Analysis and Suppression of Current Harmonics in Grid Side of PWM Rectifiers during Light Load
Liu Bo, Ben Hongqi, Bai Yinlong, Sun Shaohua
1. School of Electrical Engineering and Automation Harbin Institute of Technology Harbin 150001 China; 2. College of Automation and Electronic Engineering Qingdao University of Science and Technology Qingdao 266042 China
Abstract Current harmonics in grid side of pulse width modulation (PWM) rectifiers are usually high during light load. Aiming at this phenomenon, causes of the harmonics are analyzed in detail. This paper points out that dead time effect, harmonics of drive signals and harmonics of the grid voltage are the main reasons that leads distortions in grid current, and the computing methods of the harmonics are given accordingly. Because the grid side current harmonics have complicated components and are difficult to be compensated accurately, a new method with adaptive cosine internal model controllers to suppress 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.
Liu Bo1,Ben Hongqi1,Bai Yinlong1等. Analysis and Suppression of Current Harmonics in Grid Side of PWM Rectifiers during Light Load[J]. Transactions of China Electrotechnical Society, 2016, 31(增刊): 162-168.
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2016, Vol. 31 
