| EPE 1997 – 67: Dialogue Session DS5i: APPLICATIONS OF DTC | ||
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 | A BACKSTEPPING APPROACH TO CONTINUOUS TIME DIRECT TORQUE CONTROL
By Duco W. J. Pulle; Ian R. Petersen | |
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Abstract: This paper derives continuous time version of direct torque control (DTC)
for an induction motor. The approach taken is based on the backstepping technique of nonlinear control theory. This gives a systematic approach to deriving a state feedback DTC controller equation and leads to significant insights into this drive control
technique.
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| | DIRECT MEAN TORQUE CONTROL OF AN INDUCTION MOTOR
By E. Flach; R. Hoffmann; P. Mutschler | |
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Abstract: A new method to control flux and torque of an induction motor is presented. Direct Mean Torque Control (DMTC) combines the good dynamic performance of Direct Torque
Control (DTC) with the advantages of time equidistant control algorithms for digital implementation in signal processor based systems. Experimental results confirm the validity
of the control scheme.
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| | SALIENT POLE SYNCHRONOUS MOTOR EXCITATION CONTROL IN DIRECT FLUX LINKAGE CONTROL BASED DRIVES
By O. Pyrhönen; J. Kaukonen; J. Luukko; M. Niemela; J. Pyrhönen; Pekka Tiitinen; Janne Väänänen | |
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Abstract: The principle of the DFL-control for electrically excited synchronous machines is introduced briefly. Because the d- and q-axis stator current components are not controlled
directly in this method, the only way to affect the direct axis current balance is to control the excitation current. For that reason, excitation current control has a remarkable effect on the drive performance and stability. Here basic principles of the excitation in DFL-controlled synchronous machine drives are presented.
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| | PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVE BASED ON DIRECT FLUX LINKAGE CONTROL
By J. Luukko; J. Kaukonen; M. Niemela; O. Pyrhönen; J. Pyrhönen; P. Tiitinen; J. Väänänen | |
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Abstract: A new modulation method called Direkte Selbstregelung control (DSR) or direct flux linkage control (DFLC) allows high dynamic performance combined with simple control schemes. In this paper the DFLC-control and the principle of the DFLC-control for permanent magnet synchronous motors are introduced. In addition, methods of determining the motor parameters with .the aid of the DFLC are presented. Experimental results from laboratory tests are also presented.
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| | Start up Strategies for a Direct Torque Controlled Synchronous Machine
By M.R. Zolghadri; D. Diallo; D. Roye | |
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Abstract: Direct torque control can be used for synchronous machine drives as well as for asynchronous machine drives. To avoid the initial condition problem in flux estimation, some zero initial flux start up methods for synchronous machine are proposed. The effect of each
magnetizing method on the start up time, current transient and torque dynamic, while the inverter current is limited, is discussed.
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| | Direct Torque Control System for Synchronous Machine
By M.R. Zolghadri; D. Diallo; D. Roye | |
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Abstract: A new sensorless controller based on direct torque control, for a synchronous
machine is proposed. Using direct torque control, stator resistance is the only parameter of the machine which should be known. Rotor current can be controlled to optimize the operating
point of the machine. The use of reactive torque control simplifies the field current control loop. The outputs of the control system are the stator inverter and rotor chopper switching
commands.
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| | PERFORMANCE ANALYSIS OF A DTC CONTROL SCHEME FOR INDUCTION MOTOR IN THE LOW SPEED RANGE
By D. Casadei; G. Serra; A. Tani | |
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Abstract: In this paper a direct flux and torque control scheme for industrial application is analysed in order to emphasise the drive performance at standstill and in the low speed range.
The control strategy utilises the torque and rotor flux commands to determine the reference value of the stator flux. In order to improve the low speed performance a closed loop estimator
is employed to evaluate the rotor flux. The validity of the control scheme is verified by simulations and experimental tests of an induction motor drive system.
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