EPE Association: EPE 1999 - Topic 12: EDUCATION

EPE 1999 - Topic 12: EDUCATION
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1999 - Conference > EPE 1999 - Topic 12: EDUCATION

   [return to parent folder]

   EPE 1999 - Topic 12a: Education Methodology

In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Education Methodology"

   EPE 1999 - Topic 12b: Education Tools

In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Education Tools"

   A LabVIEW-based Experimental Example of Chaotic Transition in a Simple PWM Converter
By S. Cincotti; M. Marchesi; A. Serri [View]
[Download]

Abstract: The paper describes numerical simulations and experimental evidences of chaotic behaviour in a simple PWM converter with digital control. Experimental examples of strange behaviour in power electronics converters are proposed to highlight the non-linear dynamic resulting from switching operation. Circuit examples are selected to point out the effect of parasitic effects of power electronic devices and non-linearities in the control. Chaotic transition of PWM converter results as waterfall period doubling bifurcations determined by increasing the control gain. The laboratory measurement system is developed using PC, DAQ-board and LabVIEW software so to obtain an improved usability of the hardware. Moreover, due to the simple set-up, the topic has been included in a course for graduated student so to improve understanding of chaotic behaviour in non-linear dynamic electric systems.

   An Experimental and Computational Tool for Teaching Induction Motor Drives
By C. Goldemberg; A. de Arruda Penteado Jr. [View]
[Download]

Abstract: This work describes an educational framework for teaching induction motor drives, which is composed by a computational environment and an experimental arrangement. Machine modelling is fully based on ABC/abc induction machine model, without requiring from undergraduate students knowledge about any kind of reference frame transformation. The use of conventional inductance parameters, easily measurable, also helps understanding the model. Several laboratory experiments can be made and compared with simulation results. Among these are the direct on line start, the wye-delta start, the use of soft-starters and the use of PWM inverters of several manufacturers.

   DySS: Snubber Designer and Device Model Generator Program
By J. C. Regidor; V. M. Guzmán; M. I. Giménez [View]
[Download]

Abstract: The calculations required to design low loss energy-recovering snubbers and to generate personalized switching device macromodels are tie consuming and error prone tasks, so an automated approach is very desirable. In particular, snubber inverter design (using either single capacitor or three-pole configuration) requires a trade-off between critical circuit parameters. The subsequent inverter SPICE simulation demands a model for the switching device. If a black-box device model, such as the GTO macromodel is used, only the externally observed device behavior, presented in the manufacturer's datasheet is necessary; the calculations required are long, but they can be set up in a well defined, step by step non recursive sequence. DyDD integrates all these design procedures in a single CAD interactive application, using the Macintosh Graphic User Interface (GUI). SPICE compatible circuit files are produced at user's request, thus eliminating transcription errors.

   Explanation of De-tuning in Vector-controlled Induction-motor Dri...
By N. Mohan; M. Riaz; A. Kumar Jain [View]
[Download]

Abstract: The objective of this paper is to explain vector control from a physical standpoint. It is shown how steady-state analysis based on space-vector-theory leads naturally to a physical explanation of vector control. An analogy with a current excited transformer with a short-circuited secondary is used to help explain the basic concepts of vector control. The mathematical expressions associated with a vector-controlled drive are derived from basic principles. It is shown that the vector-controlled model of the induction motor is also valid under general conditions. PSpice offers an excellent platform for modeling of the vector controlled drive for illustration of the effects of de-tuning. By simplifying its explanation, vector control can be taught, at least qualitatively, in the first course on electric drives to a relatively large number of students, potentially resulting in more applications of vector control, and further research and innovation.

