Improvement of modulation strategy for two-stage matrix converter under abnormal input voltages

The conventional space vector modulation can't reduce the influence imposed on the output of two-stage matrix converter (TSMC) by abnormal input voltages. To overcome this shortcoming, a new method is proposed to describe the abnormal input voltages, and a concept of anti-disturbance vector is introduced and added to the rectifier modulation vector to improve the output waveforms. In this paper, the principle of modified strategy is analyzed, and the output performance of TSMC with conventional strategy is compared with those with modified strategy by Matlab/Simulink. Analyses and simulation show that the proposed strategy is easily to implement and can effectively reduce the output harmonic components under abnormal input voltages. Therefore, the validity of the modified strategy is verfied.