Analysis and Mitigation of Dead-Time Harmonics in the Single-Phase Full-Bridge PWM Converter with Repetitive Controllers

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Abstrakt

In order to prevent the power switching devices (e.g., an insulated-gate bipolar transistor, IGBT) from shoot-through in voltage-source converters during a switching period, the dead time is added either in the hardware driver circuits of the IGBTs or implemented in software in pulse width modulation (PWM) schemes. Both solutions will contribute to a degradation of the injected current quality. As a consequence, the harmonics induced by the dead time (referred to as 'dead-time harmonics' hereafter) have to be compensated in order to achieve a satisfactory current quality, as required by standards. In this paper, the emission mechanism of dead-time harmonics in single-phase PWM inverters is, thus, presented considering the modulation schemes in detail. More importantly, a repetitive controller has been adopted to eliminate the dead-time effect in single-phase grid-connected PWM converters. The repetitive controller has been plugged into a proportional-resonant-based fundamental-frequency current controller so as to mitigate the dead-time harmonics and also to maintain the control of the fundamental-frequency grid current in terms of dynamics. Simulations and experiments are provided, which confirm that the repetitive controller can effectively compensate the dead-time harmonics and other low-order distortions, and also, it is a simple method without hardware modifications.

OriginalsprogEngelsk
Artikelnummer8337004
TidsskriftI E E E Transactions on Industry Applications
Vol/bind54
Udgave nummer5
Sider (fra-til)5343-5354
Antal sider12
ISSN0093-9994
DOI
StatusUdgivet - sep. 2018

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