Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 69, Issue 9, Pages 8760-8769Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2021.3116554
Keywords
Reluctance machines; Mathematical models; Inductance; Current control; Computational modeling; Voltage control; Estimation; Current control; digital sliding-mode control (DSMC); electric drives; pulsewidth modulation (PWM) current control; switched reluctance machines (SRMs)
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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This article introduces a digital sliding mode based robust model-free pulsewidth mode current control method for switched reluctance machine (SRM) drives. The proposed controller eliminates the need for phase inductance or flux-linkage identification, achieving efficient computational performance with accurate tracking of the reference phase current profile.
This article presents a digital sliding mode based robust model-free pulsewidth mode current control method for switched reluctance machine (SRM) drives. The model-free nature of the proposed controller allows complete elimination of the phase inductance or flux-linkage identification process. From the controller point of view, this exclusion yields excellent computational efficiency and low memory usage. In the proposed control method, the model information required to achieve a consistent closed-loop dynamic response is treated as an extended state and it is estimated online via unit time-step delayed approximation. The effect of this delay becomes significant as the operating speed increases. The estimation accuracy of the extended state is also affected by the noise in the current measurement. The effect of these factors on the control performance is compensated by using an auxiliary control action derived from a Lyapunov energy function analysis in the discrete-time domain. The resultant controller achieves accurate tracking of the reference phase current profile at fixed switching frequency modulation. It demonstrates a robust tracking performance throughout the controllable operating range of the SRM drive amid low signal-to-noise ratio.
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