航电系统中单相PFC变换器输入电流过零畸变的改善技术

The Technology for Improving Input Current Zero-Crossing Distortion of Single-Phase PFC Converters in Airborne Power System

中文关键词:  航空电网  过零畸变  电感大小  相位差  交错并联

英文关键词:airborne power system  zero-crossing distortion  value of inductor  phase displacement  paraller interleaving

中文摘要:

      在航空交流电网系统中，PFC(power factor correction)变换器输入电流在输入电压过零点附近会发生畸变现象。详细分析了输入电流过零畸变的原因，指出电感大小、输入电流与电压相位差是其主要因素，并通过仿真验证该理论分析的正确性。通过引入交错并联技术，可以减小电感量并等效提高开关频率，从而可以有效改善过零畸变。为此，设计实验验证该方法的有效性。实验结果表明过零畸变得到明显改善，电流谐波达到相关标准，可适用于航电系统。

英文摘要:

      In airborne AC power system,input current may distort at the vicinity of input voltage zero crossing in power factor correction (PFC) converter.The essential causes of the zero-crossing distortion is analyzed,and it is pointed out that the major causes are the value of inductor and the phase displacement between input current and input voltage,and the validity of the theoretical analysis is verified by simulation.By adopting parallel interleaving technique,the inductor can be decreased and the equivalent switching frequency can be increased,input current zero-crossing distortion can be improved effectively.The effectiveness of this method is verified by experiments,and the experiment results demonstrate that it can make input current harmonics meet relevant standards,so it can be applied to airborne system.