单相PFC电流无差拍控制的研究

Study on the dead-beat current control of single-phase PFC

针对H桥型单相功率因数校正(PFC)系统,提出了一种加入"零矢量"调制的电流无差拍控制及变速积分PID调节算法。该方案实现了网侧单位功率因数正弦波电流控制,从而减少了网侧电流谐波,并且能量可双向传输。由于采用了变速PID调节算法,因而使单相PFC获得良好的动态特性。通过实验装置,验证了该方案的正确性。

The H-bridge single-phase Power Factor Corrector(PFC) is studied. The algorithm of dead-beat current control with the zero-vector is presented,and the proportional-integral-differential(PID) algorithm with the varying integrating rate is adopted in the design of the voltage regulator. The approximately sinusoidal current control of the unit power factor on the line side is realized,the harmonic current of the PFC eliminated, bi-directional power flow achieved,and the dynamic performance of the PFC improved. An experimental system is constructed and the results show the correctness of the scheme.