   First Course on Power Electronics Simplified by Unifying Analysis of PWM Converters as Cycle-by-Cycle Averaged Two-Ports, and by PSpice-based Simulations
By N. Mohan; G. Shanmugavel; P. Holenarsipur; G. Nirgude [View]
[Download]

Abstract: Single-switch dc-dc converters and inverters for motor drives can be analyzed in a unified manner by identifying the fundamental building block used in their implementation. The fundamental building block can be represented as a two-port network by using cycle-by-cycle averaging (CCA) technique. Such a representation enables the analysis of switching converters using classical tools such as frequency domain methods. This approach, well suited for the first course on Power Electronics, clearly illustrates the objective of the pulse-width-modulated (PWM) switching process in synthesizing the output in switch-mode converters. Further, the use of an averaged representation of the switching process helps speed-up dynamical simulations in circuit simulators like PSpice. This paper describes the CCA technique and representation of converters using CCA model of switching elements.

   How to Introduce Power Switching Components for Students? An Experimental way.
By M. Vitiello; M. Bensoam; D. Lafore [View]
[Download]

Abstract: Given the wide variety of available switching devices (GTO, MOSFET, IGBT, MCT, .....) and the range of switching modes used by converters (hard and soft switching), it is very difficult for power electronic designer to have a clear view of the real capabilities of each component and to choose the best one for a particular use. Since few years, EEPS Department works on power losses measurement and metrology for power component. A test machine (SAEP [4]) has been built and measurements problems have been resolved. The device presented here is derived from this machine, simplified and adapted to have specified tool. This paper presents methods for evaluating power electronic components, driving circuit and all the environment of active components in various operating conditions. All of them are real ‘one shot test’. The advantages of this technique is that the energy consumption is very low, not destructive for the component, and each parameter could be adjusted as independently as possible.

   Simulation of PWM Induction Motor Drives by Means of Mathcad
By H. van der Broeck [View]
[Download]

Abstract: Variable speed drives consisting of voltage fed PWM inverters and induction motors are state of the art today. Hence, it should be a mandatory subject for students in electrical power engineering. This paper shows how the steady state behavior of an induction motor drive supplied by a PWM inverter can easily be simulated using the CAD tool Mathcad. Any operation point of the drive can be set by a minimum number of normalised system parameters. the developed program is very suitable for studying and lecturing since illustrations showing PWM effects can easily be created.

EPE 1999 - Topic 12: EDUCATION
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1999 - Conference > EPE 1999 - Topic 12: EDUCATION
	[return to parent folder]

	EPE 1999 - Topic 12a: Education Methodology
In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Education Methodology"
	EPE 1999 - Topic 12b: Education Tools
In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Education Tools"

	A LabVIEW-based Experimental Example of Chaotic Transition in a Simple PWM Converter By S. Cincotti; M. Marchesi; A. Serri	[View] [Download]
Abstract: The paper describes numerical simulations and experimental evidences of chaotic behaviour in a simple PWM converter with digital control. Experimental examples of strange behaviour in power electronics converters are proposed to highlight the non-linear dynamic resulting from switching operation. Circuit examples are selected to point out the effect of parasitic effects of power electronic devices and non-linearities in the control. Chaotic transition of PWM converter results as waterfall period doubling bifurcations determined by increasing the control gain. The laboratory measurement system is developed using PC, DAQ-board and LabVIEW software so to obtain an improved usability of the hardware. Moreover, due to the simple set-up, the topic has been included in a course for graduated student so to improve understanding of chaotic behaviour in non-linear dynamic electric systems.

	An Experimental and Computational Tool for Teaching Induction Motor Drives By C. Goldemberg; A. de Arruda Penteado Jr.	[View] [Download]
Abstract: This work describes an educational framework for teaching induction motor drives, which is composed by a computational environment and an experimental arrangement. Machine modelling is fully based on ABC/abc induction machine model, without requiring from undergraduate students knowledge about any kind of reference frame transformation. The use of conventional inductance parameters, easily measurable, also helps understanding the model. Several laboratory experiments can be made and compared with simulation results. Among these are the direct on line start, the wye-delta start, the use of soft-starters and the use of PWM inverters of several manufacturers.

