HIGH-PERFORMANCE DIRECT-FREQUENCY CONVERTERS CONTROLLED BY PREDICTIVE-CURRENT LOOP

Two predictive space-vector control strategies for direct-frequency co nverter (DFC) structures are presented, Both algorithms require output -current feedback in order to decide the next best state of the conver ter, The performance of the control techniques is compared with a high -performance fictitious-link DFC, Computer simulation using Microsim P Spice 5.3 is used to examine the operation of the DFC converter algori thms. The evaluation is done for a wide-operational output frequency a nd includes input/output-voltage ratio, commutation frequency, input-c urrent balance, input-current total harmonic distortion (THD), and inp ut power factor, From these results, the high performance exhibited by the proposed algorithms is verified.