摘要
分析了VIENNA整流器在低载波比应用中因电感压降不可忽略导致输入电流在过零点处发生畸变的原因,提出了一种使用输入电流辅助判断SVPWM大扇区的调制策略,以消除输入电流的过零畸变,降低输入电流的THD值;并针对实际工程应用中输入电流采样易受干扰的问题,提出一种软硬件相结合的滤波方法以提高扇区判断的精度。进一步,根据SVPWM电压利用率与调制比的关系,分析了输入电流辅助判断SVPWM大扇区方法的适用条件,得到使用该方法的输出电压边界条件。最后,使用Matlab搭建了该整流器的仿真模型,并制作了1台1.5 kW VIENNA整流器实验样机,仿真与实验均验证了所提出的改进型SVPWM调制方法的可行性,能有效消除输入电流的过零畸变。
After analyzing the reason of input current distortion at a zero-crossing point caused by the inductance voltage drop in a VIENNA rectifier in low carrier ratio applications,a modulation strategy of using input current to judge the large sector of space vector pulse width modulation(SVPWM)is proposed to eliminate the zero-crossing distortion of input current,thereby effectively reducing the total harmonic distortion(THD)value of input current.Aimed at the problem that the input current sampling is vulnerable to disturbances in practical engineering applications,a filtering method is put forward with the combination of hardware and software in order to improve the sector judgement accuracy.Furthermore,according to the relation between voltage utilization ratio of SVPWM and the corresponding modulation ratio,the appropriate conditions for the input current aided judgment method for the large sector of SVPWM are analyzed,and the output voltage boundary conditions are obtained using this method.Finally,a simulation model of the rectifier was built using Matlab,and an experimental prototype of 1.5 kW VIENNA rectifier was fabricated.Simulation and experimental results verified the feasibility of the improved SVPWM modulation method,which can effectively eliminate the zero-crossing distortion of input current.
作者
汪洋
吴越
杨青松
石健将
WANG Yang;WU Yue;YANG Qingsong;SHI Jianjiang(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)
出处
《电源学报》
CSCD
北大核心
2020年第5期101-109,共9页
Journal of Power Supply
