A Dual-Level Hysteresis Current Control for One Five-Leg VSI to Control Two PMSMs

A dual-level hysteresis current control (DHCC) is proposed for the five-leg drive system, in which two same three-phase permanent-magnet synchronous machines (PMSMs) are controlled by one five-leg voltage-source inverter. To overcome the coupling of the two PMSMs, the master-slave selection principle is introduced. The coupling phase with the larger absolute value of the phase current error is determined as the master coupling phase and the leg-switch-state of the common leg is set as the phase-switch-state of the master coupling phase. On the other hand, the phase-switch-states of four individual phases are directly assigned to the four individual legs, respectively. The executing process of DHCC does not require any machine parameters, which enhances the system robustness. The effectiveness of DHCC is verified by experimental results.