	DySS: Snubber Designer and Device Model Generator Program By J. C. Regidor; V. M. Guzmán; M. I. Giménez	[View] [Download]
Abstract: The calculations required to design low loss energy-recovering snubbers and to generate personalized switching device macromodels are tie consuming and error prone tasks, so an automated approach is very desirable. In particular, snubber inverter design (using either single capacitor or three-pole configuration) requires a trade-off between critical circuit parameters. The subsequent inverter SPICE simulation demands a model for the switching device. If a black-box device model, such as the GTO macromodel is used, only the externally observed device behavior, presented in the manufacturer's datasheet is necessary; the calculations required are long, but they can be set up in a well defined, step by step non recursive sequence. DyDD integrates all these design procedures in a single CAD interactive application, using the Macintosh Graphic User Interface (GUI). SPICE compatible circuit files are produced at user's request, thus eliminating transcription errors.

	Explanation of De-tuning in Vector-controlled Induction-motor Dri... By N. Mohan; M. Riaz; A. Kumar Jain	[View] [Download]
Abstract: The objective of this paper is to explain vector control from a physical standpoint. It is shown how steady-state analysis based on space-vector-theory leads naturally to a physical explanation of vector control. An analogy with a current excited transformer with a short-circuited secondary is used to help explain the basic concepts of vector control. The mathematical expressions associated with a vector-controlled drive are derived from basic principles. It is shown that the vector-controlled model of the induction motor is also valid under general conditions. PSpice offers an excellent platform for modeling of the vector controlled drive for illustration of the effects of de-tuning. By simplifying its explanation, vector control can be taught, at least qualitatively, in the first course on electric drives to a relatively large number of students, potentially resulting in more applications of vector control, and further research and innovation.

	First Course on Power Electronics Simplified by Unifying Analysis of PWM Converters as Cycle-by-Cycle Averaged Two-Ports, and by PSpice-based Simulations By N. Mohan; G. Shanmugavel; P. Holenarsipur; G. Nirgude	[View] [Download]
Abstract: Single-switch dc-dc converters and inverters for motor drives can be analyzed in a unified manner by identifying the fundamental building block used in their implementation. The fundamental building block can be represented as a two-port network by using cycle-by-cycle averaging (CCA) technique. Such a representation enables the analysis of switching converters using classical tools such as frequency domain methods. This approach, well suited for the first course on Power Electronics, clearly illustrates the objective of the pulse-width-modulated (PWM) switching process in synthesizing the output in switch-mode converters. Further, the use of an averaged representation of the switching process helps speed-up dynamical simulations in circuit simulators like PSpice. This paper describes the CCA technique and representation of converters using CCA model of switching elements.

	How to Introduce Power Switching Components for Students? An Experimental way. By M. Vitiello; M. Bensoam; D. Lafore	[View] [Download]
Abstract: Given the wide variety of available switching devices (GTO, MOSFET, IGBT, MCT, .....) and the range of switching modes used by converters (hard and soft switching), it is very difficult for power electronic designer to have a clear view of the real capabilities of each component and to choose the best one for a particular use. Since few years, EEPS Department works on power losses measurement and metrology for power component. A test machine (SAEP [4]) has been built and measurements problems have been resolved. The device presented here is derived from this machine, simplified and adapted to have specified tool. This paper presents methods for evaluating power electronic components, driving circuit and all the environment of active components in various operating conditions. All of them are real ‘one shot test’. The advantages of this technique is that the energy consumption is very low, not destructive for the component, and each parameter could be adjusted as independently as possible.

	Simulation of PWM Induction Motor Drives by Means of Mathcad By H. van der Broeck	[View] [Download]
Abstract: Variable speed drives consisting of voltage fed PWM inverters and induction motors are state of the art today. Hence, it should be a mandatory subject for students in electrical power engineering. This paper shows how the steady state behavior of an induction motor drive supplied by a PWM inverter can easily be simulated using the CAD tool Mathcad. Any operation point of the drive can be set by a minimum number of normalised system parameters. the developed program is very suitable for studying and lecturing since illustrations showing PWM effects can easily be created.