NDLI: Error analysis of calculating average d-q current components using regular sampling and Park transformation in FOC drives

Content Provider	IEEE Xplore Digital Library
Author	Jarzebowicz, L.
Copyright Year	2014
Description	Author affiliation: Fac. of Electr. & Control Eng., Gdansk Univ. of Technol., Gdansk, Poland (Jarzebowicz, L.)
Abstract	In electric drives using voltage source inverters, motor currents contain ripple component resulting from pulse-width modulated (PWM) voltage. The frequency range of the ripples is much higher than the bandwidth of current control. Therefore the control is performed on the basis of a fundamental current component, i.e. average value with the averaging time being the PWM period. In majority of cases the average current is measured without low-pass filtering, with the use of Regular Sampling method. The method enables extraction of the current fundamental component by sampling current instantaneous value once in a PWM period, synchronously with peaks or valleys of PWM carrier signal. Regular Sampling is widely used in industry in combination with field-oriented motor control algorithms. In such a case motor flux and torque are controlled by current components expressed in a rotating reference frame d-q. The feedback signals for current controllers are calculated on the basis of sampled motor phase currents, with the use of Clarke and Park transformations. However, transforming samples of average phase currents into the rotating reference frame does not result in exact values of average d- and q- current components. This influences motor torque and flux. The error reaches considerable values in high-speed drives operating at relatively low PWM frequency. The value of the error was derived analytically, followed by simulation verification.
Starting Page	901
Ending Page	905
File Size	1253822
Page Count	5
File Format	PDF
ISBN	9781479958498
DOI	10.1109/ICEPE.2014.6970042
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-10-16
Publisher Place	Romania
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Digital control Induction motors Torque Current measurement Torque control Signal sampling Pulse width modulation Variable speed drives Traction motors Synchronous motors
Content Type	Text
Resource Type	Article

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