Sawtooth-Carrier-Based Pulsewidth Modulation Method for Quasi-Z-Source Inverter With Zero-Voltage-Switching Operation to Reduce Harmonic Distortion and Inductor Current Ripple

This article proposes a novel sawtooth-carrier based pulsewidth-modulation (SCPWM) method for quasi-Z-source inverter (qZSI) with the zero-voltage-switching (ZVS) operation to reduce the total harmonic distortion (THD) and inductor current ripple. The conventional variable-duty pulsewidth-modulation...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2021-02, Vol.68 (2), p.916-924
Main Authors: Yang, Hyoung-Kyu, Park, Jung-Wook
Format: Article
Language:English
Subjects:
Carrier frequencies
Efficiency
Electric potential
Harmonic distortion
inductor current ripple
Inductors
Inverters
Modulation
Pulse width modulation
pulsewidth-modulation (PWM)
quasi-Z-source inverter (qZSI)
Ripples
sawtooth-carrier
Switches
Switching
Switching loss
Total harmonic distortion
Voltage
Zero voltage switching
zero-voltage-switching (ZVS)
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Summary:This article proposes a novel sawtooth-carrier based pulsewidth-modulation (SCPWM) method for quasi-Z-source inverter (qZSI) with the zero-voltage-switching (ZVS) operation to reduce the total harmonic distortion (THD) and inductor current ripple. The conventional variable-duty pulsewidth-modulation (VDPWM) method has been being used for qZSIs because it causes the low switching loss. However, this method has the limitation not only to improve the THD of output current but also to reduce the size of inductor when it is applied to the qZSI. To figure it out, the proposed SCPWM method uses the sawtooth-carrier signal while keeping the benefit from the use of variable duty. In particular, the ZVS operation occurs whenever the edge of sawtooth-carrier signal is located in the time interval of shoot-through state. This allows to increase the carrier frequency of qZSI without any additional switching loss. Thus, both the THD of output current and the inductor current ripple can be reduced while keeping the high efficiency of system. The operating principle of the proposed SCPWM method is first explained in detail. Thereafter, its performance is mathematically analyzed and compared with that of conventional VDPWM method. Finally, its practical effectiveness is verified by the hardware experimental test.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2020.2967710