This article proposes predictive current control (PCC) using a four-dimensional finite control set (4D-FCS) based on the optimal operating time of vector for a seven-phase induction motor drive system. In this approach, the candidate vectors are remodelled into 4D-FCS considering the magnitude index, the angle index, the harmonic current plane index, and the variation trend index of a virtual vector as four dimensions. By taking advantage of the 4D-FCS, the proposed approach can significantly reduce the number of candidate vectors and take comprehensive consideration of 4D influence. Further, the virtual vector operating time replaces the voltage vector in the cost function, which is used to evaluate the action effect of vectors. This upgrade can guarantee the duty cycle properly function in PCC with duty cycle modulation. Finally, experiments verify the fast calculation viability and effectiveness of the proposed method.
In order to solve the problems of harmonic currents in the conventional vector control of mul tiphase induction motor, the rotor field oriented control (RFOC) strategy with harmonic current closed loop control is proposed in the paper. Based on the transform theory of the multiphase system and the RFOC strat egy of three phase induction motor, the mathematical modulation of RFOC for five phase induction motor is modeled. The fundamental current and the second order harmonic current can be controlled indepen dently after being decoupled. The proposed strategy is implemented with a board microcomputer that uses TMS320F28335 DSP. The experimental results show that the proposed RFOC strategy with harmonic cur rent closed loop control has outstanding dynamic and static performance.
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