基于并联逆变器的并联型功率因数校正技术研究

Study of Shunt PFC Technology Based on Shunt Inverter

提出了并联于电源与负载之间的并联型功率因数校正技术,采用倍频载波相移SPWM技术的并联逆变器作为主电路结构,降低功率器件的电流等级,提高逆变器的等效开关频率。从电源电压和逆变器直流侧电容电压提取电源电流的指令电流的相位和幅值信息,采用电压外环PI调节电流内环P调节实现电源电流与电源电压同频同相,控制算法简单,鲁棒性好。进行了仿真和实验验证,带线性及非线性负载时功率因数达到0.99,谐波畸变率低,结果证明了并联型PFC的正确性和有效性。

A shunt PFC technology which is shunted between the power supply and the load is proposed. Shunt inverter with frequency-doubling carrier phase shifted SPWM technique is used as the main circuit structure to reduce the device currents rate and switch stress and enhance the equivalent switch frequency. The phase angle of the source current reference is determined by the source voltage, while the magnitude of that is obtained from controlling the DC side capacitor voltage of the inverter. The PFC is realized by inner current loop P control and outer voltage loop PI control for its simple arithmetic, good robustness. The simulation and experimental results show that this system can achieve a high power factor of 0.99 and low total harmonic distortion under linear or nonlinear load. the validity and efficiency of the proposed shunt PFC technology are confirmed by the numerical results .