EPE Association: EPE 2001 - Topic 06j: Energy Efficient Drives

EPE 2001 - Topic 06j: Energy Efficient Drives
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 06j: Energy Efficient Drives

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   Implementation of Energy Optimized Controls for Synchronous Drive
By R. Trigui; F. Harel; J. Scordia; Ph. Bastiani; J. M. Rétif; X. Lin-Shi; F. Chabot; E. Gimet; J. Beretta [View]
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Abstract: This paper presents an implementation and comparison of three approaches for an energy-optimized synchronous-drive control. A digital control is carried out allowing an energy saving with widely sufficient dynamic operation for Electric and Hybrid Vehicles (E&HV) applications. The experimental results show a good current controller performance and a considerable efficiency gain compared to a non optimized control.

   Implementation of neuro-optimal controller based on recursive Gauss-Ne
By M. Gaiceanu [View]
[Download]

Abstract: It is known that the three-phase squirrel cage induction motors are the major world energy consumers. Thus, the research is focused on the reduction of the energy consumption field. Because the transient regimes (desired and accidental) are dominant, in this paper a method of optimal control based on energetic criteria for dynamic regimes of AC drive with three-phase induction motor, is involved. The disadvantages of the matrix Riccati differential equation solution (MRDE) are avoided by realizing a nonrecursive one. The optimal control synthesis consisting of the determination of the stator threephase currents system, based on the longitudinal and transversal components of the stator phasor current. The optimal control law provides dynamic regimes with minimal input energy consumption and minimal windings energy dissipation. The optimal nonrecursive solution is obtained by numerical integration of the MRDE. Using a feed forward neural network approximates the optimal control solution. In order to improve the back propagation training algorithm a Recursive Gauss-Newton Training Algorithm (RGNTA) was presented. Thus, the second derivatives information was involved in order to provide the optimal solution. The convergence of the RGNTA is faster then the back propagation one, and more robustness. In order to establish the neural network (NN) architecture the author had in view to avoid reaching the local minimum [1]. The experimental results show both the optimal characteristics of the MRDE solution and the properties of the NN. Also, are emphasized the advantage of this control strategy versus classical control system in AC drives. The rotor field oriented IM controlled at constant flux was considerate.

   Modeling and Evaluation of dv/dt Filters for ASD
By A. F. Moreira; T. A. Lipo; G. Venkataramanan; S. Bernet [View]
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Abstract: Recent advances in power electronic switching device technology have resulted in dramatic improvements and cost reduction of pulse-width modulated AC adjustable speed drives. Concomitant with the better performance enabled by the high switching speed and increased switching frequency they have also raised several concerns related to the consequences of high speed switching. One of these concerns is the over-voltage that appears at the motor terminals due to the impedance mismatch between the power cable and the motor. This paper develops accurate simulation models for power cables and motors that allow a better understanding of the over-voltage problem. The models can be readily implemented using computational tools like Matlab, thereby providing a convenient method to develop the best dv/dt filter solution for a particular drive. The power cable is modeled using several lumped-parameter segments of a lossy representation of transmission line. An algebraic analysis is developed to choose an adequate number of lumped-parameter segments. The number of required segment is function of the pulse rise time, cable characteristic parameters and cable length. Simulation results are presented analyzing the over-voltage problem for a wide range of pulse rise times and cable lengths for 1hp, 10hp and 100hp motors. The most important filter network solutions are investigated using the simulation program and an optimized design is performed for the RC Filter at the motor terminals. Experimental results verifying the validity of the model for the over-voltage analysis are presented.

   Single-phase external rotor synchronous motor
By A. Lelkes; J. Krotsch [View]
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Abstract: An electronically commutated (EC) permanent-magnet motor has a higher efficiency than a singlephase induction motor. In addition, EC motors have some further advantages: wide speed range and easy speed controllability. If the latter features are not decisive, a highly efficient mains-fed ferrite magnet synchronous motor represents an interesting alternative. An external rotor motor is especially advantageous for fan applications enabling a compact impeller-motor-unit. However, it has a high inertia. Therefore, direct-on-line starting is not applicable. The starting problem can be solved by the proposed microprocessor controlled triac circuit. Once the rotor is synchronized, the motor is permanently connected to the mains and operates with high efficiency at constant speed. This starter circuit is less expensive, smaller and more temperature-resistant than the electronics of an EC motor.

   symetrisation of asymmetrical short-circuits in IGBT drives
By A.Colasse; L. Delporte; J-E. Masselus [View]
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Abstract: This paper presents the implementation of a protection strategy to reduce the transient overtorque of an induction motor in case of failure of the IGBT voltage source inverter feeding this motor. The protection strategy is applicable to 2-level and 3-level inverters and was implemented on several railways vehicles.

