An Improved Matrix Converter Fed Induction Motor Vector Control Drive with Output Voltage Error Cancellation

Output voltage error of matrix converter resulted from bi-directional switch commutation is one of the important issues which influence the drive system performance. In this paper, an improved matrix converter fed induction motor vector control drive is presented. The cause and influence of output voltage error due to four-step commutation in matrix converter are discussed deeply. In order to eliminate the output voltage error, a variable step length commutation method is proposed for the matrix converter fed induction motor drive. By using this method, the commutation process has been shortened and the output voltage distortion has been compensated. Hence, the output waveform quality of matrix converter and the drive performance of induction motor adjustable speed system are improved. In addition, the input waveform quality has also been enhanced due to the direct conversion characteristic of matrix converter. Experimental results demonstrate the effectiveness and advantages of the proposed approaches.