《2.09_王旭东_级联双Buck逆变器的直直变换器输入电流低频纹波抑制_6》.pdf

航空电源航空科技重点实验室学术年会(APSC’ 2012)论文集 级联双 Buck 逆变器的直直变换器输入电流低频纹 波抑制 王旭东 张方华 肖旭 (南京航空航天大学，江苏 南京 210016) The Low Frequency Input Current Ripple Rejection of a DC-DC Converter with the Dual-Buck Inverter Load Wang Xudong, Zhang Fanghua, Xiao Xu (Nanjing University of Aeronautics Astronautics, Nanjing 210016, China) Abstract: The instantaneous output power of two-stage inverters 目前UPS 、光伏(PV) 、燃料电池(FC)、电动汽车 contains a two-octave pulse which frequency is twice of the output 等分布式发电系统中，为了获得负载所需115V或 voltage, the pulse power is reflected in the input current ripple; The 220V交流电，系统通常需要采用DC/DC+DC/AC 的两 pulse current influences the supply source and the converter 级式结构：前级DC/DC完成逆变器输入输出电压匹配 itself.This paper presents detailed analysis of the manifestations 及电气隔离；后级DC/AC完成直交转换并给终端负载 and transmission mechanisms of the two-octave pulse power of [1-2] which latter stage is a Dual-Buck converter, and proposes a new 供电 。 sampling way and introduces Notch filter in the control loop to 由于逆变器输出电压和电流都是低频交流电，因 reject current ripple for the latter stage is a Dual-Buck converter. 此逆变器瞬时功率中含有两倍频脉动量；不考虑逆变 Based on this, this paper also analyses quantificationally the effects 器瞬时功率转换时的损耗，那么前级直直变换器将呈 of different ripple rejection strategies, points the advantages of 现脉动功率特性，使得输入电流呈现低频脉动。该低 Notch filter compared with average current control in dynamic 频脉动电流对直流输入源产生较大的影响[3-4] ；如在 responses. Finally, these analysis are verified by experimental