EPE 2001 - Topic 06j: Energy Efficient Drives
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 06j: Energy Efficient Drives
	[return to parent folder]

	Implementation of Energy Optimized Controls for Synchronous Drive By R. Trigui; F. Harel; J. Scordia; Ph. Bastiani; J. M. Rétif; X. Lin-Shi; F. Chabot; E. Gimet; J. Beretta	[View] [Download]
Abstract: This paper presents an implementation and comparison of three approaches for an energy-optimized synchronous-drive control. A digital control is carried out allowing an energy saving with widely sufficient dynamic operation for Electric and Hybrid Vehicles (E&HV) applications. The experimental results show a good current controller performance and a considerable efficiency gain compared to a non optimized control.

	Implementation of neuro-optimal controller based on recursive Gauss-Ne By M. Gaiceanu	[View] [Download]
Abstract: It is known that the three-phase squirrel cage induction motors are the major world energy consumers. Thus, the research is focused on the reduction of the energy consumption field. Because the transient regimes (desired and accidental) are dominant, in this paper a method of optimal control based on energetic criteria for dynamic regimes of AC drive with three-phase induction motor, is involved. The disadvantages of the matrix Riccati differential equation solution (MRDE) are avoided by realizing a nonrecursive one. The optimal control synthesis consisting of the determination of the stator threephase currents system, based on the longitudinal and transversal components of the stator phasor current. The optimal control law provides dynamic regimes with minimal input energy consumption and minimal windings energy dissipation. The optimal nonrecursive solution is obtained by numerical integration of the MRDE. Using a feed forward neural network approximates the optimal control solution. In order to improve the back propagation training algorithm a Recursive Gauss-Newton Training Algorithm (RGNTA) was presented. Thus, the second derivatives information was involved in order to provide the optimal solution. The convergence of the RGNTA is faster then the back propagation one, and more robustness. In order to establish the neural network (NN) architecture the author had in view to avoid reaching the local minimum [1]. The experimental results show both the optimal characteristics of the MRDE solution and the properties of the NN. Also, are emphasized the advantage of this control strategy versus classical control system in AC drives. The rotor field oriented IM controlled at constant flux was considerate.

	Modeling and Evaluation of dv/dt Filters for ASD By A. F. Moreira; T. A. Lipo; G. Venkataramanan; S. Bernet	[View] [Download]
Abstract: Recent advances in power electronic switching device technology have resulted in dramatic improvements and cost reduction of pulse-width modulated AC adjustable speed drives. Concomitant with the better performance enabled by the high switching speed and increased switching frequency they have also raised several concerns related to the consequences of high speed switching. One of these concerns is the over-voltage that appears at the motor terminals due to the impedance mismatch between the power cable and the motor. This paper develops accurate simulation models for power cables and motors that allow a better understanding of the over-voltage problem. The models can be readily implemented using computational tools like Matlab, thereby providing a convenient method to develop the best dv/dt filter solution for a particular drive. The power cable is modeled using several lumped-parameter segments of a lossy representation of transmission line. An algebraic analysis is developed to choose an adequate number of lumped-parameter segments. The number of required segment is function of the pulse rise time, cable characteristic parameters and cable length. Simulation results are presented analyzing the over-voltage problem for a wide range of pulse rise times and cable lengths for 1hp, 10hp and 100hp motors. The most important filter network solutions are investigated using the simulation program and an optimized design is performed for the RC Filter at the motor terminals. Experimental results verifying the validity of the model for the over-voltage analysis are presented.

	Single-phase external rotor synchronous motor By A. Lelkes; J. Krotsch	[View] [Download]
Abstract: An electronically commutated (EC) permanent-magnet motor has a higher efficiency than a singlephase induction motor. In addition, EC motors have some further advantages: wide speed range and easy speed controllability. If the latter features are not decisive, a highly efficient mains-fed ferrite magnet synchronous motor represents an interesting alternative. An external rotor motor is especially advantageous for fan applications enabling a compact impeller-motor-unit. However, it has a high inertia. Therefore, direct-on-line starting is not applicable. The starting problem can be solved by the proposed microprocessor controlled triac circuit. Once the rotor is synchronized, the motor is permanently connected to the mains and operates with high efficiency at constant speed. This starter circuit is less expensive, smaller and more temperature-resistant than the electronics of an EC motor.

	symetrisation of asymmetrical short-circuits in IGBT drives By A.Colasse; L. Delporte; J-E. Masselus	[View] [Download]
Abstract: This paper presents the implementation of a protection strategy to reduce the transient overtorque of an induction motor in case of failure of the IGBT voltage source inverter feeding this motor. The protection strategy is applicable to 2-level and 3-level inverters and was implemented on several railways vehicles.