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Scalar PWM algorithms for four-switch three-phase inverters

Scalar PWM algorithms for four-switch three-phase inverters

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Four-switch three-phase inverters (FSTPIs) have been proposed to be used in low-cost applications because of the reduced number of semiconductor devices, and space vector pulse width modulation (SVPWM) techniques have also been introduced to control FSTPIs. However, high-performance controllers are needed to implement complicated SVPWM algorithms, which limits their low-cost applications. To simplify algorithms and reduce the cost of implementation, an equivalent scalar method for SVPWM of FSTPIs is proposed. SVPWM for FSTPIs is actually a sine PWM by modulating two sine waves of 60° phase difference with a triangle wave, so such a special sine PWM can be used to control FSTPIs. The simulation and experimental results demonstrate the validity of the proposed method.

References

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      • M.B.R. Corrêa , C.B. Jacobina , E.R.C. Silva , A.M.N. Lima . A general PWM strategy for four-switch three-phase inverters. IEEE Trans. Power Electron. , 6 , 1618 - 1627
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      • G.A. Covic , G.L. Peters . DC link imbalance compensation in four-switch inverter AC motor drives. Electron. Lett. , 13 , 1101 - 1102
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      • Sun, D., He, Z.Y., He, Y.K.: `Four-switch inverter fed PMSM DTC with SVM approach for fault tolerant operation', IEEE Int. Electric Machines and Drives (IEMDC’07) Conf., May 2007, Antalya, Turkey, p. 295–299.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2010.0612
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