A Dead Time Compensation Method Based on Inverter Bridge Current Prediction
Deod-time effect in PWM technology is one of the important factors causing harmonics in inverters. Traditional pulse-based dead time compensation method needs to shift pulse phase according to the polarity of inverter bridge current. However, the digital controller has a certain delay. In addition,...
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| Format: | Article |
| Language: | zho |
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Editorial Office of Control and Information Technology
2019-01-01
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| Series: | Kongzhi Yu Xinxi Jishu |
| Subjects: | |
| Online Access: | http://ctet.csrzic.com/thesisDetails#10.13889/j.issn.2096-5427.2019.05.010 |
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| Summary: | Deod-time effect in PWM technology is one of the important factors causing harmonics in inverters. Traditional pulse-based dead time compensation method needs to shift pulse phase according to the polarity of inverter bridge current. However, the digital controller has a certain delay. In addition, when the inverter operates in a low frequency with small current, inverter bridge current may have multiple zero crossings in one switching cycle. These factors make it difficult to determine the zero crossings of the inverter bridge current and may result in the false dead time compensation. This article analyzed the mechanism of dead time effect and its influences on the output voltage and current. Then, a dead time compensation method based on inverter bridge current prediction was proposed. The inverter bridge current is iteratively calculated throughout the switching cycle. Combined with the traditional dead time compensation method, dead time compensation is achieved. Simulink simulation results verify that the proposed method can reduce the harmonics caused by dead time effectively. |
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| ISSN: | 2096-5427 |