用于飞机变频电网APF的补偿电流指令产生方法

摘要

针对飞机交流变频电网谐波抑制的需要及传统方法在变频条件下的不足,提出了一种基于正序基波滤波器的补偿电流指令产生方法.该方法从整体上分析了正序基波滤波器的特性,并利用正序基波滤波器分别滤除了电源电压和电流中的谐波和非正序成分,而后计算出电源的正序基波有功电流,由此得到补偿电流指令,检测过程中省去了低通滤波器.将该方法应用于三相电压不对称且有畸变的飞机变频电网的并联有源电力滤波器(APF)中,结果表明,采用该方法在整个基频变化范围内能实现对谐波、无功及不平衡电流准确而快速的检测和补偿,补偿结果符合MIL-STD-704F和IEEE Std 519标准的要求.%A new compensation current reference generation method based on positive sequence fundamental filter is proposed for suppressing harmonics of variable-frequency aircraft power system and remedying deficiency of traditional methods.At first,the harmonics and non-positive sequence components in voltage and current of power supply are removed by the filter according to its integral characteristics,then the positive sequence fundamental active current and needed compensation current reference are calculated without low pass filter.The proposed method is applied in APF of a variable-frequency aircraft electric power system under unbalanced and distorted PCC voltage conditions.The simulation results show that the proposed method can detect and compensate the harmonics,reactive and the imbalance current in entire frequency range accurately and rapidly.The compensation results meet standards MIL-STD-704F as well as IEEE Std 519.