摘要
PWM整流器在轻载时网侧电流总谐波畸变率通常较高。针对这一现象,详细分析其网侧电流谐波的产生机理,指出死区效应、驱动信号谐波和电网电压谐波是导致网侧电流畸变的主要因素,并给出相应的谐波计算方法。针对网侧电流谐波成因复杂、很难准确补偿的特点,提出一种抑制网侧电流谐波的自适应余弦内模控制方法,有效抑制了5、7、11、13、17、19等特征次谐波,并使其对系统稳定性的影响得到有效降低。实验结果验证了理论分析的正确性和控制方法的有效性。
Current harmonics in grid side of pulse width modulation (PWM) rectifiers are usuallyhigh during light load. Aiming at this phenomenon, causes of the harmonics are analyzed in detail. Thispaper points out that dead time effect, harmonics of drive signals and harmonics of the grid voltage arethe main reasons that leads distortions in grid current, and the computing methods of the harmonics aregiven accordingly. Because the grid side current harmonics have complicated components and aredifficult to be compensated accurately, a new method with adaptive cosine internal model controllers tosuppress grid side current harmonics is proposed. Then the low order harmonics (5th, 7th, 11th, 13th,17th and 19th) are suppressed effectively, and the influence on stability of the system decreases. Finally,simulations and experiments verify the correctness of analysis and rationality of control method.
作者
刘博
贲洪奇
白银龙
孙绍华
Liu Bo;Ben Hongqi;Bai Yinlong;Sun Shaohua(School of Electrical Engineering and Automation Harbin Institute of Technology Harbin 150001 China;College of Automation and Electronic Engineering Qingdao University of Science and Technology Qingdao 266042 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2016年第A01期162-168,共7页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(51377036)
关键词
PWM整流器
谐波分析
余弦内模
轻载
网侧电流
谐波抑制
PWM rectifier
harmonics analysis
cosine internal model
light load
grid side current
harmonics suppression
