EPE Association: EPE 2001 - Topic 06k: Modelling and Simulation

EPE 2001 - Topic 06k: Modelling and Simulation
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2001 - Conference > EPE 2001 - Topic 06: ELECTRICAL MACHINES AND ADJUSTABLE SPEED DRIVES > EPE 2001 - Topic 06k: Modelling and Simulation

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   A Versatile Model of Squirrel Cage Induction Machines
By V. Devanneaux; H. Kabbaj; B. Dagues; J. Faucher [View]
[Download]

Abstract: A versatile and accurate transient model of squirrel cage induction machines is presented. A coupled magnetic circuits approach is used and very few restrictive assumptions are made. All parameters are calculated from the actual geometry and winding layout of the machines rather than from transformed or equivalent variables, making this model suitable for design, monitoring and diagnosis purposes. The detailed depiction of the procedure needed to implement such a versatile model with simulation results is the subject of this paper.

   Adaptive Derivation of Interharmonics in VSD´s
By J. Arrillaga; G. N. Bathurst; N. R. Watson [View]
[Download]

Abstract: The calculation of interharmonics produced by a Variable Speed Drive is performed over a range of operating points using an Iterative Harmonic Analysis technique. The variation of the sideband frequencies and magnitudes with motor operating point are obtained. Also discussed is the effect of different dc link inductor sizes on the interharmonic magnitudes. The method used is shown to be fast and robust while producing reliable information.

   Direct modulation of electrical conversions for a multilevel chopper
By B. François; C. Saudemont; M. Fadel [View]
[Download]

Abstract: In this paper the methodology of the Causal Ordered Graph (COG) is used for the modelling of a flying capacitor cell chopper. The issues of this study is a best understanding of the operating of this particular converter in order to obtain a more precise design of the control system. The obtained modelling shows that high-voltage multi levels are obtained by combination of two different three-level functions (conversion functions). Therefore a novel PWM strategy is deduced. It consists of separating the modulation period for creating two fictive modulated voltages via the direct width modulation and the position setting of both conversion functions. Therefore, the durations of electrical conversions can be precisely calculated and directly processed by modulators. The redundancy of the different switches configurations for the voltage half value allows to use a particular modulation technique which limits the deviations of the half-value voltage. Switching patterns are deduced and a decoupling control of the capacitor voltage and the supply current is designed.

   Dynamic Modeling of Brushless DC Motor Drives
By B-K. Lee; B. Fahimi; M. Ehsani [View]
[Download]

Abstract: A dynamic simulation model for the brushless dc (BLDC) motor drives using Matlab is presented. In this model, an entire BLDC motor drive, including power conversion unit, BLDC motor, and speed/torque control system, is investigated. Especially, the PWM inverter is modeled using switching function concept, so that the detailed voltage and current waveforms, such as line-to-line voltages, inverter input current, ac line current, and switch/diode currents, can be obtained and average/rms ratings of the components can be easily calculated. Also, the proposed model is made into modular blocks and it can be easily extended to other ac motor applications with a little modification. The detailed modeling method is explained and its actual implementation is described. The validity of the proposed model is verified by various simulation results.

   Fractional order modeling of skin effect in induction machine rotor
By J. Faucher; T. Khaorapapong; H. Kabbaj; Y. Lefevre; B. Dagues [View]
[Download]

Abstract: This paper presents a fractional model applied to different shapes of an induction motor rotor bar. The parameters of the model are identified in the frequency domain. The identification is conducted by using the method of the model with a quadratic logarithmic criterion and a Levenberg-Marcquardt optimisation method. The reference data are obtained from a field calculation using a finite element method.

   Harmonic Interaction AFE 3-Level VSI in weak networks with long cabl
By J. Pontt; M. Braun; A. Orellana [View]
[Download]

Abstract: The analysis of the harmonic Interaction of Active-Front-End PWM Three-Level inverters concerning the operation in regenerative mode within a weak network with long cables is presented. For an actual mineral processing application in the Megawatt range, the need of harmonic filters is demonstrated for meeting the standard IEEE-519-92.

