Abstract
This article examines the influence of the pulse-width modulation technique on the total harmonic distortion of electric motor currents for an aviation synchronous electric drive with excitation from permanent magnets. The feature of the aircraft traction drive is the high frequency of the first harmonic of the electric motor current. This is due to the fact that aircraft engines require high rotation speeds to provide the necessary torque for flight. In addition, to minimize the motor current at the required torque, electric motor designers design electric motors with a large number of pole pairs, which leads to a small ratio of the PWM frequency to the first harmonic frequency of the current. The study is aimed at finding the optimal PWM technique in terms of nonlinear distortion coefficient of the motor current and losses in the inverter using a mathematical model of the electric drive. CPWM, DPWM and NCDPWM are considered. The influence of the applied PWM technique on torque ripple is also considered. A two-level three-phase inverter based on SiC MOSFET is used as an autonomous voltage inverter. An inverter based on SiC MOSFET has higher power density as compared to inverters based on Si IGBT, which is important for the application in question. The simulation results showed that the NCDPWM technique makes it possible to obtain the lowest THDi, provided that the switching losses are equal for all PWM technique under consideration.
Keywords
pulse-width modulation, total harmonic distortion, voltage source inverter, permanent magnet synchronous motor, SiCMOSFET
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