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An application of a constrained adaptive lattice-structure allpass-based notch filter for advanced control of surface-mounted permanent-magnet synchronous drives

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5 Author(s)
Maric, D.S. ; Agilent Technol., Rockaway, NJ, USA ; Hiti, S. ; Stancu, C.C. ; Nagashima, J.M.
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A constrained adaptive lattice-structure allpass-based notch filter provides minimal phase delay and complete attenuation of the notch frequency. The allpass sections of the filter are realized as structurally lossless bounded real functions, with a minimum number of delay elements and multipliers. The filter structure admits orthogonal tuning of the notch frequency and notch bandwidth. An improved control scheme for surface-mounted permanent-magnet synchronous (SMPMS) drives ensures stable high-performance operation in the Bur weakening region, utilizing the over-modulation and six-step modes of the space vector modulation (SVM). An automatic transition into the flux weakening region is achieved by controlling the reference voltage magnitude. The fifth and seventh stator current harmonics of the fundamental frequency, generated in the over-modulation and six-step modes, propagate through the current control loops, resulting in the sixth harmonic in the reference voltage for the flux weakening loop and deteriorating drive performance. To properly filter the sixth harmonic over the extended speed range of the drive, the constrained adaptive lattice-structure allpass-based notch filter is employed

Published in:

Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on  (Volume:46 ,  Issue: 12 )

Date of Publication:

Dec 1999

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