Improved low-common-mode-voltage dual-three-phase motor model predictive current control method

The invention provides an improved low-common-mode-voltage dual three-phase motor model predictive current control method, and relates to the technical field of multi-phase motor control. According to the method, two virtual voltage vectors, namely a method 1 and a method 2, are constructed respectively. The method 1 can realize that the CMV at the node is unchanged in a control period, and the method 2 can reduce the occurrence of overlarge voltage at the motor end. And 12 equivalent zero vectors capable of reducing the phase voltage change rate and low common-mode voltage are synthesized. According to the invention, the harmonic current and the common-mode voltage are reduced, and the copper loss of the motor stator and the generation of the shaft current are effectively reduced. Compared with the existing model prediction current control of low common mode voltage, the current quality is improved, the weight coefficient of the harmonic current item is eliminated, and the calculation burden of the controlle