Common-mode voltage suppression strategy of PMSM system using model predictive control
PWM common-mode voltage(CMV)interference directly threatens the safety and stability of inverter driven motor system.According to the freewheeling principle of the switch,a CMV suppression strategy was proposed for the permanent magnet synchronous motor(PMSM)system using model predic-tive control,which can control the dead time switch tube by using two methods:current sector determina-tion and switch function direct control,and the CMV amplitude was suppressed by changing the current freewheeling path.The simulation model was established,the CMV under the suppression strategy was simulated and analyzed,and the experimental platform was implemented for measurement.The simulation and experimental results show that the proposed strategy based on the two control methods can effectively suppress the CMV and decrease the number of switches in unit time and current harmonics.Among them,the suppression effect of switching function direct control method is more significant,which sup-press the maximum value of common mode voltage at Udc/6 at different speeds,and the number of swit-ches is reduced by about 5%compared to traditional methods.
PMSMinverterPWMCMV suppressionmodel predictive controldead band switch con-trol
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