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In PWM inverter fed induction motor system, with the increase of the switching frequency, the negative effects on the motor and the electromagnetic compatibility problem to the peripheral equipment produced by the common-mode voltage have been focused. This paper presents a three-phase four-leg topology, and adopts NZPWM control strategy to suppress common-mode voltage, at the same time, this paper...
Due to the asymmetry of the structure, the traditional three-phase three-leg inverters produce huge amount of common-mode (CM) voltage and CM current. This paper introduces the theory of reducing CM interferences by using the three-phase four-leg structure and the SPWM control strategy of carrier phase shifting which is applied on the purpose of balance in inverters. The SPWM modulation index in this...
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