   Ind. Masch. parameters: Comparison of calc. and measured values
By P. Pichler; P. Ebner; H. Weiss [View]
[Download]

Abstract: Sensorless control of a PWM inverter fed induction machine yielding a robust, optimally designed traction drive incorporating high starting torque as well as a wide speed range is realised by an extended non-linear machine model. Machine parameter determination variants are compared with measured data. A motor dimensioning procedure is developed.

   Modeling and Simulation of Four Wheels Drive for Electric Vehicle
By L. N. Tutelea; E. Ritchie [View]
[Download]

Abstract: The paper analyses four wheel drive systems for electrical vehicles of induction machine. Energy usage, vehicle range and influence of torque limitation on converter oversize are computed for two solutions in various traffic conditions. Optimized flux control could reduce energy usage, and increase the vehicle range.

   Modeling the Cable Oscillations in the Inverter Fed AC-Machines
By A. Tarkiainen; J. Pyrhönen [View]
[Download]

Abstract: The objective of the paper is to present a model of an induction motor that takes a feeder cable in to account. The feeder cable is modeled using two different transmission line models. The voltage reflections in a long feeder cable of a PWM inverter fed motor produce cable oscillation that can interfere with the control system of the motor. The presented model of an induction motor and a feeder cable is fast enough to simulate that it can be used to study the effect of the cable oscillation on the motor control system.

   New Identification Method for Stator Core-Loss Resistance of AC Motors
By S. Shinnaka [View]
[Download]

Abstract: This paper proposes a new unified method for identifying equivalent stator core-loss resistance of AC motors, which can be applied to both of induction and synchronous motors. In order to make the AC motors exhibit high performance such as precise torque generation and/or efficient energy transmission, stator core-loss cannot be neglected in designing vector control systems. It is common to model stator core-loss in magnetic circuit as loss caused by equivalent resistance in electrical circuit. One of the best mathematical models for controlling AC motors with core-loss is a kind of parallel-type model that succeeds in modeling both eddycurrent and hysteresis losses. The newly proposed method succeeds in identifying separately and simultaneously two kinds of equivalent core-loss resistances on the model corresponding to eddy-current and hysteresis losses. The practical usefulness of the method is evaluated and confirmed through experiments using two induction motors of 5.5 and 2.0 (kW) having relatively high core-loss and a permanent magnet synchronous motor of 750 (W) having relatively low core-loss.

   Simulation of power electronics systems using Simunet
By S. Salama [View]
[Download]

Abstract: This paper describes a new power electronics toolbox Simunet designed to be used with Matlab/Simulink® from the MathWorks Inc. Examples of application of Simunet in the Simulink environment are given and the performance of Simunet is compared with that of Power System Blockset from the MathWork. Simunet convinces enormously in the following fields: 1) Faster simulation speed: more than an order of magnitude 2) Lower size of data file: less than 10% 3) Higher accuracy of the simulation results

   Simulation Of Temperature Distribution In The Induction Machine
By P. Gnacinski [View]
[Download]

Abstract: Temperature distribution in electrical machines is usually simulated by the methods of finite elements and thermal schemes. The method of finite elements enables to obtain very detailed temperature distribution in the machine, although for many applications, it is enough to calculate only one or a few most important temperatures in the machine. If one needs to know only simplified temperature distribution or high speed of calculation is required (for example on-line simulation), the method of thermal schemes is suitable. Thermal schemes differ from each other depending on details of construction of machines as well as on assumed simplification. This paper deals with to comparison of the accuracy of two thermal models: simplified one and comparatively more extended. Results of measurement and computer simulation are presented for 3 kW 1415 rpm total-enclosed induction cage machine.

   Simulations of a synchronous machine affected by voltage sags
By F. Carlsson; J. Engström; C. Sadarangani [View]
[Download]

Abstract: Voltage sags and interruptions are a big power quality problem for the industry. Protection equipment automatically breaks the circuit when the power quality is degraded too much. In many cases short voltage sags or interruptions that lasts for only a hundred milliseconds leads to stoppage for hours in the production. This is mainly due to long start-up times of the industrial process. Simulations have been done on a blast furnace blower in the steel plant SSAB Oxelösund in Sweden. A line operated synchronous machine powers this. If the remaining voltage is higher than 55% there is no need to break at all. These results show that changing the settings in the protection equipment may reduce the number of unwanted shutdowns. In addition, much attention has been paid to the torque variations during and after the sag, and how it depends on the duration of the voltage sag.

