Efficiency comparison of active and passive grid filter damping methods using direct matrix converter

In this paper two recent presented active grid current stabilisation strategies for direct matrix converter based drives with squirrel-cage asynchronous induction machines are compared with there passive counterparts. While the functionality of the active stabilisation strategies has been proven already this publication focuses on the harmonic distortion of grid and machine current as well as the efficiency of converter and machine. The purpose is to rate the performance of the active damping approaches. After a short introduction of the stabilisation strategies the experimental setup is described. Finally, several points of operation will be used to evaluate the strategies for long term use.