EPE Association: EPE 1997 â€“ 69: Dialogue Session DS5k: CONTROL OF AC MACHINES: INDUSTRIAL APPLICATIONS

EPE 1997 â€“ 69: Dialogue Session DS5k: CONTROL OF AC MACHINES: INDUSTRIAL APPLICATIONS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 â€“ 69: Dialogue Session DS5k: CONTROL OF AC MACHINES: INDUSTRIAL APPLICATIONS

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   A MOTOR DRIVING CONTROLLER SUITABLE FOR ELEVATORS
By N. Mutoh; N. Ohnuma; A. Omiya; S. Hokari; M. Konya; T. Mine [View]
[Download]

Abstract: An induction motor driving Â·COntroller which can improve perfonnance of ele~ators is. studi~d. The controller has three features. First, it has energy saving control by which the mductton motor stably generates the motor torque at the maximum efficiency, regardless of the number of passengers boarding the car, even if both acceleration from standstill and deceleration from steady state are done for any elevator. Second, it can suppress vertical vibrations of elevators while performing energy saving control. Third, it ensures good performance of elevators even when a source voltage is reduced due to an overload at the source sides. 'I11e controller is judged suitable for the drive system of elevators on the basis of simulations and experiments.

   VARIABLE STRUCTURE CONTROL FOR HIGH POWER INDUCTION MOTORS DRIVEN BY GTO INVERTER
By F. Ben Ammar; H. Godfroid; J. F. Yhuel; S. Siala [View]
[Download]

Abstract: In this paper, the authors describe a high-power induction motor speed drive, fed by a voltage inverter using gate turuoff thyristors (GTOs). The Variable Structure Controller is designed in d-q plane. The stator flux (I)sd and the torque-producing current lsq, are controlled by mains of a hysteresis controllers. Under all operating conditions, the discontinuous multi-input control is selected to force the motion of the state system along the intersection of a two switching surfaces. Also, at constant switching frequency operation, the sampling-time is taken into account in the adjustement of hysteresis widths to the motor speed. Improved simulation results are obtained with low switching frequency and excellent torque controllability.

   APPLICATION OF FIELD ORIENTED CONTROL TO DOUBLE WINDING ASYNCHRONOUS MOTORS IN LARGE POWER INVERTER DRIVES
By M. Matuonto; E.Gatti; G.Torri; M. Frascotti; A. Monti; M. Riva [View]
[Download]

Abstract: The operation of inverter drives in applications requiring high overload capability imposes strong constraints to the electronic switching devices. The use of asynchronous motors with two stator windings, fed by two inverter modules, allows to reach large power rating in variable speed drives for high performance applications. This paper shows the structure and the main features of the field oriented control realised for a double winding motor, fed by two GTO inverters. The operational results of a 850 kW drive, working as a melt pump in a polyethylene plant are reported in order to describe the obtained performances.

   MODULATION AND CONTROL OF CURRENT SOURCE CONVERTERS FOR HIGH DYNAMIC PERFORMANCE OF INDUCTION MOTORS
By H. Zelaya de la Parra; I. J. Iglesias; O. Gonzalez; J. M. Solana; J. Tamarit [View]
[Download]

Abstract: This paper presents the analysis and design of a modulation and control strategy for a Current Source Inverter (CSI) driving an Induction Motor, where low harmonics and high dynamic perfonnance are the main targets. The modulation strategy described and tested, in simulation, is based on the optimal selection between the seven available current phasors of the inverter in the d-q plane. A rotor-flux oriented control of the induction motor is implemented by means of flux and speed control loops. The simulations carried out have shown good performance of this modulation technique for a high frequency range (600 Hz to 5 kHz), consequently it could be applied from medium to high (100 kW to 1MW) power applications.

   SYSTEM DESIGN OF AN INTEGRATED CONTROL UNIT FOR VARIABLE SPEED DRIVES
By W. A. G. de Jager; J. A. J. M. Geerligs; A. Duym [View]
[Download]

Abstract: Most variable speed drives for industrial applications consist of a supply-side and a motor-side converter. A new Integrated Control Unit (ICU) has been developed consisting of flexible control modules for different converter types and different power modules. These control modules are produced as autonomous units. The object of the development was to produce a configurable drive control system which is able to control various typed of variable speed drive applications.

