generated models under a structured symbolic representation. This allows using these models in several ways without being linked to any tool, e.g.: for control studies, for sizing, etc. At the present time, the model builder is limited to DC-DC converters, and uses both symbolic and graphical approaches.

	New non-linear simulink model based on heaviside unitary pulse functions for switch-mode PWM converter circuits By A. A. Nogueiras Melendez; A. Lago Ferreiro; J. Doval Gandoy; J. Marcos Acevedo; C. Martinez-Penalver Freire	[View] [Download]
Abstract: A new mathematical model of Pulse-Width Modulation (PWM) process is developed to attain behavioral non-linear simulation of Switch-mode power converters. Applying the Laplace transformation and Heaviside unitary pulse function, a non-linear mathematical model of the PWM pulses is achieved. This mathematical model lead to a non-linear Simulink simulation model, validated against perturbations and employed to obtain dierent PWM techniques and employed to facilitate the simulation of DC-to-DC converters and VSI.

	Complete-system simulation of SMPS devices By G. Eckl; C. Stumvoll	[View] [Download]
Abstract: The aim of this paper is to discuss the actual situation concerning virtual prototyping in SMPS-development and to propose a different strategy, a so-called „Bottom Up-Strategy“ to develop a component-level based model of the entire power supply system. The following pages will give a more detailed view on how such a component level based model of a SMPS-System is developed and the results are compared with the measurements.

	A proposal of modelling and sliding mode controller applied to PWM DC-DC converters By C. Jaen; R. Pindado; J. Pou	[View] [Download]
Abstract: A modelling methodology, applied to PWM DC-DC converters is presented in this paper. Parasitic resistors have been considered in inductor and in the power supply. A generalised equivalent circuit based on averaged variables is obtained for the basic structures of DC-DC converters. This circuit and the associated model are valid for continuous conduction mode and discontinuous conduction mode. The work also contains expressions to detect changes of converter operation mode, and to estimate the value of diode duty cycle in the case of discontinuous conduction mode. Both equations use only averaged variables and converter parameters. A sliding mode controller for regulating the output voltage is also designed in terms of averaged state variables and converter parameters. The procedure has been applied to a Buck converter. Simulations under MATLAB-Simulink environment are presented. The results under open loop operation show good behaviour of the averaged model even in case of strong variation on load or command. Finally, results obtained under closed loop operation are also illustrated giving a good dynamic response of the designed controller.

	CAD of matrix converter systems and their control of AC power supplies By P. Zanchetta; J. Clare; P. Wheeler	[View] [Download]
Abstract: This paper deals with modeling methodologies for CAD of matrix converter systems and their control structures for AC power supplies. The aim is to develop modeling techniques which minimize design effort, reduce computational time and provide robust convergence with all the most common simulation environments. In addition, a Genetic Algorithm based approach for automatic optimization of the structure and the parameters of the digital controller has been developed and successfully used. It recursively run the optimized simulation and finds out the best control solution by minimizing a suitably defined fitness function. Using these techniques, Saber and Matlab-Simulink environments have been employed to design the control for a 40kVA ground power supply unit (400Hz output, 60Hz input) for aircraft servicing. Extensive simulations of this particular application have proved the effectiveness of the proposed methodologies. The control design techniques are applicable to a wider range of systems which have stringent and complex control requirements.