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The performance of model predictive control mainly depends on the accuracy of model and parameters, such as the back electromotive force (EMF) harmonics in dual three-phase permanent magnet synchronous motors (PMSMs). However, the back EMF harmonics would vary with the operation conditions. Thus, the parameter mismatches in the harmonic subspace would be inevitable. In this article, a direct harmonic current control scheme is proposed to provide further harmonic current suppression under parameter mismatches in thexysubspace. First, deadbeat control concept is applied to calculate the reference voltage in theαβsubspace. This reference voltage vector is utilized to generate a group of control sets with different voltage vectors in thexysubspace. Then, a slide mode control scheme is provided to deal with the inaccurate parameters in thexysubspace. The reference voltage vector in thexysubspace is obtained with this slide mode control scheme without the remaining inductance parameters. Third, a two-step modulation method and cost function are discussed to further suppress the harmonic currents. The control sets generated by deadbeat control are optimized with the cost function. Moreover, a switching pattern with fixed switching frequency is proposed in this section. Finally, experimental results verify that proposed control scheme could further suppress the harmonic currents.
Liu et al. (Wed,) studied this question.
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