Open AccessCurrent Decoupling Control for the Three-level PWM Rectifier with a Low Switching Frequency
Author(s) -
Qingqing Yuan,
Kun Xia
Publication year - 2015
Publication title -
journal of electrical engineering and technology/journal of electrical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.226
H-Index - 27
eISSN - 2093-7423
pISSN - 1975-0102
DOI - 10.5370/jeet.2015.10.1.280
Subject(s) - decoupling (probability) , pwm rectifier , pulse width modulation , total harmonic distortion , control theory (sociology) , matlab , harmonics , rectifier (neural networks) , voltage , computer science , voltage source , low frequency , harmonic , control (management) , electronic engineering , engineering , control engineering , physics , electrical engineering , telecommunications , stochastic neural network , artificial intelligence , machine learning , recurrent neural network , artificial neural network , quantum mechanics , operating system
Three-level PWM rectifiers applied in medium voltage applications usually operate at low switching frequency to keep the dynamic losses under permitted level. However, low switching frequency brings a heavy cross-coupling between the current components i d and i q with a poor dynamic system performance and a harmonic distortion in the grid-connecting current. To overcome these problems, a mathematical model based on complex variables of the three-level voltage source PWM rectifier is firstly established, and the reasons of above issues resulted from low switching frequency have been analyzed using modern control theory. Then, a novel control strategy suitable for the current decoupling control based on the complex variables for i d and i q is designed here. The comparisons between this kind of control strategy and the normal PI method have been carried out. MATLAB and experimental results are given in detail.