volume | PIER Journals

Abstract

The model predictive control (MPC) for quasi-Z source inverter (QZSI)-based permanent magnet synchronous motor (PMSM) system suffers from the problems of inductor current ripple, large motor stator current pulsation and system susceptibility to load torque disturbance. A QZSI composite voltage vector model predictive current control strategy with a novel sliding mode reaching law (CVVs-NSMRL-MPCC) is proposed. Firstly, a composite voltage vector - including one shoot-through, one zero, and two active voltage vectors - is applied to the QZSI during each sampling period, which can effectively reduce the QZSI inductor current ripple and three-phase current pulsation. And the design work for weighting coefficients in the cost function is simplified by calculating the inductor current at ST duty cycle using dead beat control. Furthermore, a sliding mode controller with a novel reaching law is designed for the motor speed loop. Based on it, the external load disturbances are feed-forward compensated to the output port of the controller by the disturbance observer, which reduces the PMSM speed loop pulsation during load torque disturbances and improves the system transient control performance. Finally, the practicality of the strategy proposed in this paper is verified by experiments.

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Dr. Yang Zhang

Dr. Yang Gao

Dr. Kun Cao

Mr. Ping Yang

Dr. Gao Tang

Dr. Bing Luo