Analysis and accurate compensation of dead-time for three-phase DC/AC inverter
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摘要: 在现有无死区控制方法的基础上,提出一种新的死区补偿策略.分析了死区效应以及开关器件非理想特性使逆变器输出电压产生畸变的原因,通过修正原始驱动信号,抑制了开关器件非理想特性对逆变器的影响,实现了死区效应的精确补偿.同时,改进了电流方向检测电路,提高了电流方向在零点附近的检测精度.实验结果证实,所提补偿策略简单可行,与现有死区补偿方法相比,逆变器输出波形正弦度进一步提高,获得了更优的补偿效果.Abstract: A novel approach to compensate the dead-time effect based on the existing no-dead-time technique was presented. The reason of the inverter output voltage distortion was analyzed with the consideration of the dead-time and the non-ideal characteristics of the switching devices. The proposed method was implemented by adjusting the pulse width of the original driving signals to compensate the switching delay and voltage drop effect of the power devices, thus the effects were prevented from propagating into the ac-side. An improved current polarity detecting circuit with high precision was introduced to overcome the difficulties in current polarity detecting around the zero current crossing point. A more accurate output voltage synthesis was obtained with simple logic and flexible implementation, by applying this compensation strategy to a general purpose inverter system. Experimental results verify the effectiveness of the proposed method.
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Key words:
- voltage-source inverter /
- dead-time /
- harmonic distortion /
- current measurement
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