Space vector modulated matrix converter under abnormal input voltage conditions

Abstract

An improved space vector modulation (SVM) approach for matrix converter (MC) operation in unbalanced and non-sinusoidal input voltage condition was presented. The concept of modulation vector was introduced, and the relationship of output voltage and input voltage of MC by space vector denotation was deduced. Using the modulation vector approach, an improved SVM approach was proposed to improve the output performance of MC in abnormal input voltage conditions. The novel approach was based on dynamic control of the output voltage modulation vector respect to the instantaneous input voltage vector. By this method, the unbalanced and non-sinusoidal input voltages could be automatically compensated without any extra calculation so the output voltage could keep balanced and sinusoidal in expected value. The validity of the improved SVM approach was verified by simulation and experiments.