EPE Association: EPE-PEMC 2000 - Topic 11a: Induction Motor Drives

EPE-PEMC 2000 - Topic 11a: Induction Motor Drives
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2000 - Conference > EPE-PEMC 2000 - Topic 11: Industrial Drive Systems > EPE-PEMC 2000 - Topic 11a: Induction Motor Drives

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   A Low Voltage Asynchronous Drive
By Vorel P. [View]
[Download]

Abstract: The contribution deals with problems of creating an asynchronous drive system (asynchronous motor + pulse-width-modulated inverter) with a low voltage level. The independence of reachable machine parameters on the choice of the voltage level (it means on the voltage-current relations) is explained in the paper. A concrete used asynchronous machine created by rewinding a common three-phase net motor is described. Its parameters are mentioned. The developed regulation algorithm optimising the drive efficiency is proposed. Basic parameters and measurement results of the whole drive, inverter power circuit and digital regulation system as well as some practical experiences with using of that drive are noticed.

   A New Energy Controlled Current Source Inverter Fed Induction Motor Drive
By Fekete G. [View]
[Download]

Abstract: A new induction motor drive control strategy is introduced for current source inverter. The so-called energy model is used. The energy control diagram is presented that is the base of the strategy. Speed or torque control can be realised without measurement or calculation of mechanical speed. Laboratory experimental results are also presented.

   A Novel Switching Strategy for Direct Torque and Stator Flux Control of an Induction Machine
By Naassani A.A., Monmasson E., Louis J.P.* [View]
[Download]

Abstract: In this paper, a novel switching strategy for Direct Torque and Stator Flux Control of an induction machine is considered. Differently from basic version of DTFC, the stator flux components fsa and fsb, in the stator fixed reference frame, are controlled using two three-level hysteresis controllers and a simple switching table. Therefore, all of the eight voltage vectors can be used. Furthermore, these voltage vectors are accurately selected in order to minimise the error of stator flux components Dfsa and Dfsb. The effectiveness of the proposed switching system is verified by experimental tests.

   AC Drive Control With Dynamically Re-configurable AdaptiveController
By Imecs M., Ádám T.*, Bikfalvi P.*, Nedevschi S., Vásárhelyi J.* [View]
[Download]

Abstract: Re-configurable systems are mainly used in configurable computing and embedded control systems. In this paper we present the concept of system reconfiguration and its possible application in vector control for an ac drive using the Triscend Configurable System-on-Chip (CSoC). The idea of a possible reconfiguration of the CSoC for embedded control is also introduced. The controller can be considered a state machine and adaptive control can be avoided. The changes in the control law due to reconfiguration may improve the performance of the controlled system. Some results of implementation and aspects concerning system resource management are also presented.

   Control of a 5-Level Flying Capacitor Multilevel Inverter for DTC Applications
By Escalante M.F., Vannier J.C. [View]
[Download]

Abstract: This paper deals with the application and control of a 5-level flying capacitor multilevel voltage inverter in association with a Direct Torque Control (DTC) strategy. The control strategy applied independently to each inverter leg is capable of keeping the voltage equilibrium across each flying capacitor and at the same time each inverter leg will supply the voltage level demanded by an external control loop. All this is achieved by using the redundancy of the converter states. This approach is going to allow us using all 61 available voltage vectors in a DTC strategy. Simulation and practical results are shown to validate the principle that is proposed.

   Hybrid Control for Loss Minimization of Vector-Controlled Adjustable Speed IM Drives
By Mizuguchi Y., Funato H., Kamiyama K. [View]
[Download]

Abstract: The high efficiency control is desired in industrial applications of vector-controlled induction motors. In this paper, the authors propose a hybrid control strategy consisting of a torque and a flux control loops, which can realize loss minimization in the minimum time after an abrupt change of either a speed reference or a torque disturbance in vector-controlled adjustable speed induction motor drives. The performance characteristics of the response are demonstrated through simulations and tests.