EPE 2001 - Topic 06k: Modelling and Simulation
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2001 - Conference > EPE 2001 - Topic 06: ELECTRICAL MACHINES AND ADJUSTABLE SPEED DRIVES > EPE 2001 - Topic 06k: Modelling and Simulation
	[return to parent folder]

	A Versatile Model of Squirrel Cage Induction Machines By V. Devanneaux; H. Kabbaj; B. Dagues; J. Faucher	[View] [Download]
Abstract: A versatile and accurate transient model of squirrel cage induction machines is presented. A coupled magnetic circuits approach is used and very few restrictive assumptions are made. All parameters are calculated from the actual geometry and winding layout of the machines rather than from transformed or equivalent variables, making this model suitable for design, monitoring and diagnosis purposes. The detailed depiction of the procedure needed to implement such a versatile model with simulation results is the subject of this paper.

	Adaptive Derivation of Interharmonics in VSD´s By J. Arrillaga; G. N. Bathurst; N. R. Watson	[View] [Download]
Abstract: The calculation of interharmonics produced by a Variable Speed Drive is performed over a range of operating points using an Iterative Harmonic Analysis technique. The variation of the sideband frequencies and magnitudes with motor operating point are obtained. Also discussed is the effect of different dc link inductor sizes on the interharmonic magnitudes. The method used is shown to be fast and robust while producing reliable information.

	Direct modulation of electrical conversions for a multilevel chopper By B. François; C. Saudemont; M. Fadel	[View] [Download]
Abstract: In this paper the methodology of the Causal Ordered Graph (COG) is used for the modelling of a flying capacitor cell chopper. The issues of this study is a best understanding of the operating of this particular converter in order to obtain a more precise design of the control system. The obtained modelling shows that high-voltage multi levels are obtained by combination of two different three-level functions (conversion functions). Therefore a novel PWM strategy is deduced. It consists of separating the modulation period for creating two fictive modulated voltages via the direct width modulation and the position setting of both conversion functions. Therefore, the durations of electrical conversions can be precisely calculated and directly processed by modulators. The redundancy of the different switches configurations for the voltage half value allows to use a particular modulation technique which limits the deviations of the half-value voltage. Switching patterns are deduced and a decoupling control of the capacitor voltage and the supply current is designed.

	Dynamic Modeling of Brushless DC Motor Drives By B-K. Lee; B. Fahimi; M. Ehsani	[View] [Download]
Abstract: A dynamic simulation model for the brushless dc (BLDC) motor drives using Matlab is presented. In this model, an entire BLDC motor drive, including power conversion unit, BLDC motor, and speed/torque control system, is investigated. Especially, the PWM inverter is modeled using switching function concept, so that the detailed voltage and current waveforms, such as line-to-line voltages, inverter input current, ac line current, and switch/diode currents, can be obtained and average/rms ratings of the components can be easily calculated. Also, the proposed model is made into modular blocks and it can be easily extended to other ac motor applications with a little modification. The detailed modeling method is explained and its actual implementation is described. The validity of the proposed model is verified by various simulation results.

	Fractional order modeling of skin effect in induction machine rotor By J. Faucher; T. Khaorapapong; H. Kabbaj; Y. Lefevre; B. Dagues	[View] [Download]
Abstract: This paper presents a fractional model applied to different shapes of an induction motor rotor bar. The parameters of the model are identified in the frequency domain. The identification is conducted by using the method of the model with a quadratic logarithmic criterion and a Levenberg-Marcquardt optimisation method. The reference data are obtained from a field calculation using a finite element method.

	Harmonic Interaction AFE 3-Level VSI in weak networks with long cabl By J. Pontt; M. Braun; A. Orellana	[View] [Download]
Abstract: The analysis of the harmonic Interaction of Active-Front-End PWM Three-Level inverters concerning the operation in regenerative mode within a weak network with long cables is presented. For an actual mineral processing application in the Megawatt range, the need of harmonic filters is demonstrated for meeting the standard IEEE-519-92.

	Ind. Masch. parameters: Comparison of calc. and measured values By P. Pichler; P. Ebner; H. Weiss	[View] [Download]
Abstract: Sensorless control of a PWM inverter fed induction machine yielding a robust, optimally designed traction drive incorporating high starting torque as well as a wide speed range is realised by an extended non-linear machine model. Machine parameter determination variants are compared with measured data. A motor dimensioning procedure is developed.

