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	The use of controlmodels at power electronic drives	[View]   [Download]
Author(s)	H. Mijnarends; W. Deleroi
Abstract	The TUD developed a good and userfriendly method of modelling of control systems called PSI. A major contribution has been delivered by P. P. J. van den Bosch. The system enables us to apply limiters and non-linear functions. The 4 described studies have been verified with a real model, the results show sometimes important differences with the litterature. Study 1: Speedcontrol with a 3-phase-bridge and a Dc-motor. The bridge-circuit has been used for motor and generator purpose. Parameters were: uninterrupted DC-current, interrupted DC-current, small and big commutation reactance. The original system showed damped oscillations as stepresponse-answer to the speedreference. The modified system has less than 5% overshoot and is much faster. Without limiter no satisfactory results were possible. The system consists of the well-known 2-loopsystem with an inner currentloop and an outer speedloop. Study 2: Speedcontrol of a currentinvertor with a squirrelcage inductionmotor. With a slightly modified circuit of study 1 we could build a good model of the current-invertor which showed less than 10% difference to the real system. The motorcurrent has been limited to 125% In; uninterrupted DC-current did not occur. The statorvoltage of the machine had been kept linear to the statorfrequency. So the motorinduction changes from motor to generatordrive; the downstep is faster.
Download	Filename: Unnamed file Filesize: 2.07 MB
Type	Members Only
Date	Last modified 2021-03-01 by System