   EXPERIMENTAL VALIDATION OF THE USE OF A DIRECT TORQUE FEEDING ALGORITHM IN AC DRIVES
By A. Bobbio; G. Bosia; M. L. Grassi; E. Pagano [View]
[Download]

Abstract: The paper presents the experimental validation of a feeding algorithm for field oriented controlled asynchronous motors. The algorithm is named "direct torque", because it implies a direct relation between reference torques and feeding voltages. The algorithm has been implemented on a control board and the control technique has been applied to an asynchronous motor driving a de electric dynamometer on a test bench. The paper shows theoretical and experimental results and validates the practical advantages envisaged for the use of the suggested feeding algorithm.

   EVALUATION OF SEVERAL SWITCHING TABLES USED IN VARIABLE STRUCTURE CONTROL OF HIGH POWER INDUCTION MOTOR DRIVES SUPPLIED WITH 3-LEVEL INVERTERS
By A.-M. Arcker-Hissel; M. Pietrzak-David; F. Ben Ammar; B. de Fornel [View]
[Download]

Abstract: The use of 3-Ievel inverters to supply high power induction motor drives in many industrial applications is advantageous. Then, the decrease of the switching frequency allows the use of very high power switches like GTOs .. Variable Structure Control, largely developed to control induction motors supplied with 2-Ievel inverters, achieves very fast torque responses. It consists of two separated control loops for stator flux and electromagnetic torque. The control is able to change directly the inverter state through an optimal commutation table. With the combination of Variable Structure Control and 3-Ievel inverter, it is possible to build more than one commutation table to control the induction motor. Through these tables, improved .simulation results are carried out with low switching frequency and fast torque response.

   A SLIP CONTROL STRATEGY OF CONSTANT-POWER IM DRIVES
By Z. J. Zhai; K. H. Oh; P. G. Im; D. J. Kim [View]
[Download]

Abstract: A slip control strategy of the induction motors(IM) has been proposed in the constant-power mode drives. It is originally discovered that constant-power drives can be realized by controlling the rotor slip of the induction motor, instead of the rotor slip speed, widely adopted in the traditional constant-torque control. A scalar-decoupled control scheme linearizes the control of the electromagnetic power by setting up a decoupling network in the stator in the constant-power operation. The simulation and experimental results are also shown in this paper.

EPE 1997 â€“ 69: Dialogue Session DS5k: CONTROL OF AC MACHINES: INDUSTRIAL APPLICATIONS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 â€“ 69: Dialogue Session DS5k: CONTROL OF AC MACHINES: INDUSTRIAL APPLICATIONS
	[return to parent folder]

	A MOTOR DRIVING CONTROLLER SUITABLE FOR ELEVATORS By N. Mutoh; N. Ohnuma; A. Omiya; S. Hokari; M. Konya; T. Mine	[View] [Download]
Abstract: An induction motor driving Â·COntroller which can improve perfonnance of ele~ators is. studi~d. The controller has three features. First, it has energy saving control by which the mductton motor stably generates the motor torque at the maximum efficiency, regardless of the number of passengers boarding the car, even if both acceleration from standstill and deceleration from steady state are done for any elevator. Second, it can suppress vertical vibrations of elevators while performing energy saving control. Third, it ensures good performance of elevators even when a source voltage is reduced due to an overload at the source sides. 'I11e controller is judged suitable for the drive system of elevators on the basis of simulations and experiments.

	VARIABLE STRUCTURE CONTROL FOR HIGH POWER INDUCTION MOTORS DRIVEN BY GTO INVERTER By F. Ben Ammar; H. Godfroid; J. F. Yhuel; S. Siala	[View] [Download]
Abstract: In this paper, the authors describe a high-power induction motor speed drive, fed by a voltage inverter using gate turuoff thyristors (GTOs). The Variable Structure Controller is designed in d-q plane. The stator flux (I)sd and the torque-producing current lsq, are controlled by mains of a hysteresis controllers. Under all operating conditions, the discontinuous multi-input control is selected to force the motion of the state system along the intersection of a two switching surfaces. Also, at constant switching frequency operation, the sampling-time is taken into account in the adjustement of hysteresis widths to the motor speed. Improved simulation results are obtained with low switching frequency and excellent torque controllability.

