Novel Scalar PWM algorithm for Four-Level Asymmetrical Dual Inverter Fed Induction Motor Drive
نویسندگان
چکیده
This paper presents a novel scalar based pulse width modulation (PWM) algorithm for four-level asymmetrical dual inverter fed induction motor drive. In the conventional carrier based PWM algorithms for dual inverter fed induction motor drive, both inverters will be operated at all modulation indices. But, the proposed PWM algorithm operates only one inverter at lower modulation indices and other inverter will be clamped to the dc bus. Hence, the proposed PWM algorithm results in reduced switching losses at lower modulation indices. At modulation index between the range 0.33 to 0.66, the proposed algorithm will operate both inverters such that the common mode voltage will be reduced. At higher modulation indices (>0.666), the proposed algorithm results in same common mode voltage when compared with the conventional algorithm. To validate the proposed algorithm, the numerical simulation studies have been carried out and results are presented and compared. Keywords–Dual inverter, induction motor, SVPWM
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