   Improved Microcontrolled Control System for an Efficient Wound Rotor AC Induction Motor Drive
By Fernandez H.*, Giménez de Guzmán M.I., Guzmán V.M. [View]
[Download]

Abstract: This work presents an improved control technique for the resistance commutation control system used in wound rotor AC induction motors, utilized in the 100 tons cranes installed in the steel industry (SIDOR) in Ciudad Guayana, Venezuela. This system is based on a microcontroller. The rotor resistance selection algorithm takes into account the original speed feedback signal produced by the tachogenerator and combines it with three additional signals already present in the original hardware: the speed demand, the current regulator output and the speed regulator error, producing a much more efficient and reliable control system when compared with the standard systems used in the industry, avoiding the usual problems detected in the currently working systems, and keeping the added circutry as simple as possible. The experimental tests confirm the improved system performance. This solution is applicable to other wound rotor AC induction motor drives.

   Simulation and Measurement of Direct Torque Controlled Induction Motor Drive
By Juhász Gy., Halász S., Veszprémi K. [View]
[Download]

Abstract: The Direct Torque Control (DTC) is a modern alternative of the Field Oriented Control in practical applications. The flux and the torque of the induction machine can be controlled directly by this method. The simulation is working under the DTC concept with Switching Table strategy, but for practical implementation some new aspects should be investigated: 1. The current is controlled indirectly, requiring the implementation of the current limitation mainly during starting period. 2. The possible unstable operation in the low speed range should be avoided. 3. The simulation sets the minimal time between two switchings because the dynamic limits of the power switches must be considered. The simulation results are compared to measurements on a commercial drive with the same control. One aspect of the investigations is the dependence of the average switching frequency on different operating conditions.

   Vector Control and Power Optimization of a Doubly Fed Induction Machine in Variable Speed Drives
By Ghosn R., Asmar C., Pietrzak-David M.*, de Fornel B.* [View]
[Download]

Abstract: This paper deals with a doubly fed induction machine (DFIM) of which both stator and rotor are supplied by two voltage inverters. A novel control strategy based on stator flux orientation is developed. The stator and rotor frequencies are chosen in a way so that stator and rotor PWM inverters are sized to almost mechanical rated power. This is an interesting solution compared to conventional speed drive techniques of the DFIM where the whole power for the two inverters is almost twice the rated mechanical power. The mathematical model of the DFIM is presented in a stator field oriented reference frame. After theoretical analysis, simulation results in both steady and transient states are presented.

EPE-PEMC 2000 - Topic 11a: Induction Motor Drives
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2000 - Conference > EPE-PEMC 2000 - Topic 11: Industrial Drive Systems > EPE-PEMC 2000 - Topic 11a: Induction Motor Drives
	[return to parent folder]

	A Low Voltage Asynchronous Drive By Vorel P.	[View] [Download]
Abstract: The contribution deals with problems of creating an asynchronous drive system (asynchronous motor + pulse-width-modulated inverter) with a low voltage level. The independence of reachable machine parameters on the choice of the voltage level (it means on the voltage-current relations) is explained in the paper. A concrete used asynchronous machine created by rewinding a common three-phase net motor is described. Its parameters are mentioned. The developed regulation algorithm optimising the drive efficiency is proposed. Basic parameters and measurement results of the whole drive, inverter power circuit and digital regulation system as well as some practical experiences with using of that drive are noticed.

	A New Energy Controlled Current Source Inverter Fed Induction Motor Drive By Fekete G.	[View] [Download]
Abstract: A new induction motor drive control strategy is introduced for current source inverter. The so-called energy model is used. The energy control diagram is presented that is the base of the strategy. Speed or torque control can be realised without measurement or calculation of mechanical speed. Laboratory experimental results are also presented.

	A Novel Switching Strategy for Direct Torque and Stator Flux Control of an Induction Machine By Naassani A.A., Monmasson E., Louis J.P.*	[View] [Download]
Abstract: In this paper, a novel switching strategy for Direct Torque and Stator Flux Control of an induction machine is considered. Differently from basic version of DTFC, the stator flux components fsa and fsb, in the stator fixed reference frame, are controlled using two three-level hysteresis controllers and a simple switching table. Therefore, all of the eight voltage vectors can be used. Furthermore, these voltage vectors are accurately selected in order to minimise the error of stator flux components Dfsa and Dfsb. The effectiveness of the proposed switching system is verified by experimental tests.

