Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 69, Issue 1, Pages 110-120Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2021.3053880
Keywords
Switches; Harmonic analysis; Voltage control; Control systems; Cost function; Switching frequency; Torque; Deadbeat control; direct modulation pattern control (DMPC); dual three-phase; multiphase machine; permanent magnet synchronous motor (PMSM); predictive control; switching frequency; voltage vector
Categories
Funding
- Science Technology and Innovation Committee of Shenzhen Municipality, China [SGDX2019081623101559]
- Innovation and Technology Commission, Hong Kong [ITP/027/19AP]
- Strategic Research Grant [CityU11218519, CityU11217520]
- City University of Hong Kong, Hong Kong [ARG9667214]
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This article proposes a novel direct modulation pattern control method to achieve better suppression of additional harmonic currents and reduce switching frequency in multiphase permanent magnet synchronous motors. The method calculates reference voltage vectors using a deadbeat control concept and optimizes the influence of different switching patterns on xy currents.
The additional harmonic currents in multiphase permanent magnet synchronous motors (PMSMs) have been widely discussed and suppressed by the virtual vectors (VVs). However, the concept of VVs would result in an increasing in the switching frequency and losing the controllability in the harmonic subspace. In this article, a novel direct modulation pattern control (DMPC) method is proposed to provide the further discussion on the lower switching frequency and the better harmonic current suppression. First, a deadbeat control concept is applied to calculate the reference voltage vectors in torque production. In dual three-phase PMSM, there are several switching patterns which could generate the reference voltage vector. The designs of these switching patterns are determined according to the demand. In fact, two design concepts under the structure of DMPC is proposed. One is called the low switching frequency design. The control sets of this design is several switching patterns with only one switching signal. Another is called the low THD design. The control sets of this design is two switching patterns with opposite harmonic voltage vectors. Second, the influence of these different switching patterns in the xy currents is optimized by a cost function. Actually, there are two types of cost function. One is a multiobjective cost function, which is designed to regulate both the amplitude of switching patterns and suppress the xy currents. Another is derived from the first cost function that regulates only the xy currents. The amplitude is determined directly in the voltage vector calculation. Finally, the experimental results show a good performance of these control strategies, in terms of the alpha beta currents production, the xy currents and the switching frequency reduction.
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