	APPLICATION OF FIELD ORIENTED CONTROL TO DOUBLE WINDING ASYNCHRONOUS MOTORS IN LARGE POWER INVERTER DRIVES By M. Matuonto; E.Gatti; G.Torri; M. Frascotti; A. Monti; M. Riva	[View] [Download]
Abstract: The operation of inverter drives in applications requiring high overload capability imposes strong constraints to the electronic switching devices. The use of asynchronous motors with two stator windings, fed by two inverter modules, allows to reach large power rating in variable speed drives for high performance applications. This paper shows the structure and the main features of the field oriented control realised for a double winding motor, fed by two GTO inverters. The operational results of a 850 kW drive, working as a melt pump in a polyethylene plant are reported in order to describe the obtained performances.

	MODULATION AND CONTROL OF CURRENT SOURCE CONVERTERS FOR HIGH DYNAMIC PERFORMANCE OF INDUCTION MOTORS By H. Zelaya de la Parra; I. J. Iglesias; O. Gonzalez; J. M. Solana; J. Tamarit	[View] [Download]
Abstract: This paper presents the analysis and design of a modulation and control strategy for a Current Source Inverter (CSI) driving an Induction Motor, where low harmonics and high dynamic perfonnance are the main targets. The modulation strategy described and tested, in simulation, is based on the optimal selection between the seven available current phasors of the inverter in the d-q plane. A rotor-flux oriented control of the induction motor is implemented by means of flux and speed control loops. The simulations carried out have shown good performance of this modulation technique for a high frequency range (600 Hz to 5 kHz), consequently it could be applied from medium to high (100 kW to 1MW) power applications.

	SYSTEM DESIGN OF AN INTEGRATED CONTROL UNIT FOR VARIABLE SPEED DRIVES By W. A. G. de Jager; J. A. J. M. Geerligs; A. Duym	[View] [Download]
Abstract: Most variable speed drives for industrial applications consist of a supply-side and a motor-side converter. A new Integrated Control Unit (ICU) has been developed consisting of flexible control modules for different converter types and different power modules. These control modules are produced as autonomous units. The object of the development was to produce a configurable drive control system which is able to control various typed of variable speed drive applications.

	EXPERIMENTAL VALIDATION OF THE USE OF A DIRECT TORQUE FEEDING ALGORITHM IN AC DRIVES By A. Bobbio; G. Bosia; M. L. Grassi; E. Pagano	[View] [Download]
Abstract: The paper presents the experimental validation of a feeding algorithm for field oriented controlled asynchronous motors. The algorithm is named "direct torque", because it implies a direct relation between reference torques and feeding voltages. The algorithm has been implemented on a control board and the control technique has been applied to an asynchronous motor driving a de electric dynamometer on a test bench. The paper shows theoretical and experimental results and validates the practical advantages envisaged for the use of the suggested feeding algorithm.

	EVALUATION OF SEVERAL SWITCHING TABLES USED IN VARIABLE STRUCTURE CONTROL OF HIGH POWER INDUCTION MOTOR DRIVES SUPPLIED WITH 3-LEVEL INVERTERS By A.-M. Arcker-Hissel; M. Pietrzak-David; F. Ben Ammar; B. de Fornel	[View] [Download]
Abstract: The use of 3-Ievel inverters to supply high power induction motor drives in many industrial applications is advantageous. Then, the decrease of the switching frequency allows the use of very high power switches like GTOs .. Variable Structure Control, largely developed to control induction motors supplied with 2-Ievel inverters, achieves very fast torque responses. It consists of two separated control loops for stator flux and electromagnetic torque. The control is able to change directly the inverter state through an optimal commutation table. With the combination of Variable Structure Control and 3-Ievel inverter, it is possible to build more than one commutation table to control the induction motor. Through these tables, improved .simulation results are carried out with low switching frequency and fast torque response.

	A SLIP CONTROL STRATEGY OF CONSTANT-POWER IM DRIVES By Z. J. Zhai; K. H. Oh; P. G. Im; D. J. Kim	[View] [Download]
Abstract: A slip control strategy of the induction motors(IM) has been proposed in the constant-power mode drives. It is originally discovered that constant-power drives can be realized by controlling the rotor slip of the induction motor, instead of the rotor slip speed, widely adopted in the traditional constant-torque control. A scalar-decoupled control scheme linearizes the control of the electromagnetic power by setting up a decoupling network in the stator in the constant-power operation. The simulation and experimental results are also shown in this paper.