	AC Drive Control With Dynamically Re-configurable AdaptiveController By Imecs M., Ádám T., Bikfalvi P., Nedevschi S., Vásárhelyi J.*	[View] [Download]
Abstract: Re-configurable systems are mainly used in configurable computing and embedded control systems. In this paper we present the concept of system reconfiguration and its possible application in vector control for an ac drive using the Triscend Configurable System-on-Chip (CSoC). The idea of a possible reconfiguration of the CSoC for embedded control is also introduced. The controller can be considered a state machine and adaptive control can be avoided. The changes in the control law due to reconfiguration may improve the performance of the controlled system. Some results of implementation and aspects concerning system resource management are also presented.

	Control of a 5-Level Flying Capacitor Multilevel Inverter for DTC Applications By Escalante M.F., Vannier J.C.	[View] [Download]
Abstract: This paper deals with the application and control of a 5-level flying capacitor multilevel voltage inverter in association with a Direct Torque Control (DTC) strategy. The control strategy applied independently to each inverter leg is capable of keeping the voltage equilibrium across each flying capacitor and at the same time each inverter leg will supply the voltage level demanded by an external control loop. All this is achieved by using the redundancy of the converter states. This approach is going to allow us using all 61 available voltage vectors in a DTC strategy. Simulation and practical results are shown to validate the principle that is proposed.

	Hybrid Control for Loss Minimization of Vector-Controlled Adjustable Speed IM Drives By Mizuguchi Y., Funato H., Kamiyama K.	[View] [Download]
Abstract: The high efficiency control is desired in industrial applications of vector-controlled induction motors. In this paper, the authors propose a hybrid control strategy consisting of a torque and a flux control loops, which can realize loss minimization in the minimum time after an abrupt change of either a speed reference or a torque disturbance in vector-controlled adjustable speed induction motor drives. The performance characteristics of the response are demonstrated through simulations and tests.

	Improved Microcontrolled Control System for an Efficient Wound Rotor AC Induction Motor Drive By Fernandez H., Giménez de Guzmán M.I., Guzmán V.M.*	[View] [Download]
Abstract: This work presents an improved control technique for the resistance commutation control system used in wound rotor AC induction motors, utilized in the 100 tons cranes installed in the steel industry (SIDOR) in Ciudad Guayana, Venezuela. This system is based on a microcontroller. The rotor resistance selection algorithm takes into account the original speed feedback signal produced by the tachogenerator and combines it with three additional signals already present in the original hardware: the speed demand, the current regulator output and the speed regulator error, producing a much more efficient and reliable control system when compared with the standard systems used in the industry, avoiding the usual problems detected in the currently working systems, and keeping the added circutry as simple as possible. The experimental tests confirm the improved system performance. This solution is applicable to other wound rotor AC induction motor drives.

	Simulation and Measurement of Direct Torque Controlled Induction Motor Drive By Juhász Gy., Halász S., Veszprémi K.	[View] [Download]
Abstract: The Direct Torque Control (DTC) is a modern alternative of the Field Oriented Control in practical applications. The flux and the torque of the induction machine can be controlled directly by this method. The simulation is working under the DTC concept with Switching Table strategy, but for practical implementation some new aspects should be investigated: 1. The current is controlled indirectly, requiring the implementation of the current limitation mainly during starting period. 2. The possible unstable operation in the low speed range should be avoided. 3. The simulation sets the minimal time between two switchings because the dynamic limits of the power switches must be considered. The simulation results are compared to measurements on a commercial drive with the same control. One aspect of the investigations is the dependence of the average switching frequency on different operating conditions.

	Vector Control and Power Optimization of a Doubly Fed Induction Machine in Variable Speed Drives By Ghosn R., Asmar C., Pietrzak-David M., de Fornel B.	[View] [Download]
Abstract: This paper deals with a doubly fed induction machine (DFIM) of which both stator and rotor are supplied by two voltage inverters. A novel control strategy based on stator flux orientation is developed. The stator and rotor frequencies are chosen in a way so that stator and rotor PWM inverters are sized to almost mechanical rated power. This is an interesting solution compared to conventional speed drive techniques of the DFIM where the whole power for the two inverters is almost twice the rated mechanical power. The mathematical model of the DFIM is presented in a stator field oriented reference frame. After theoretical analysis, simulation results in both steady and transient states are presented.