	Modeling and Simulation of Four Wheels Drive for Electric Vehicle By L. N. Tutelea; E. Ritchie	[View] [Download]
Abstract: The paper analyses four wheel drive systems for electrical vehicles of induction machine. Energy usage, vehicle range and influence of torque limitation on converter oversize are computed for two solutions in various traffic conditions. Optimized flux control could reduce energy usage, and increase the vehicle range.

	Modeling the Cable Oscillations in the Inverter Fed AC-Machines By A. Tarkiainen; J. Pyrhönen	[View] [Download]
Abstract: The objective of the paper is to present a model of an induction motor that takes a feeder cable in to account. The feeder cable is modeled using two different transmission line models. The voltage reflections in a long feeder cable of a PWM inverter fed motor produce cable oscillation that can interfere with the control system of the motor. The presented model of an induction motor and a feeder cable is fast enough to simulate that it can be used to study the effect of the cable oscillation on the motor control system.

	New Identification Method for Stator Core-Loss Resistance of AC Motors By S. Shinnaka	[View] [Download]
Abstract: This paper proposes a new unified method for identifying equivalent stator core-loss resistance of AC motors, which can be applied to both of induction and synchronous motors. In order to make the AC motors exhibit high performance such as precise torque generation and/or efficient energy transmission, stator core-loss cannot be neglected in designing vector control systems. It is common to model stator core-loss in magnetic circuit as loss caused by equivalent resistance in electrical circuit. One of the best mathematical models for controlling AC motors with core-loss is a kind of parallel-type model that succeeds in modeling both eddycurrent and hysteresis losses. The newly proposed method succeeds in identifying separately and simultaneously two kinds of equivalent core-loss resistances on the model corresponding to eddy-current and hysteresis losses. The practical usefulness of the method is evaluated and confirmed through experiments using two induction motors of 5.5 and 2.0 (kW) having relatively high core-loss and a permanent magnet synchronous motor of 750 (W) having relatively low core-loss.

	Simulation of power electronics systems using Simunet By S. Salama	[View] [Download]
Abstract: This paper describes a new power electronics toolbox Simunet designed to be used with Matlab/Simulink® from the MathWorks Inc. Examples of application of Simunet in the Simulink environment are given and the performance of Simunet is compared with that of Power System Blockset from the MathWork. Simunet convinces enormously in the following fields: 1) Faster simulation speed: more than an order of magnitude 2) Lower size of data file: less than 10% 3) Higher accuracy of the simulation results

	Simulation Of Temperature Distribution In The Induction Machine By P. Gnacinski	[View] [Download]
Abstract: Temperature distribution in electrical machines is usually simulated by the methods of finite elements and thermal schemes. The method of finite elements enables to obtain very detailed temperature distribution in the machine, although for many applications, it is enough to calculate only one or a few most important temperatures in the machine. If one needs to know only simplified temperature distribution or high speed of calculation is required (for example on-line simulation), the method of thermal schemes is suitable. Thermal schemes differ from each other depending on details of construction of machines as well as on assumed simplification. This paper deals with to comparison of the accuracy of two thermal models: simplified one and comparatively more extended. Results of measurement and computer simulation are presented for 3 kW 1415 rpm total-enclosed induction cage machine.

	Simulations of a synchronous machine affected by voltage sags By F. Carlsson; J. Engström; C. Sadarangani	[View] [Download]
Abstract: Voltage sags and interruptions are a big power quality problem for the industry. Protection equipment automatically breaks the circuit when the power quality is degraded too much. In many cases short voltage sags or interruptions that lasts for only a hundred milliseconds leads to stoppage for hours in the production. This is mainly due to long start-up times of the industrial process. Simulations have been done on a blast furnace blower in the steel plant SSAB Oxelösund in Sweden. A line operated synchronous machine powers this. If the remaining voltage is higher than 55% there is no need to break at all. These results show that changing the settings in the protection equipment may reduce the number of unwanted shutdowns. In addition, much attention has been paid to the torque variations during and after the sag, and how it depends on the duration of the voltage sag.