Extended ride-through capability for matrix converter drives with continuous motor synchronization

To effectively ride through any voltage sag using a matrix converter adjustable speed drives requires a solution that exceeds conventional modulation techniques. Basically, the proposed strategy regulates the converter modulation index up to dynamic overmodulation if necessary, and secondly reduces the motor speed if the former action does not suffice. The key factor accomplished is to maintain full converter synchronization with the motor during the sag to provide immediate acceleration once the disturbance disappears. Further, a decision-making space vector modulation exhibiting minimum-processing load was developed to enhance the performance. The drive was experimentally verified under typical industry disturbances using a TMS320C32 DSP based system. Results obtained showed the effectiveness of the proposal for matrix converter adjustable speed drives.