Model Predictive Current Control in the Stationary Coordinate System for a Three-Phase Induction Motor Fed by a Two-Level Inverter

摘要

Model predictive current control (MPCC) has been a research hotspot due to its simple control structure in the motor control field. However, the MPCC based on field orientation in synchronous rotation coordinate system needs the synchronization angle calculation and field orientation, which leads to a series of park coordinate transformations. Besides, its actual control process is affected by the magnetic field orientation accuracy. In this paper, the MPCC based on a dual-boundary circle strategy in the two-phase stationary coordinate system is proposed, which can reduce the times of park coordinate transformation and results in a low computational burden. Compared with the single-boundary circle strategy, dual-boundary circle strategy can realize a better dynamic control performance and a lower current harmonic content of the motor system. Moreover, low switching frequency is also a critical performance target, especially in the high-power motor control system. So weighing factor is introduced to the cost function and is used to balance the control performance between switching frequency and current tracking. Based on the proper weighing factor and inner radius and outer radius of dual-boundary circle, the control performance of the strategy proposed is verified on the simulation platform of a 160kW induction motor control system.